HDTenEightyP/NetNews huggingface dataset:
From: nhaldar@magnus.acs.ohio-state.edu (Neil A Haldar)
Newsgroups: sci.materials
Subject: shape-memory alloys - acquisition help
Date: 31 Jul 92 14:54:10 GMT
Organization: The Ohio State University
X-Mailer: ELM [version 2.3 PL11]


Greets all!

I am interested in obtaining information and samples of various shape-memory 
alloys for a project I am currently working on.  I've read a number of 
publishings concerning nichrome wire, but am uncertain how to go about 
obtaining the real stuff.

If _anyone_ can point me towards:

* an ftp-able server where sci.materials-related papers/publishings/abstracts 
are kept...

* a mail-order company that can provide shape-memory alloys

* a reference book/paper/article that gives data for thermal and or electrical 
linear expansion coefficients

I would _truly_ appreciate it. :)

I am not a regular reader of this newsgroup, so any help, responses, or flames 
should be sent to:

nhaldar@magnus.acs.ohio-state.edu
*or*
neilh@well.sf.ca.us

No preference is given for whichever email address you want. :)

Again, thanks for the help, guys. :)

-Neil Haldar
614.299.8529
From: whit@milton.u.washington.edu (John Whitmore)
Newsgroups: sci.materials
Subject: Re: Insulator with good heat conductivity
Date: 29 Jul 92 04:38:01 GMT
Distribution: na
Organization: University of Washington, Seattle

In article <7926@dirac.physics.purdue.edu> parks@gibbs.physics.purdue.edu (Chris Parks) writes:

>What is a good material (good=price + availability) which is
>an electrical insulator and a good conductor of heat?

	If your electricity is in superconductors, 'insulator' is a fair
description of copper...

>It will be used at temperatures as low as 4.2 Kelvin and it needs
>to hold up to about 200 volts / mm, heat conductivity needs to
>be comparable to copper.  Does it exist?

	Your best bet is diamond, but you've already ruled that 
out (why, I can't imagine...).  Do you honestly want comparable
heat conductivity at 4.2K to the conductivity of copper at 4.2K?
Thermal conductivity of Cu is about 4W/cm/K at room temperature,
but 113W/cm/K at helium temperature.  Except for diamond, your
best bet is BeO (highly toxic, by the way!) but the only data I have
is for higher temperatures (125 BTU-in/hr/sq. ft/F).

	John Whitmore
From: kludge@grissom.larc.nasa.gov ( Scott Dorsey)
Subject: Re: Insulator with good heat conductivity
Organization: NASA Langley Research Center and Reptile Farm
Date: Tue, 28 Jul 1992 15:45:35 GMT

In article <7926@dirac.physics.purdue.edu> parks@gibbs.physics.purdue.edu (Chris Parks) writes:
>
>What is a good material (good=price + availability) which is
>an electrical insulator and a good conductor of heat?
>
>It will be used at temperatures as low as 4.2 Kelvin and it needs
>to hold up to about 200 volts / mm, heat conductivity needs to
>be comparable to copper.  Does it exist?

If it weren't for the low temperature requirement, I would recommend some
of the silicone compounds, which are very good heat conductors.  Mica is
right out.  Are there any silicones that are useful at temperatures that
low?
--scott
From: stanb@hpnmdla.sr.hp.com (Stan Bischof)
Newsgroups: sci.materials
Subject: Re: Insulator with good heat conductivity
Date: 28 Jul 92 22:51:11 GMT
Organization: Hewlett-Packard, Santa Rosa, CA

In sci.materials, parks@gibbs.physics.purdue.edu (Chris Parks) writes:


>What is a good material (good=price + availability) which is
>an electrical insulator and a good conductor of heat?

>It will be used at temperatures as low as 4.2 Kelvin and it needs
>to hold up to about 200 volts / mm, heat conductivity needs to
>be comparable to copper.  Does it exist?

>Note: Diamond may be ideal but not practical!

>Chris Parks
>parks@physics.purdue.edu

Don't know about conditions at cryogenic temperatures, but assuming that
the heat conductivity is not that far from what it is at room temp
then ceramics such as aluminum nitride and beryllium oxide have very
respectable heat transfer. Certainly almost any insulator will be much 
better than 200 V/mm, so that part is easy.

If you can deal with much less thermal conductivity then you could consider
common alumina (~1/5 thermal cond of copper) or sapphire.

Too bad you can't use diamond.

Stay away from plastics and glasses and rubbers and the like- all are
very poor conductors.

I would suggest a very thin layer of good thermally conductive insulator
then a metal for the bulk of the application. This is standard in
the electronics industry, with one common and cheap solution being
anodized aluminum. This would have one major advantage in that aluminum
IS very good structurally at cryogenic temps.

Stan Bischof
SRSD
Newsgroups: sci.materials
From: drabik@eecom.gatech.edu (Timothy J. Drabik)
Subject: Solvent for PVDF
Organization: School of Electrical Engineering, Georgia Institute of Technology
Date: Thu, 30 Jul 1992 17:09:03 GMT

I'm looking for a solvent for polyvinylidene flouride.
I would like to spin-deposit it.  Can anyone recommend
a journal reference or a chemical?

		Tim Drabik
		drabik@solaris.gatech.edu


--
From: ppp+@pitt.edu (Pradeep P Phule)
Newsgroups: sci.materials
Subject: Gradute student assistantships
Date: 24 Jul 92 18:41:17 GMT
Organization: University of Pittsburgh


	GRADUATE STUDENT ASSISTANTSHIPS AVAILABLE


	Opportunities exist for students with background
	in either (A) Materials Chemsirty or (B)
	Charcterization, structure-properties of
	ceramic materials using electron microscopy.

	Strong academic record is necessary. If your
	background is in either Chemistry (i.e
	inorganic or organic) or in traditional
	materials science of ceramics for 
	electronics, that will be an asset.
	Industrial experience in any of
	these areas may also be valuable.

	Please respond by e-mail or write to
	
	Professor Pradeep P. Phule
	Department of Materials Science
	University of Pittsburgh
	Pittsburgh, Pa 15261
From: FQV@psuvm.psu.edu (jim bowers)
Newsgroups: sci.materials
Subject: Re: Insulator with good heat conductivity
Date: 28 Jul 92 02:27:31 GMT
Distribution: na
Organization: Penn State University

thermal conductivity can vary quite a bit with temperature (things
generaly become much more conductive at lower temperatures).

I'm not sure there has been much research done on the thermal conductivity
of materials at very low temp.

                          Jim Bowers
Newsgroups: sci.materials
From: martinn@mksol.dseg.ti.com (niels r martin)
Subject: SOLDER SPEC DOWNLOAD SITE??
Organization: Texas Instruments, Inc
Date: Fri, 31 Jul 1992 17:40:29 GMT

I would like to find a site from which I can download text versions of solderingspecs such as MIL-STD-2000, MIL-STD-2000A, MIL_STD-454, etc.  If anyone has any info on where I could find these files, it would be appreciated.

-- 
________________________________________________________________________________Niels Martin				|                      
martinn@mksol.dseg.ti.com		|  AGM-88  Get out of HARM's way!!
My opinions don't represent		|  10,000+ on-time deliveries!
my employer's--but they're right!	|  Best Radar 'Detector' Around!   
Newsgroups: sci.materials
From: sjmetz@csd4.csd.uwm.edu (Steven J Metz)
Subject: Cast iron solidification modeling programs...  HELP!
Originator: sjmetz@csd4.csd.uwm.edu
Organization: Computing Services Division, University of Wisconsin - Milwaukee
Date: Fri, 31 Jul 1992 03:43:02 GMT



I am wondering if anyone could provide me with the names of any good
solidification modeling programs that are out there.  Several of the 
requirements that the software should posess are the following:
	1)  The ability to take gravitational forces into play.
	2)  The ability to import 3-D solid models from AutoCad.
	3)  Fill rate variations, (fast or slow pour).
	4)  Riser sizing ability.

If you would like, you can mail me the info to my account.


Thanks in advance,

Steve Metz
sjmetz@csd4.csd.uwm.edu
From: jaco@ccwf.cc.utexas.edu (John T. Fourkas)
Newsgroups: sci.materials
Subject: Glass transition of 3-n-butyl-pyridine
Date: 29 Jul 92 20:56:16 GMT
Reply-To: jaco@ccwf.cc.utexas.edu (John T. Fourkas)
Organization: Dept. of Chemistry, University of Texas at Austin
Originator: jaco@doc.cc.utexas.edu


     I have just discovered that 3-n-butyl-pyridine forms a glass
somewhere between 125 K and 150 K.  I have been unable to find any
reference giving a value for Tg or even admitting that it forms a glass
(I guessed that it would because butyl benzene does) after searching
through twenty years of Chem Abstracts plus a few other sources.  Does
anyone out there have a reference giving Tg for this stuff?  Barring
that, does anyone know where I could send a sample to have DSC done
on it?  Thanks.

__________________________________________________________________________
John Fourkas                             jaco@ccwf.cc.utexas.edu
Department of Chemistry                  spike@d31mf0.stanford.edu
University of Texas at Austin            jaco@leland.stanford.edu
Newsgroups: sci.materials
From: snyder@henry.ece.cmu.edu (John Snyder)
Subject: Re: Insulator with good heat conductivity
Organization: Physics Department, Carnegie Mellon University
Distribution: na
Date: Tue, 28 Jul 1992 08:05:14 GMT

In article <92209.222732FQV@psuvm.psu.edu> FQV@psuvm.psu.edu (jim bowers) writes:
>thermal conductivity can vary quite a bit with temperature (things
>generaly become much more conductive at lower temperatures).
>
>I'm not sure there has been much research done on the thermal conductivity
>of materials at very low temp.
>
>                          Jim Bowers


Actually, you would be surprised:  quite a bit of research has been done on
thermal conductivity of materials at very low temperatures.  Unfortunately,
what people building equipment for cryogenic research are looking for
is usually materials with *LOW* thermal conductivity, not high conductivity.
However, tables exist of the thermal conductivities of many common materials
at cryogenic temperatures.  I had a paper here somewhere a few years ago,
I'll see if I can find the reference.

John
snyder@henry.ece.cmu.edu
From: parks@gibbs.physics.purdue.edu (Chris Parks)
Newsgroups: sci.materials
Subject: Insulator with good heat conductivity
Date: 27 Jul 92 22:01:10 GMT
Distribution: na
Organization: Purdue University Physics Department


What is a good material (good=price + availability) which is
an electrical insulator and a good conductor of heat?

It will be used at temperatures as low as 4.2 Kelvin and it needs
to hold up to about 200 volts / mm, heat conductivity needs to
be comparable to copper.  Does it exist?

Note: Diamond may be ideal but not practical!

Chris Parks
parks@physics.purdue.edu
From: ornitz@kodak.kodak.com (Barry Ornitz)
Newsgroups: sci.materials
Subject: Re: Solvent for PVDF
Keywords: PVDF, polyvinylidene difluoride
Date: 31 Jul 92 17:53:32 GMT
Followup-To: sci.materials
Organization: Eastman Kodak Company, Eastman Chemical Company Research Labs

In article <1992Jul30.170903.12107@ee.gatech.edu> drabik@eecom.gatech.edu 
(Timothy J. Drabik) writes:
>I'm looking for a solvent for polyvinylidene flouride.
>I would like to spin-deposit it.  Can anyone recommend
>a journal reference or a chemical?

PVDF is used extensively in the chemical industry because of its chemical
resistance to most materials.  In fact, it is used as a replacement for PTFE
(Teflon) in many applications because of superior mechanical properties with
only a slight decrease in chemical resistance.  Finding a solvent for 
polyvinylidene difluoride will be very difficult.

Having said this, however, I will add that one of our commercial high boiling
point solvents, Ektasolve EEP, has been known to attack PVDF.  In our
manufacturing process for EEP, Kynar (PVDF) coated pH probes were dissolved
away completely as were Kynar insulated electrical conductivity probes.  I
am not sure this solvent will meet your needs however.

Why do most net posters always mistakenly spell fluorine containing compounds
as if they were bakery products?   ;-)
						Barry
 -----------------
|  ___  ________  |       Dr. Barry L. Ornitz          WA4VZQ
| |  / /        | |       Eastman Kodak Company
| | / /         | |       Eastman Chemical Company Research Laboratories
| |< < K O D A K| |       Process Instrumentation Research Laboratory
| | \ \         | |       P. O. Box 1972, Building 167B
| |__\ \________| |       Kingsport, TN  37662       615/229-4904
|                 |       INTERNET:   ornitz@kodak.com
 -----------------
From: whit@milton.u.washington.edu (John Whitmore)
Newsgroups: sci.materials
Subject: Re: Insulator with good heat conductivity
Date: 30 Jul 92 00:37:24 GMT
Organization: University of Washington, Seattle

In article <17760004@hpnmdla.sr.hp.com> stanb@hpnmdla.sr.hp.com (Stan Bischof) writes:
>In sci.materials, whit@milton.u.washington.edu (John Whitmore) writes:

>>best bet is BeO (highly toxic, by the way!)

>Nonsense. This is pure urban legend. You could eat BeO on your breakfast
>cereal and have no problems.

>The only problems with BeO come in when you powder it very finely and 
>inhale it into your lungs. The small particles cause some nasty reactions
>similar to what happens with inhaled asbestos. Basically a mechanical
>irritation. 

	Are you certain of that?  My trusty TLV-TWA table shows acceptable 
dust levels of arsenic at 0.5 mg/m^3, and of beryllium at 0.002 mg/m^3;
beryllium is a very toxic light-metal poison, and I always thought
the oxide was just as toxic.

	John Whitmore
From: nagle@netcom.com (John Nagle)
Subject: Re: Building Demolition Technology??
Date: Fri, 24 Jul 92 06:04:17 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 

endacott@kuhub.cc.ukans.edu writes:

>Our Director of Support Services poses an interesting question.  I
>would appreciate any information related to improved technology for
>building demolition or leads to any research in process dedicated to
>this subject. I will summarize any direct mail back to the list.

       Controlled Demolition, Inc. is the leader in explosive demolition
of buildings.  They don't "blow up" buildings; they use explosives to
cut structural members in sequence so that the building collapses in a 
predictable way.  

					John Nagle
From: stanb@hpnmdla.sr.hp.com (Stan Bischof)
Date: Thu, 30 Jul 1992 14:41:12 GMT
Subject: Re: Insulator with good heat conductivity
Organization: Hewlett-Packard, Santa Rosa, CA
Newsgroups: sci.materials

In sci.materials, whit@milton.u.washington.edu (John Whitmore) writes:


>>The only problems with BeO come in when you powder it very finely and 
>>inhale it into your lungs. The small particles cause some nasty reactions
>>similar to what happens with inhaled asbestos. Basically a mechanical
>>irritation. 

>	Are you certain of that?  My trusty TLV-TWA table shows acceptable 
>dust levels of arsenic at 0.5 mg/m^3, and of beryllium at 0.002 mg/m^3;
>beryllium is a very toxic light-metal poison, and I always thought
>the oxide was just as toxic.

>	John Whitmore

Yep. Only problem with BeO is in very fine powders. Which means you 
definitely DON'T want to inhale the stuff- can cause death in extreme
cases, ,cancer in some, etc.

Perfectly safe handled properly though. WON'T turn you into the
'toxic avenger' if you touch it. Just be careful about any usage
which would abrade it- sawing, laser trim, etc. need to be done
under well controlled conditions.

I'm sure that any vendor who would sell you the stuff would have
handling advisories.

In any case, in answer to the original question- anodized aluminum
would be my best recommendation.

Stan Bischof
HP-SRSD

*************************************************
Merely my own opinions and in no way related to
those of my employer- Hewlett Packard.
*************************************************
From: DOCTORJ@SLACVM.SLAC.STANFORD.EDU (Jon J Thaler)
Newsgroups: sci.materials
Subject: Re: Super Conducting Supercollider
Date: 31 Jul 92 15:52:19 GMT
Article-I.D.: SLACVM.92213.075220DOCTORJ
Organization: Stanford Linear Accelerator Center

rcj@lhdsy1.lahabra.chevron.com (R.C. Jones) says:

> I know that the Macneil Leherer hour on PBS is
> a political program, but I can't help asking if
> my ears  heard Rustum Roy say " Nobel Laureates in
> physics! Who cares about them. "
> What are the more scientific opinions about the value
> of the Super Conducting SuperCollider program?

Despite Rustum Roy's extremism (he said that the SSC is not science),
the main issue is one of cost.  Even Dale Bass would not object to
the SSC if it only cost $10.95.  The main scientific goal of the SSC
is to discover the Higgs boson or its dynamical equivalent.  One of
these must exist if spontaneous symmetry breaking is responsible for
low energy particle physics phenomenology.  The energy of the SSC was
chosen to ensure that theoretical predictions will be confronted by data.

In the PBS program, I thought that Bumpers and Johnston, the politicians,
did a much better job of presenting their cases than did Schwitters and Roy,
the scientists.
Newsgroups: sci.materials
From: keats@IASTATE.EDU (Venkata K Polineni)
Subject: Finite element wear simulation of fiber-reinforced composites 
Reply-To: keats@IASTATE.EDU (Venkata K Polineni)
Organization: Iowa State University
Date: Tue, 28 Jul 1992 03:11:09 GMT

I see some discussion going on about finite element studies of fracture
mechanics. I am into studying the wear mechanism of glass/graphite fiber
reinforced polymer composites. To date, I haven't found a single paper
on this particular topic. If anybody out there is doing similar work
or knows someone doing this work, kindly emmail me.

Krishna


Xref: sparky sci.materials:590 sci.physics:12115
From: matt@physics.berkeley.edu (Matt Austern)
Newsgroups: sci.materials,sci.physics
Subject: Re: Super Conducting Supercollider
Followup-To: sci.physics
Date: 31 Jul 92 10:23:46
Organization: Lawrence Berkeley Laboratory (Theoretical Physics Group)
Reply-To: matt@physics.berkeley.edu
NNTP-Posting-Host: physics.berkeley.edu
In-reply-to: rcj@lhdsy1.lahabra.chevron.com's message of 31 Jul 92 03:57:19 GMT

In article <5568@lhdsy1.lahabra.chevron.com> rcj@lhdsy1.lahabra.chevron.com (R.C. Jones) writes:

> What are the more scientific opinions about the value
> of the Super Conducting SuperCollider program?

There is essentially no doubt that the SSC will be scientifically
valuable.  That is: the experiments that are planned will probably
function more or less as designed, and they are almost certain to
yield results that are very important to particle physics.  In fact,
there are a great many questions in particle physics today that can
only be answered by doing experiments at the 1 TeV energy scale.  The
SSC is not the only possible way of doing such experiments, but it is
probably the best (and cheapest) way.

Of course, that does not necessarily mean that it should be built: the
fact that it is a worthwhile experiment does not mean that it is worth
$8 billion.  This is a political question, not a scientific question,
and scientists, like everyone else, have varying political opinions.

(Particle physicists are almost unanimous in supporting the
construction of the SSC; the opinions of scientists in other fields
are more diverse.)
--
Matthew Austern              I dreamt I was being followed by a roving band of
(510) 644-2618               of young Republicans, all wearing the same suit,
matt@physics.berkeley.edu    taunting me and shouting, "Politically correct
austern@theorm.lbl.gov       multiculturist scum!"... They were going to make
austern@lbl.bitnet	     me kiss Jesse Helms's picture when I woke up.
Xref: sparky sci.materials:587 sci.electronics:13696
From: pierson@cimill.enet.dec.com (Dave Pierson)
Newsgroups: sci.materials,sci.electronics
Subject: Re: Negative resistance
Date: 31 Jul 92 15:58:11 GMT
Organization: Digital Equipment Corporation

In article <13404@creare.COM>, kwg@creare.COM (Kent Goeking) writes...

>   I would like to know if there are any materials that demonstrate negative
>   resistance on the macroscopic scale.  I am aware of this behavior in tunnel
>   diodes but I wonder if it might not occur in other structures. 

	Many (most?  All?) plasmas display negative resistance.  Thats what the
	ballast in a fluorescent lamp does, provide a postive
	reactance/impedance to "null" the negative resistance of the arc column.
	(You can use resistor, but its wasteful.)

	With care, one can design an "arc amplifier".  In fact the arc
	transmitters (distinct from spark gap transmitters) of early wireless
	used the arc gain to function as oscillators.

	Roughly speaking, the "hotter" the plasma, the lower the resistance.
	The lower the resistance, the higher the current,
	the higher the current, the hotter the plasma... (repeat until
	fuse blows).  By paralleling the arc with resonant circuit, the current
	change can be coupled to the resonant frequency.
	
thanks
dave pierson			|the facts, as accurately as i can manage,
Digital Equipment Corporation	|the opinions, my own.
146 Main Street
Maynard, Mass
01754				pierson@cimnet.enet.dec.com
"He has read everything, and, to his credit, written nothing."  A J Raffles
Newsgroups: sci.materials
From: kekare@mecad.uta.edu (Sagar A. Kekare)
Subject: Oxidation of TiAl intermetallics
Keywords: TiAl intermetallics, Oxidation
ReplyTo: kekare@mecad.uta.edu (Sagar A. Kekare)
Organization: University of Texas at Arlington
NntpPostingHost: mecad.uta.edu
Date: Thu, 23 Jul 1992 07:12:43 GMT
X-Bytes: 337

I am working on the oxidation behavior of TiAl intermetallics with ternary  
alloying additions. I need a reliable method to estimate the stoichiometric  
formulae of the different oxide layers formed on the surfaces.

I would be grateful to receive help from anyone who has done this kind of stuff  
before.

Thanks in advance !

Sagar
Newsgroups: sci.materials
From: smlin@Uz.nthu.edu.tw (Sze-Min Lin (MS G803560) TEL.715131-3836)
Subject: Re: Insulator with good heat conductivity
Organization: National Tsing Hua University (HsinChu)
Distribution: na
Date: Wed, 29 Jul 1992 13:15:00 GMT

parks@gibbs.physics.purdue.edu (Chris Parks) writes:
> 
> What is a good material (good=price + availability) which is
> an electrical insulator and a good conductor of heat?
> 
> It will be used at temperatures as low as 4.2 Kelvin and it needs
> to hold up to about 200 volts / mm, heat conductivity needs to
> be comparable to copper.  Does it exist?
> 
> Note: Diamond may be ideal but not practical!
> 
> Chris Parks
> parks@physics.purdue.edu

i don't know why the diamond is excluded. the synthetic diamond
film (polycrystalline film grown by chemical vapor deposition
or other means) may be a good candidate, i think.

benjamin s. m. lin

---------------------------------
smlin@uz.nthu.edu.tw
dept. of materials sci. & eng.
national tsing hua university
hsinchu 30043, taiwain
republic of china
---------------------------------

Newsgroups: sci.materials
From: fhapgood@world.std.com (Fred Hapgood)
Subject: measures of hardness
Organization: The World @ Software Tool & Die
Date: Wed, 29 Jul 1992 16:19:39 GMT

I have been reading in a geology text about something called a
'Moh scale' that quantifies degrees of mineral hardness.  Apparently
some gentleman by that name placed ten minerals in order of hardness
and assigned them the digits 1-10.  This seems primitive.  Is there
a more comprehensive and precise measure of hardness in use?