These tend to produce very dense ceramics, but do so slowly.
The principles of sintering-based methods is simple. Once a roughly held together object (called a "green body") is made, it is baked in a kiln, where diffusion processes cause the green body to shrink. The pores in the object close up, resulting in a denser, stronger product. The firing is done at a temperature below the melting point of the ceramic. There is virtually always some porosity left, but the real advantage of this method is that the green body can be produced in any way imaginable, and still be sintered. This makes it a very versatile route.
There are thousands of possible refinements of this process. Some of the most common involve pressing the green body to give the densification a head start and reduce the sintering time needed. Sometimes organic binders such as polyvinyl alcohol are added to hold the green body together; these burn out during the firing (at 200–350 °C). Sometimes organic lubricants are added during pressing to increase densification. It is not uncommon to combine these, and add binders and lubricants to a powder, then press. (The formulation of these organic chemical additives is an art in itself. This is particularly important in the manufacture of high performance ceramics such as those used by the billions for electronics, in capacitors, inductors, sensors, etc. The specialized formulations most commonly used in electronics are detailed in the book "Tape Casting," by R.E. Mistler, et al., Amer. Ceramic Soc. [Westerville, Ohio], 2000.) A comprehensive book on the subject, for mechanical as well as electronics applications, is "Organic Additives and Ceramic Processing," by D. J. Shanefield, Kluwer Publishers [Boston], 1996.
A slurry can be used in place of a powder, and then cast into a desired shape, dried and then sintered. Indeed, traditional pottery is done with this type of method, using a plastic mixture worked with the hands.
If a mixture of different materials is used together in a ceramic, the sintering temperature is sometimes above the melting point of one minor component – a "liquid phase" sintering. This results in shorter sintering times compared to solid state sintering.
Inorganic compound
An inorganic compound is a chemical compound that does not have carbon–hydrogen bonds that is, it is "not" an organic compound. That means it is not a carbon-based compound.
The division between the two types of compound is not absolute. Some carbon-containing compounds are traditionally considered inorganic. Many chemicals in nature are not compounds, but are ions. Sodium, chloride, and phosphate ions are essential for life, as are some inorganic molecules such as nitrogen, carbon dioxide, water and oxygen. Aside from these simple ions and molecules, virtually all compounds covered by biochemistry contain carbon and can be considered organic or organometallic.
Major types of inorganic compounds may include:
Applied mechanics
Applied mechanics, also known as theoretical and applied mechanics, is a branch of the physical sciences and the practical application of mechanics. Applied mechanics examines the "response of bodies (solids and fluids) to external forces". Some examples of "mechanical systems" include the flow of a liquid under pressure, the fracture of a solid from an applied force, or the vibration of an ear in response to sound. A practitioner of the discipline is known as a mechanician.
Applied mechanics, as its name suggests, bridges the gap between physical theory and its application to technology.
Mechanics
Mechanics is a branch of physics which looks at objects that are moved by forces (including other bodies, or forces of nature).
The discipline has its roots in ancient Greece where Aristotle studied the way bodies behaved when they were thrown through the air (e.g. a stone). However it was Galileo, Kepler and especially Newton who laid the foundations for much of the so-called "Newtonian mechanics" we know today.
A person working in the discipline is known as a mechanician.
Mechanics is the original discipline of physics, dealing with the macroscopic world that humans perceive. It is therefore a huge body of knowledge about the natural world. Mechanics encompasses the movement of all matter in the universe under the four forces: gravity, the strong and weak interactions, and the electromagnetic interaction.
Mechanics also constitutes a central part of technology.
Newton proposed three laws of motion.
The following are categorized as being part of Quantum mechanics:
Blogs:
Newton
Newton may refer to many things:
Newton was the name of some famous people:
Newton is also the name of several places:
Paleobiology
Paleobiology is a branch of science which studies animals, plants and microbes buried in rock. These stoney items are called fossils. Paleobiology combines biology with the study of these fossils. There are several branches of paleobiology:
Baron Franz Nopcsa von Felső-Szilvás started paleobiology in the late 19th century while working at the University of Vienna. He tried to learn how the animals lived, rather than merely put together their bones, as many geologists were doing at the time.
Central venous catheter
A central venous catheter (CVC) or "central line" is a catheter put in a large vein in the neck, chest, or groin when a patient needs close cardiovascular monitoring, for assessment of fluid status, and so that intravenous drugs and fluids can be given to the patient more effectively. The veins most commonly used are the internal jugular vein, the subclavian vein, and the femoral vein.
Central line (disambiguation)
Central line or Central Line may refer to:
Macroscopic
Macroscopic means physical objects that are measurable and can be seen by the naked eye.
When one uses macroscopic for abstract objects, one thinks of the world as we see it without any help. Lengths scales are called macroscopic if they fall in the range of more or less than 1 mm or up to 1 km.
One may use the term "macroscopic" also for a "larger view", namely a view only available from a large perspective. A macroscopic position could be considered the "big picture".
In physics macroscopy is a relative term. If one looks at a galaxy, a star is microscopic in comparison with the whole galaxy, even if it is many, many orders of magnitude larger than us. macroscopy can also be described as a relation between any two objects in terms of its magnification on a scale of some sort. A macroscopic object is something that we are able to see in plain sight through our own field of vision no matter where we are located. In spacetime light must also come into contact with our eyes and the object we are observing in order for it to be visible.
Naked eye
If you can see something with the naked eye, it means that you can see things without using a microscope, binoculars, glasses or a telescope. In astronomy a naked-eye object is something, such as a star, that the general public can see without using these tools.
Order of magnitude
If two numbers have the same order of magnitude, they are about the same size.
But if one would compare the surface of an orange with that of the earth, one would say the surface of the earth is many "orders of magnitude" larger than that of the orange.
Orders of magnitude are generally used to make very approximate comparisons. It is mainly used while doing scientific notation. If two numbers differ by one order of magnitude, one is about ten times larger than the other. If they differ by two orders of magnitude, they differ by a factor of about 100. Two numbers of the same order of magnitude have roughly the same scale: the larger value is less than ten times the smaller value.
N-Gage
The Nokia N-Gage is a mobile phone and handheld game console. It was first sold on October 7, 2003.
Woodside
Woodside is the name of several places.
Handheld game console
A handheld game console is a light, portable electronic machine for playing video games.