Patent ID: 7255830
Filing Date: 2007-08-14
Classification: B22F,B29C,B33Y,Y02P

Abstract:
1. A method of preparing a three-dimensional sintered product which comprises (a) sintering a predetermined portion of a first powder material layer by irradiation of a first optical beam to form a first layer having a higher density, (b) forming a second powder material layer on the first layer and (c) sintering a predetermined portion of the second powder material layer by irradiation of a second optical beam to form a second layer having a lower density and bond the second lower density layer to the first higher density layer and (d) repeating (a) to (c) to form a three-dimensional sintered block comprising a plurality of the first and second layers, wherein, after an additional intermediate layer having a density equal to or lower than that of the first higher density layer, is formed on the higher density layer which is sintered smaller in thickness than a predetermined value, the second lower density layer is formed through the additional intermediate layer on the first higher density layer.