B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
75/164
B22F 3/00 (2006.01) B22F 3/10 (2006.01) B22F 3/12 (2006.01) C04B 35/64 (2006.01)
Patent
CA 1177292
D-103 METHOD OF MAKING INELASTICALLY COMPRESSIBLE DUCTILE PARTICULATE MATERIAL ARTICILE AND SUBSEQUENT WORKING THEREOF ABSTRACT OF THE DISCLOSURE Ductility is controlled by controlling the size of the particles of particulate material and/or the degree of sphericity of the particles, the smaller and/or more spherical the particles, the greater the ductility of the material. The material has preferably spherical pores, pre- ferably hermetic, with a controlled ratio of pore volume to material volume to provide the property of compressibility. The particulate material itself must have the capability of becoming ductile. The ratio of pore volume to total volume of the material is controlled by particle size, sint- ering profile the property of the material and the initial volume loading of the pre-sintered part (i.e. the ratio of binder to particulate material). Some materials which are not ductile in and of themselves can be formed into ductile and/or compressible materials in accordance with the system of the present invention, This material can then be formed into a predetermined shape with subsequent binder removal and sintering in accordance with prior art methods except that the sintering profile may be controlled, if necessary, as one means of controlling the desire porosity of the part. Materials as described above can be formed by in- elastic compression techniques since the articles are compres- sible due to the voids, the compressed material retaining its compressed shape. This can be provided by the well known coining, hot isotatic pressing techniques and other well known techniques, Precision parts with densities approaching theoreticl maximum density for the material involved can be preformed using these techniques. In accordance with this method, a part is formed and sintered having a shape which is substantially the same as the final shape desired but of slightly larger dimension. This article is then placed in a forming die cavity and compressed according to the contour- of the die. unlike conventional materials, the form will compress to the shape of the die with great accuracy. It is necessary, of course, that the degree of compression in the forming machine in volumetric terms be the same as or less than the volumetric content of the pores within the body to be formed. In this way precision parts can be formed to predetermined substantially exact dimension with substantially no flash.
368516
Kirby Eades Gale Baker
Witec Cayman Patents Ltd.
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