Process for the manufacture of substantially pore- free...

Details Process for the manufacture of substantially pore- free... Process for the manufacture of substantially pore- free...

B - Operations, Transporting

28

B

25/132

B28B 3/00 (2006.01) B22F 3/12 (2006.01) C04B 35/58 (2006.01) C04B 35/645 (2006.01)

Patent

CA 1158847

ABSTRACT The invention is a process for the manufacture of substantially pore-free shaped articles from polycrystalline material, such as tungsten carbide, silicon nitride, titanium boride or silicon carbide, in which encased articles preformed from pulverulent materials and having open pores are isostatically hot-pressed in a vacuum-sealed casing of vitreous or ceramic-like material in a high-pressure autoclave using an inert gas as pressure-transfer medium. Before the application of the casing material, a first layer comprising material that can be decomposed or melted, such as an organic wax or a resin-like product, or of a compressible heat- resistant material such as inorganic fibers or felts, is applied to the preformed articles. Then, the encased articles are thermally treated until the glass or ceramic layer is fused or sintered gas-tight. The articles pretreated in this manner are then isostatically hot-pressed.

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