Process for the manufacture of substantially pore-free shaped po

Details Process for the manufacture of substantially pore-free shaped po Process for the manufacture of substantially pore-free shaped po

1981-02-25

1982-09-28

Lusignan, Michael R.

Coating processes

Solid particles or fibers applied

Uniting particles to form continuous coating with...

427190, 427189, 427201, 427202, 427203, 427204, 427205, 427206, 427370, 4273764, 4273766, 4273977, 4273978, 427402, 4274071, 427409, 427416, 427417, 427418, 4274192, 4274197, B05D 302

Patent

active

043518583

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.

REFERENCES:
patent: 3189477 (1965-06-01), Shaffer
patent: 3393090 (1968-07-01), Barraco
patent: 3911188 (1975-10-01), Torti et al.
patent: 4112143 (1978-09-01), Adlerborn et al.

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