Composite pyrophyllite material

Abstract

The invention relates to a seal pressure-transmitting medium material used for synthesizing superhard material such as diamond, cubic boron nitride, composite slice, and the like, in particular to a composite pyrophyllite material The composite pyrophyllite material consists of the following raw materials by weight percentage: 50 percent to 60 percent of pyrophyllite, 12 percent to 20 percent of sericite, 8 percent to 15 percent of kaolinite, 5 percent to 10 percent of boehmite and 5 percent to 10 percent of cementing compound. The composite pyrophyllite powder briquette manufactured by the invention has good performances for sealing, pressure-transmitting, heat-preserving and insulating, provides a good environment for the nucleation growth of the superhard material, has stable flowing property and is easy for forming a sealing surface, thereby effectively reducing the phenomena of deflation and explosion during the superhard material synthesis, saving electrical energy due to the good heat preservation performance, improving the productivity due to the good pressure-transmitting performance and reducing the cost. Only South Africa owns the industrial pyrophyllite in the field of the superhard material in the world, and only Beijing Mentougou owns mineral resource in China which is insufficient. The composite pyrophyllite material is the substitute of the two and is better than the two.

Description

technical field

[0001] The invention relates to a sealing pressure transmission medium material used in the synthesis of superhard materials, in particular to a composite pyrophyllite material. Background technique

[0002] Pyrophyllite is a hydrous aluminosilicate, mainly intermediate-acid volcanic extrusive rocks, with the molecular formula AL 2 [Si 4 o 10 ](OH) 2 . Pyrophyllite has the characteristics of good sealing performance, small volume shrinkage under high pressure, low thermal conductivity and excellent fluidity. It is a pressure transmission medium commonly used in the synthesis of superhard materials such as artificial diamond, composite sheet, or cubic boron nitride Waxite powder briquette) is widely used in high-pressure synthesis of superhard materials.

[0003] However, practice has proved that there are obvious shortcomings in using a single pyrophyllite as a pressure transmission medium in the production process of synthetic superhard materials by a s...