Chamber assembly for synthesizing diamond and cubic boron nitride sintered body and assembling method

Abstract

The invention belongs to a chamber assembly for synthesizing a diamond and cubic boron nitride sintered body and an assembling method. The chamber assembly consists of a pyrophyllite composite block, a graphite heating tube, a magnesium oxide cup, an iron cup, a graphite cup, a molybdenum cup and a niobium cup, wherein the magnesium oxide cup, the iron cup, the graphite cup, the molybdenum cup and the niobium cup assembled and placed in the graphite heating tube in the pyrophyllite composite block are in close fit, sequentially the magnesium oxide cup, the iron cup, the graphite cup, the molybdenum cup and the niobium cup are arranged from outside to inside, and the molybdenum cup and the niobium cup are fastened together in opposite directions. The materials are simultaneously put in a pyrophyllite composite block sintering chamber with the graphite heating tube in a sequence from outside to inside. The deformation of the synthesized sintered body is small, the synthesis integrity rate is high, the residual stress in a super-hard material polycrystalline layer is small, the distribution is more uniform, the porosity is low and the large-sized sintered body can be prepared.

Description

technical field [0001] The invention belongs to the field of diamond and cubic boron nitride manufacturing for drilling and cutting tools, in particular to a cavity assembly and an assembly method for synthesizing diamond and cubic boron nitride sintered bodies. Background technique [0002] Superhard materials such as polycrystalline diamond and cubic boron nitride are high-performance structural materials that are formed by sintering diamond and cubic boron nitride particles under high temperature and high pressure conditions with the help of sintering aids. This material has the wear resistance and strength of superhard materials. It is an excellent cutting tool and wear-resistant material. It is widely used in machining tools, petroleum and geological drill bits, grinding wheel dressing tools, etc. [0003] Due to the different manufacturing and assembly methods of superhard materials, their product performance will also show obvious differences. From the current ap...

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Problems solved by technology

At present, the existing assembly structure does not use a suitable metal combination cup to shield pollution and remove impurities, and does not make full use of the combination of pressure transmission and heat preservation medium materials and graphite materials to support and reduce deformation, and does not fully consider the pressure field and The stability and uniformity of the temperature field does not consider the influence of impurities such as cavity gas, which will affect the overall performance of the diamond and boron nitride polycrystalline layers, which will cause uneven sintered structure, serious deformation, chipping, and stable repetition. gender issues

Seriously affect the performance of superhard material tools

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