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A kind of preparation method of polycrystalline cubic boron nitride composite sheet

A cubic boron nitride and polycrystalline cubic technology is applied in the field of preparation of high-quality polycrystalline cubic boron nitride (PcBN) composite sheets. PcBN tool performance, uneven sintering structure and other problems, to achieve the effect of reducing powder mixing process, high stability, uniform and dense structure

Active Publication Date: 2015-09-30
哈尔滨海毅达超硬材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the method of preparing PcBN, the sintering method of mixing cubic boron nitride and binder powder is adopted, which is characterized in that the content ratio of cubic boron nitride and binder is usually difficult to achieve optimum, and the synthesis The condition range is narrow, and it will bring problems such as uneven sintered structure, "bridging" and "agglomeration", poor product stability and repeatability, etc., which will seriously affect the performance of PcBN tools

Method used

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  • A kind of preparation method of polycrystalline cubic boron nitride composite sheet
  • A kind of preparation method of polycrystalline cubic boron nitride composite sheet

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Embodiment 1

[0023] as attached figure 1 , 2 Shown: Select Ni with a thickness of 0.2mm and a diameter of 14.7mm 75 mn 16 co 9 Metal alloy sheet, cBN powder with a particle size of 3-5μm and a mass of 0.65g, and a YG8 cemented carbide substrate with the same sheet diameter as the metal sheet and a thickness of 3mm as raw materials, according to the metal sheet 1, cubic boron nitride powder 2 and cemented carbide The matrix 3 is put into a molybdenum cup 4 with an inner diameter of 14.8 mm from bottom to top, and is pre-pressed at 40 MPa. After a vacuum heat treatment at 700 ° C for 1 hour, it is placed in a heated graphite tube 7 kit with a salt tube 6 . Finally, the top two The raw materials of the sheet, the molybdenum cup assembly 8 and parts 9-12 are put into the pyrophyllite composite block 5 together, the size of the pyrophyllite composite block 5 is 37.5mm×37.5mm×37.5mm, the diameter of the synthetic cavity is 23mm, and the inner diameter of the graphite tube 7 is It is 18mm and...

Embodiment 2

[0025] as attached figure 1 , 2 Shown: Select a Ti sheet with a thickness of 0.1mm and a diameter of 14.7mm, cBN powder with a particle size of 3-5μm and a mass of 0.65g, and a YG8 cemented carbide substrate with the same sheet diameter as the metal sheet and a thickness of 3mm as the raw material. Boron powder 2 and cemented carbide substrate 3 are put into a molybdenum cup 4 with an inner diameter of 14.8 mm from bottom to top, pre-pressed at 40 MPa, vacuum 700 ° C for 1 hour, and then put into a heated graphite tube with a salt tube 6 7 kits, put the top two pieces of raw materials together with the molybdenum cup assembly 8 and parts 9-12 into the pyrophyllite composite block 5. The size of the pyrophyllite composite block 5 is 37.5mm×37.5mm×37.5mm. The body diameter is 23mm, the inner diameter of the graphite tube 7 is 18mm, and the height is 26mm. The PcBN composite sheet was synthesized under high temperature and high pressure on a six-sided top press. The synthesis c...

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Abstract

The invention relates to a preparation method of a polycrystalline cubic boron nitride (PcBN) composite sheet. A metal sheet infiltration method is adopted by the method, and the method comprises the steps that under high-temperature and high-pressure conditions (HPHT, 4.8-5.2GPa, 1400-1550 DEG C), metal sheets (Ni75Mn16Co9, Ti, Al and the like) with the thickness of 0.05-0.2mm are used as sintering aids, and micron order cubic boron nitride powder (the grain size of cBN is larger than or equal to 3 micrometers) and cemented carbide (WC-Co) are used as raw materials for preparing the PcBN composite sheet. According to the preparation method of the PcBN composite sheet, by means of the mutual infiltration technology of the metal sheets and a base body, the aids can be effectively infiltrated into a cBN powder layer and a cemented carbide base body, boron nitride, alloy solid solutions, metal ceramic and other sintering phases are formed in a cBN polycrystalline layer, a sintering body is even and dense in organization structure and forms high-strength composition with the hard alloy base body, and meanwhile the toughness of the base body is improved. The preparation method of the PcBN composite sheet is strong in operability, capable of eliminating pollution introduced by a power mixing procedure, composited PcBN products are high in stability, and the preparation method of the PcBN composite sheet is suitable for the precision machining field of chilled cast iron, heat-resisting alloy, quenched steel and other materials.

Description

technical field [0001] The invention belongs to the field of cutting tool material manufacturing, in particular to a method for preparing a high-quality polycrystalline cubic boron nitride (PcBN) composite sheet with controllable cubic boron nitride content and high stability. Background technique [0002] Cubic boron nitride (cBN) is another new high-tech superhard material after the advent of artificial diamond. Its hardness is second only to diamond, but its thermal stability is much higher than that of diamond, and it has greater chemical stability to iron-group metal elements. Cubic boron nitride grinding tools have excellent grinding performance, not only capable of processing difficult-to-grind materials, improving productivity, but also effectively improving the grinding quality of workpieces. The use of cubic boron nitride is a great contribution to metal processing, leading to a revolutionary change in grinding, which is the second leap in grinding technology. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/08B22F3/14
Inventor 贾洪声李海波鄂元龙
Owner 哈尔滨海毅达超硬材料有限公司
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