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A kind of preparation method of diamond-cubic boron nitride-boron carbide composite material

A technology of cubic boron nitride and composite materials, which is applied in the field of superhard material manufacturing for cutting tools, can solve the problems of poor metal stability, poor oxidation resistance, and restrictions on practical application, and achieve high stability, uniform and dense structure, and high The effect of heat resistance

Active Publication Date: 2018-09-07
哈尔滨海毅达超硬材料有限公司
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Problems solved by technology

B with a rhombohedral structure 4 C, the hardness is second only to diamond and cBN (Mohs hardness 9.36, microhardness 55-67 GPa), with nearly constant high-temperature hardness (>30 GPa), however, B 4 C fracture toughness is low (2.5 MPa m 1 / 2 ), poor oxidation resistance (oxidation occurs at 600 °C in the air, rapid oxidation at 900 °C), and poor stability to metals (easy to react with metals to form metal borides), which restricts its practical application
Diamond and cubic boron nitride alloys or solid solution composite materials in the prior art have certain advantages in hardness, and their heat resistance is generally higher than that of diamond (800°C), but this performance index is also low, and as the main application indicators, the preparation of composite superhard materials with high heat resistance has great practical significance

Method used

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  • A kind of preparation method of diamond-cubic boron nitride-boron carbide composite material

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preparation example Construction

[0018] The composite material preparation method comprises the following steps:

[0019] ①. Select diamond, cubic boron nitride, and boron carbide powder as raw materials; diamond, cubic boron nitride, and boron carbide powder are required to be purified to remove impurities, with an average particle size of 20 nm-20 μm, and the weight of diamond powder is 10-80 parts. The weight part of cubic boron nitride powder is 20-80 parts, and the weight part of boron carbide powder is 5-20 parts. It also includes a binder material, the binder powder is a compound or a simple substance according to the actual processing object, one or more of Co, Ti, Al, Si, SiC, the particle size is 20 nm-20 μm, and the sticky The weight part of the binder powder is 0-50 parts.

[0020] ②. Evenly mix the mixed powder selected in the above ① and put it into a molybdenum cup for packaging;

[0021] ③. The molybdenum cup assembled in ② is pre-pressed, vacuum pre-fired, pyrophyllite composite block cavit...

Embodiment 1

[0023] as attached figure 1 Shown: select diamond powder with a particle size of 0.5 μm, cBN powder with a particle size of 0.25 μm, and B with a particle size of 3 μm 4 C, Si powder of 1 μm is used as raw and auxiliary materials, and the parts by weight are: 15 parts, 70 parts, 10 parts, and 5 parts. Mix the powder for 2 hours until it is uniform, put 1g of the mixed powder 1 into a molybdenum cup 2 with an inner diameter of 14.8mm after being pre-pressed at 5MPa, perform a vacuum heat treatment at 500°C for 0.5h, then put it into a heated graphite tube 3, and finally assemble Component insulation sheet 4, thermal insulation graphite sheet 5, conductive metal sheet 6, and conductive steel cap 7 are put into the pyrophyllite composite block 8. The size of the pyrophyllite composite block is 32.5mm×32.5mm×32.5mm, and the diameter of the synthetic cavity is 18mm. The graphite tube 7 has an inner diameter of 16mm and a height of 17mm. The six-sided top press (CS- , 6×14000 KN...

Embodiment 2

[0025] as attached figure 1 Shown: select diamond powder with a particle size of 0.5 μm, cBN powder with a particle size of 0.25 μm, and B with a particle size of 3 μm 4 C micropowder is used as a raw material, and the weight parts are respectively: 60, 20, 20. Mix the powder for 2 hours until uniform, put it into a molybdenum cup 2 with an inner diameter of 14.8 mm, pre-press 2 g of the mixed powder 1 at 5 MPa, heat treat at 500°C for 0.5 hours in a vacuum, and put it into a heated graphite tube 3, and finally insulate the assembled parts Sheet 4, thermal insulation graphite sheet 5, conductive metal sheet 6, and conductive steel cap 7 are put into the pyrophyllite composite block 8 together. 7 The inner diameter is 16mm and the height is 17mm. The six-sided top press (CS- , 6×14000 KN) for high-temperature and high-pressure synthesis, the synthesis conditions are 5 GPa, 1400 ℃, the sintering holding time is 5 minutes, and then the temperature is slowly lowered to room te...

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Abstract

The invention relates to a preparation method of a diamond-cubic boron nitride-boron carbide composite material. With a high-temperature high-pressure sintering technology, the method comprises the following specific step: under high-temperature high-pressure conditions (HPHT, 5-6 GPa and 1,350-1,500 DEG C), preparing the diamond-cubic boron nitride-boron carbide composite material by adopting high-purity powder (Co, Ti, Al, Si and the like) with a particle size of 20nm-20mu m as a sintering binder and the powder of diamond, cubic boron nitride and boron carbide (B4C) different in content proportion as raw materials. In the method for preparing a high-performance structural material, provided by the invention, through the sintering combination technology of the diamond, cBN and B4C and the binder, the sintered phases such as diamond, boron nitride, alloy solid solution and metal ceramic are formed in the composite material; and the sintered body has a uniform and dense structure and relatively high heat resistance. The method has high operability; and the synthesized product has high stability, can fill in the blank between the diamond and the boron nitride composite material, and provides a novel composite material suitable for the cutting of hard materials.

Description

technical field [0001] The invention belongs to the field of superhard material manufacturing for cutting tools, and specifically relates to a method for preparing a high-quality diamond-cubic boron nitride-boron carbide composite material with controllable content of diamond, cubic boron nitride and boron carbide and high thermal stability. . Background technique [0002] Modern machining technology is developing rapidly in the direction of high precision, high efficiency, flexibility and automation. New technical equipment, CNC machine tools, machining centers and new materials with excellent performance are increasingly widely used, especially the requirements for tool materials are increasing. higher. Superhard materials diamond, cubic boron nitride (cBN) and boron carbide (B 4 C) and its composite materials (diamond, cubic boron nitride polycrystalline and composite sheets, boron carbide-based cermets, etc.) play an important role in modern manufacturing with their ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/5831C04B35/5835
CPCC04B35/5831C04B2235/3821C04B2235/427C04B2235/428C04B2235/5436C04B2235/5445
Inventor 贾洪声李海波鄂元龙左斌
Owner 哈尔滨海毅达超硬材料有限公司
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