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Synthesis method of cubic boron nitride and preparation method of cubic boron nitride sintered body

A technology of cubic boron nitride, synthesis method, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as differences

Active Publication Date: 2015-06-24
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] However, as shown in the aforementioned prior art, when cBN is synthesized from hBN, it is usually synthesized under ultra-high pressure (5 GPa or more) high temperature conditions, but for the purpose of increasing the size of cBN materials and improving productivity, etc. When enlarging, there is a large difference in the difficulty of operation and the structure of the device depending on whether ultra-high pressure (above 5GPa) is required, and, for example, the life of the large cemented carbide that is the central part of the mold device also depends on the operation. Whether the pressure is ultra-high pressure (above 5GPa) makes a significant difference

Method used

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  • Synthesis method of cubic boron nitride and preparation method of cubic boron nitride sintered body
  • Synthesis method of cubic boron nitride and preparation method of cubic boron nitride sintered body
  • Synthesis method of cubic boron nitride and preparation method of cubic boron nitride sintered body

Examples

Experimental program
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Effect test

Embodiment 1

[0064] Such as figure 1 As shown, the alloy powder of the composition composed of Co60-Mo20-V16-Al4 mass % is made in advance as a metal catalyst, and it is filled to an outer diameter of 10 mm, an inner diameter of 7 mm and a height of 7.6 mm (including 10 mass % of Zirconia powder) molded body 5 in the sample container so as to form a metal catalyst (alloy powder) layer 3 with a thickness of about 1.6 mm sandwiched between two hBN molded plates 4 with a diameter of about 7 mm and a thickness of 3 mm.

[0065]The sample is surrounded by a graphite tubular heater 1 with an outer diameter of 12 mm, an inner diameter of 10 mm, and a height of 17.6 mm. Mo foil 2 is arranged on the inner surface, and a belt-type ultra-high pressure device is used (the front end diameter of the anvil is 21 mm, and the inner diameter of the cylinder is 25 mm). Pressurize, then put electricity into the heater to heat, and keep it for a certain period of time, then drop the temperature rapidly, and th...

Embodiment 2

[0071] Using an alloy powder of a composition composed of Co40.87-Mo17.39-Cr20.87-V18.26-Al2.61% by mass as a metal catalyst, in the same manner as in Example 1, at a pressure of 4.6GPa and 1330°C As a result of cBN synthesis by reacting for 60 minutes, microparticle cBN with a cBN conversion rate of 90% or more and an average particle diameter of 20 μm was synthesized.

[0072] image 3 The X-ray diffraction curve obtained for the microparticle cBN obtained in Example 2 is shown in .

[0073] and, Figure 4 A photograph of the structure of the microparticle cBN obtained in Example 2 observed by a scanning electron microscope is shown in .

Embodiment 3

[0075] As a metal catalyst, cBN was synthesized by reacting for 30 minutes at a pressure of 4.6 GPa and 1320°C in the same manner as in Example 1, using an alloy powder having a composition composed of Co47-Mo20-Cr24-V6-Al3 mass %. Microparticle cBN with a cBN conversion rate of 80% or more and an average particle size of 20 μm was obtained. In addition, a very small amount of cBN with an average particle size of about 40 μm was also synthesized at the same time. As described above, if the added amount of V is reduced, the distribution of V becomes locally uneven, and cBN particles grow significantly to 30 μm or more in the portion where the concentration of V is low.

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Abstract

The invention provides a low pressure synthesis method for synthesizing cBN from hBN under a low pressure and a preparation method of cBN sintered body by cBN raw powder. The hBN is synthesized into the cBN at the temperature of 1200 to 1700 DEG C and under a low pressure which is above 4GPa by taking the alloy powder or the mixed powder as the metal catalyst. The cBN is the raw powder which contains the alloy powder or the mixed powder which is used as the metal catalyst and the sintering aid, and the cBN sintered body is obtained through sintering the raw powder. The alloy powder or the mixed powder is composed of the following components: one or both of the Cr and Mo when 1 to 50 mass percent Cr, 10 to 50 mass percent Mo, and 10 to 50 mass percent Cr+Mo are contained, 1 to 50 mass percent V, 5 to 8 mass percent Al, and the balance of at least two or three of Fe, Ni, or Co.

Description

technical field [0001] The present invention relates to a synthesis method of cBN in which cubic boron nitride (hereinafter referred to as cBN) is synthesized from hexagonal boron nitride (hereinafter referred to as hBN), and a method of manufacturing a cBN sintered body using the synthesized cBN as raw material powder . Background technique [0002] Conventionally, as a synthetic method for synthesizing cBN from hBN, it is known that boronitrides containing alkali or alkaline earth elements (a representative example is Li 3 BN 2 ) is a common method used as a catalyst, alloys and mixtures of transition metals such as Co, Ni, Fe, and Al are also known as effective catalysts. [0003] For example, Patent Document 1 discloses that alloys such as NiAl, CoAl, FeNiAl, and FeNiCoAl have catalytic action under conditions of a pressure of approximately 6 to 8.5 GPa and a temperature of 800 to 1600°C. [0004] Patent Document 2 discloses that Fe46-Ni32-Cr21-Al1 mass %, Ni39.2-Mn58...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/85
Inventor 阿罕默迪·埃科·瓦多约福长修
Owner MITSUBISHI MATERIALS CORP
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