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cBN/tin composite powder and preparation method thereof

A composite powder and composite particle technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of difficulty in obtaining polycrystalline cubic boron nitride, hindering the bonding of cBN particles, and high cost, achieving good Affinity and wettability, expanding product range, reducing effects of temperature and pressure

Inactive Publication Date: 2010-06-09
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a dense boron oxide film on the surface of cBN particles, which hinders the bonding between cBN particles, so it is difficult to obtain polycrystalline cubic boron nitride (PcBN). Currently, in the process of preparing PcBN, it is necessary to add a variety of In addition to the bonding agent to strengthen the connection on the surface of cBN particles, high temperature and high pressure methods must be used, which requires high energy consumption and high cost

Method used

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  • cBN/tin composite powder and preparation method thereof
  • cBN/tin composite powder and preparation method thereof
  • cBN/tin composite powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 2.52g of acid-treated cBN powder (particle size: 0.01-0.5μm), put it into a 500ml ball mill jar, add 3.47g of butyl titanate, 20ml of absolute ethanol and 200g of balls (Φ5) at the same time, mill and stir 5 hours, rotating speed 150r / min, then add 200ml of distilled water, continue ball milling and stirring for 12 hours, control the pH value to 7-12 during the reaction, then let it stand for 10 hours, centrifuge, and wash the solid particles twice with water, ethanol Wash once, dry in vacuum at 150°C for 0.5 hour, put it in an alumina crucible, put it in a resistance furnace and calcinate in air at 450°C for 1 hour to obtain cBN / TiO 2 Composite powder, the cBN / TiO 2 The composite powder is placed in a tubular (quartz tube) resistance furnace with programmable temperature rise, the two ends of the quartz tube are sealed, and the flow rate of 100ml / min is first passed through N 2 For 1 hour, remove the air in the tube, heat while ventilating the gas, the heating r...

Embodiment 2

[0033] Weigh 2.50g of acid-treated cBN powder (with a particle size of 1-2μm), put it into a 500ml ball mill jar, add 4.11g of butyl titanate, 37ml of absolute ethanol and 200g of balls (Φ5), and mill for 5 hour, rotating speed 150r / min, then add 200ml of distilled water, continue ball milling and stirring for 18 hours, control the pH value to 7-12 during the reaction process, then let it stand for 10 hours, centrifuge, and wash the obtained solid particles twice with water and ethanol 1 time, vacuum dry at 150°C for 1 hour, then place it in an alumina crucible, put it in a resistance furnace and calcinate in air at 450°C for 1 hour to obtain cBN / TiO 2 Composite powder, the cBN / TiO 2 The composite powder is placed in a tubular (quartz tube) resistance furnace with programmable temperature rise, the two ends of the quartz tube are sealed, and the flow rate of 100ml / min is first passed through N 2 For 1 hour, remove the air in the tube, heat while ventilating the gas, the heati...

Embodiment 3

[0035] Weigh 2.50g of acid-treated cBN powder (particle size: 2-4μm), put it into a 500ml ball mill jar, add 6.85g of butyl titanate, 34ml of absolute ethanol and 200g of balls (Φ5), and mill for 12 hour, rotating speed 150r / min, then add 250ml of distilled water, continue ball milling and stirring for 24 hours, control the pH value to 7-12 during the reaction, then let it stand for 10 hours, centrifuge, and wash the obtained solid particles twice with water and ethanol 1 time, vacuum dry at 150°C for 1 hour, then place it in an alumina crucible, put it in a resistance furnace and calcinate in air at 500°C for 1 hour to obtain cBN / TiO 2 Composite powder, the cBN / TiO 2 The composite powder is placed in a tubular (quartz tube) resistance furnace with programmable temperature rise, the two ends of the quartz tube are sealed, and the flow rate of 100ml / min is first passed through N 2 For 1 hour, remove the air in the tube, heat while ventilating the gas, the heating rate is 5°C / m...

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Abstract

The invention discloses a cBN / TiN composite powder and a preparation method thereof. The composite powder consists of composite particles taking cBN particles as cores and TiN covering layers as shells. The particle size of the cBN particles in the composite particles is between 0.01 and 20 mu m; the thikness of the TiN covering layers is between 0.01 and 20 mu m; and the molar ratio of the cBN to the TiN is 1:1-10:1. The preparation method for the cBN / TiN composite powder comprises the following steps: firstly, preparing cBN / TiO2 composite powder by a sol-gel method; and then performing high-temperature nitrogenization on the prepared cBN / TiO2 composite powder at the temperature of between 700 and 1,200 DEG C in ammonia atmosphere. The composite powder is mainly used for preparing glomerocryst PcBN, can be used as a coating or a coating additive, and has tremendous market prospect in the metal cutting tool industry such as steel cutting tools.

Description

technical field [0001] The invention relates to the surface chemical modification of cubic boron nitride powder, in particular to a cBN / TiN composite powder and a preparation method thereof. Background technique [0002] Diamond is the hardest material known and the hardest material used in the tool industry. However, when cutting steel materials at high temperatures, diamond is often catalytically converted to graphite, so its use is limited. Cubic boron nitride (cBN) is a synthetic superhard material. It is known to be second only to diamond in hardness and ranks second. Cubic boron nitride has good thermal stability and chemical inertness to iron alloys. , as a tool material can well solve the problem of high-efficiency and high-precision machining of steel materials. However, there is a dense boron oxide film on the surface of cBN particles, which hinders the bonding between cBN particles, so it is difficult to obtain polycrystalline cubic boron nitride (PcBN). Currentl...

Claims

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Application Information

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IPC IPC(8): C01B21/064C01B21/076
Inventor 张锐李和鑫陈德良王海龙李剑刘钟升温合静关莉李明亮鲍可侯贤祥万方
Owner ZHENGZHOU UNIV
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