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CBN-B4C composite material and preparation method thereof

A composite material, cbn-b4c technology, applied in the field of cBN-B4C composite material and its preparation, can solve the problems of reducing the hardness of the material, the loss of hardness, the hardness of the sintered product or the influence of fracture toughness, etc. Effects of pollution-free equipment requirements

Pending Publication Date: 2022-04-15
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although sintering aids can significantly increase the sintering rate, effectively control grain growth and improve the mechanical properties of the final product, especially in solving the problem of low fracture toughness of boron carbide, most sintering aids will cause varying degrees of damage. hardness loss
At present, the commonly used sintering aids for boron carbide ceramics are mainly composed of the following categories: 1. Carbon materials, but the introduction of more carbon tends to significantly reduce the hardness of the material; 2. Carbon / boride, but more carbon / boride The addition of borides is detrimental to the improvement of fracture toughness; 3. Liquid phase sintering additives (such as Al and Si), liquid phase sintering additives can effectively improve the density, but if the additive amount or sintering conditions are not properly controlled, it will affect the hardness of the sintered product. or fracture toughness negatively impact

Method used

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  • CBN-B4C composite material and preparation method thereof
  • CBN-B4C composite material and preparation method thereof
  • CBN-B4C composite material and preparation method thereof

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preparation example Construction

[0066] The second aspect of the present invention provides a cBN-B 4 The preparation method of C composite material, described method comprises the steps:

[0067] 1) Ultrasonic treatment: for cBN powder and B 4 C powder was sonicated in a liquid medium, where, based on cBN powder and B 4 C powder total weight, cBN powder is 2-60% by weight,

[0068] The sonicated cBN powder and B 4 C powder is filtered and dried to obtain a uniformly distributed precursor;

[0069] 2) Pre-pressing: pre-pressing the precursor obtained in step 1) to obtain a pre-pressed green body;

[0070] 3) Vacuum heat treatment: heat-treat the pre-pressed green body obtained in step 2) under vacuum protection, and then cool to obtain a vacuum-treated green body;

[0071] 4) Sintering: Put the vacuum heat-treated green body obtained in step 3) into the assembly block, then put the assembly block containing the vacuum heat-treated green body into a press, pressurize to the sintering pressure, and then ra...

Embodiment 1

[0146] 1) Weigh 0.2g cBN powder and 1.8g BN powder respectively 4 C powder was placed in 30ml of alcohol, ultrasonically stirred for 10 minutes, and the ultrasonic power was 600w. The solution after ultrasonic stirring was filtered, and then dried in an oven at 100°C to obtain a uniformly distributed precursor;

[0147] 2) Manually grind the precursor obtained in step 1) in an agate mortar for 10 minutes to obtain the ground precursor powder; then hold the ground precursor powder under a pressure of 2 MPa for 10 minutes, and pre-press it into a diameter of 10 mm. 10mm pre-pressed body, and place the pre-pressed body in B 4 C mold;

[0148] 3) B containing the pre-pressed green body 4 Put the C mold into the tube furnace together, and evacuate the tube furnace to 1×10 -1 Pa, keep the vacuum for 10 minutes, observe whether the indication of the vacuum gauge changes, if there is no change, raise the furnace temperature from room temperature to 800 °C at a heating rate of 3 °C / ...

Embodiment 2

[0151] 1) Weigh 1g cBN powder and 1g BN powder respectively 4 C powder was placed in 30ml of alcohol, ultrasonically stirred for 30 minutes, and the ultrasonic power was 200w, the solution after ultrasonic stirring was filtered, and then dried in an oven at 100°C to obtain a uniformly distributed precursor;

[0152] 2) Manually grind the precursor obtained in step 1) in an agate mortar for 30 minutes to obtain the ground precursor powder; then hold the ground precursor powder under a pressure of 10 MPa for 5 minutes, and pre-press it to a height of 5 mm in diameter 5mm pre-pressed body, and place the pre-pressed body in B 4 C mold;

[0153] 3) B containing the pre-pressed green body 4 Put the C mold into the tube furnace together, and evacuate the tube furnace to 1×10 -3 Pa, keep the vacuum for 3 minutes, observe whether the indication of the vacuum gauge changes, if there is no change, raise the furnace temperature from room temperature to 900°C at a rate of 5°C / min, keep ...

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Abstract

The invention provides a cBN-B4C composite material and a preparation method thereof. The cBN-B4C composite material is a two-phase composite material comprising cubic BN and B4C, and has a Vickers hardness of 28 GPa or more, a fracture toughness of 3.0 MPa.m1 / 2 or more, and a density of 2.0 g / cm3 or more. The cBN-B4C composite material has excellent fracture toughness, and also has high hardness and high density.

Description

technical field [0001] The invention relates to the field of composite material preparation, in particular to a cBN-B 4 C composite material and its preparation method. Background technique [0002] Boron carbide (B 4 C) Ceramic blocks have many excellent properties, such as high melting point, high hardness, low density, good chemical inertness, excellent neutron absorption capacity and high temperature thermoelectric properties. These outstanding physical and chemical properties make boron carbide play an irreplaceable role in many fields such as wear-resistant materials, bulletproof armor materials, and shielding control materials for nuclear industry. But as we all know, boron carbide ceramics have two defects, one is low fracture toughness, and the other is difficult sintering. For this purpose, sintering aids are usually used. However, although sintering aids can significantly increase the sintering rate, effectively control grain growth and improve the mechanical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/5831C04B35/563C04B35/622C04B35/645
Inventor 赵智胜孙磊马梦冬李鹏辉罗坤刘兵李宝忠武英举应盼张洋李子鹤何巨龙
Owner YANSHAN UNIV