Preparation method of boron carbide micro-nano mixed powder for hot pressed sintering

A technology of micro-nano mixing and hot-press sintering, which is applied in the field of preparation of boron carbide micro-nano mixed powder for hot-press sintering, which can solve the problems of high densification and fine grain size.

Inactive Publication Date: 2021-05-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the high densification degree and fine grain size of existing hot-pressed sintered boron carbide are difficult to have both, and to provide a preparation method of boron carbide micro-nano mixed powder for hot-pressed sintering

Method used

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  • Preparation method of boron carbide micro-nano mixed powder for hot pressed sintering
  • Preparation method of boron carbide micro-nano mixed powder for hot pressed sintering
  • Preparation method of boron carbide micro-nano mixed powder for hot pressed sintering

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specific Embodiment approach 1

[0016] Embodiment 1: In this embodiment, a method for preparing boron carbide micro-nano mixed powder for hot pressing sintering is completed according to the following steps:

[0017] 1. Dispersion of raw materials: Place nano boron carbide powder and micron boron carbide powder in deionized water containing dispersant to disperse evenly to obtain nano boron carbide slurry and micron boron carbide slurry; the particle size of nano boron carbide powder is 20nm ~300nm, the particle size of micron boron carbide powder is 1μm~10μm; the mass ratio of nanometer boron carbide powder, micron boron carbide powder and deionized water is 1:(0.5~5);

[0018] 2. Raw material mixing: mix the dispersed nano boron carbide slurry and micron boron carbide slurry evenly in step 1; wherein the mass ratio of nano boron carbide powder and micron boron carbide powder is 1:(1~50);

[0019] 3. Drying of raw materials: The boron carbide micro-nano mixed slurry is granulated into round particles by spr...

specific Embodiment approach 2

[0020] Embodiment 2: This embodiment differs from Embodiment 1 in that the mass ratios of nano boron carbide powder, micron boron carbide powder and dispersant are all 1:0.001-0.03. Others are the same as the first embodiment.

specific Embodiment approach 3

[0021] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the dispersant described in step one is tetramethylammonium hydroxide, polyvinyl pyrrolidone, sodium hydroxymethyl cellulose, polyvinylpyrrolidone Sodium acrylate or polyethylene glycol. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a preparation method of boron carbide micro-nano mixed powder for hot pressed sintering, in particular to a preparation method of boron carbide micro-nano mixed powder for hot pressed sintering, and aims to solve the problem that the high densification degree and the fine grain size of the existing hot-pressed sintered boron carbide are difficult to obtain at the same time. The preparation method comprises the following steps: proportioning nano boron carbide and micron boron carbide according to a certain ratio, mixing, granulating and drying to obtain the boron carbide micro-nano mixed powder which can be directly used for hot-pressed sintering. Compared with traditional direct ball-milling mixing, the method has the advantages that nano boron carbide and micron boron carbide are respectively dispersed into slurry and then mixed, so that the mixing uniformity is greatly enhanced, and sintering is facilitated to obtain a uniform ceramic material. By means of granulation, the powder forms a ball shape, the arch bridge effect of the powder is greatly reduced, the flowability and apparent density of the powder are improved, and hot pressing sintering densification is facilitated. The method is applied to the field of boron carbide ceramic preparation.

Description

technical field [0001] The invention relates to a preparation method of boron carbide micro-nano mixed powder for hot pressing sintering. Background technique [0002] Boron carbide was first discovered in 1858, and its stoichiometric molecular formula is B 4 The compound of C was not recognized until 1934. Due to the nature of its covalent bond, boron carbide has a high melting point, high hardness, good wear resistance, acid and alkali corrosion resistance, low density, and high thermal neutron absorption capacity. Its hardness is second only to diamond and cubic boron nitride. It is a non-metallic material with important physical and chemical properties. Boron carbide has the properties of high temperature and extraordinary hardness, and is widely used in fields such as body armor and abrasive appliances. Boron carbide is the lightest ceramic material. Because of its low density, it can be used as jet blades, and it is widely used in the field of aerospace. Because of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/626
CPCC04B35/563C04B35/62635C04B35/62695C04B2235/77C04B2235/786C04B2235/96
Inventor 王志江
Owner HARBIN INST OF TECH
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