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Preparation method of boron carbide granulation powder for pressureless sintering

A technology of boron carbide and granulated powder, which is applied in the field of preparation of boron carbide granulated powder for pressureless sintering, which can solve the problems of poor mechanical properties and difficult density of pressureless sintered boron carbide, and achieve small particle size and accelerated densification Chemical process, the effect of increasing the specific surface energy

Active Publication Date: 2021-05-25
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 density of existing pressureless sintered boron carbide is difficult to be higher than 90% and the mechanical properties are poor, and to provide a preparation method of boron carbide granulated powder for pressureless sintering

Method used

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  • Preparation method of boron carbide granulation powder for pressureless sintering
  • Preparation method of boron carbide granulation powder for pressureless sintering
  • Preparation method of boron carbide granulation powder for pressureless sintering

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specific Embodiment approach 1

[0022] Specific embodiment one: the preparation method of a kind of boron carbide granulated powder for pressureless sintering in this embodiment is completed according to the following steps:

[0023] 1. Dispersion of raw materials: put the nano boron carbide powder in deionized water containing dispersant A to disperse evenly to obtain a nano boron carbide mixed liquid; place the micron boron carbide powder in deionized water containing dispersant B to disperse evenly to obtain micron boron carbide mixture;

[0024] 2. Mixing of raw materials: add sintering aid and binder to the nano boron carbide mixed liquid and micro boron carbide mixed liquid respectively, and ball mill and mix for 10-24 hours to obtain nano boron carbide slurry and micro boron carbide slurry respectively;

[0025] 3. Drying of raw materials: Pump the micron boron carbide slurry and nano boron carbide slurry into the atomizing pan through the two feed ports of the spray granulation tower, mix them in the...

specific Embodiment approach 2

[0033] Embodiment 2: This embodiment differs from Embodiment 1 in that: the particle size of the nano boron carbide powder described in step 1 is 20 nm to 600 nm, and the particle size distribution of the micron boron carbide powder is 0.6 μm to 50 μm. Others are the same as the first embodiment.

specific Embodiment approach 3

[0034] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, the mass ratio of nano boron carbide powder, micron boron carbide powder and deionized water is 1:1. 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 granulation powder for pressureless sintering. The invention aims to solve the problems that the density of existing pressureless sintering boron carbide is difficult to be higher than 90% and the mechanical property of the existing pressureless sintering boron carbide is poor. According to the invention, two dispersants respectively directed at nanometer boron carbide and micron boron carbide are used to prepare uniformly and stably dispersed nanometer boron carbide slurry and micron boron carbide slurry respectively. In a spray granulation process, the nanometer boron carbide slurry and the micron boron carbide slurry are instantly mixed in an atomizing disc rotating at a high speed, and then moisture in a high-temperature spray granulation tower is rapidly evaporated, so dry granulation powder is obtained, and the phenomenon of agglomeration is prevented. The method is applied to the field of preparation of boron carbide ceramic.

Description

technical field [0001] The invention relates to a preparation method of boron carbide granulated powder for pressureless 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 its s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/626C04B35/563C04B35/632C04B35/634
CPCC04B35/62695C04B35/563C04B35/632C04B35/63444C04B2235/5454C04B2235/5445C04B2235/5436C04B2235/3813C04B2235/602C04B2235/656C04B2235/6567C04B2235/77C04B2235/96
Inventor 王志江
Owner HARBIN INST OF TECH
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