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Preparation method of pressureless sintering micro-nano mixed silicon carbide granulated powder

A technology of micro-nano mixing and silicon carbide, which is applied in the field of preparation of silicon carbide granulated powder, can solve the problems of inability to achieve uniform dispersion and easy agglomeration of nanoparticles, and achieve good dispersion effect, safe preparation process and low risk.

Inactive Publication Date: 2021-01-26
黑龙江冠瓷科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the existing problem that nano-particles of silicon carbide are introduced into the granulation process to toughen silicon carbide ceramics, and the nano-particles are easy to agglomerate and combine, and uniform dispersion cannot be achieved. Preparation method of silicon granulated powder

Method used

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  • Preparation method of pressureless sintering micro-nano mixed silicon carbide granulated powder

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specific Embodiment approach 1

[0032] Specific embodiment one: the present embodiment is a kind of preparation method of pressureless sintering micro-nano mixed silicon carbide granulated powder, it is carried out according to the following steps:

[0033] 1. Powder pretreatment:

[0034] The silicon carbide micropowder, silicon carbide nanopowder and sintering aid are respectively placed in an oven and dried at a constant temperature to obtain pretreated silicon carbide micropowder, pretreated silicon carbide nanopowder and pretreated sintering aid;

[0035] The particle size of the silicon carbide micron powder is 0.3 μm to 10 μm; the particle size of the silicon carbide nano powder is 1 nm to 200 nm;

[0036] 2. High energy processing:

[0037] The pretreated silicon carbide nanopowder is blended with a surfactant, then spread flat, and subjected to surface modification treatment for 5s to 1200s under the irradiation conditions of infrared light, ultraviolet light or electromagnetic waves with a frequen...

specific Embodiment approach 2

[0057] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the sintering aid described in step 1 is a mixture of one or more of carbon, boron and boron carbide; the constant temperature described in step 1 Drying is carried out at a drying temperature of 60° C. to 120° C. for 2 hours to 24 hours. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0058] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the surfactant described in step two is a kind of in silane coupling agent, N-acyl glutamate and polycarboxylate or a mixture of several of them. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method of pressureless sintering micro-nano mixed silicon carbide granulation powder, and relates to a preparation method of silicon carbide granulation powder. The method mainly solves the problems that silicon carbide nanoparticles are introduced in the existing granulation process to toughen silicon carbide ceramic, the nanoparticles are easy to agglomerateand combine, and uniform dispersion cannot be achieved. The preparation method comprises the following steps: 1, powder pretreatment; 2, high-energy treatment; 3, dispersing the nano powder; 4, dispersing the micron powder; 5, mixing the slurry; and 6, spray granulation. The method is used for preparing the pressureless sintering micro-nano mixed silicon carbide granulation powder.

Description

technical field [0001] The invention relates to a preparation method of silicon carbide granulated powder. Background technique [0002] Silicon carbide ceramics are widely used due to their good thermal conductivity, high temperature resistance, thermal shock resistance, small thermal expansion coefficient, corrosion resistance, wear resistance, and high hardness. The silicon carbide ceramics produced by the pressureless sintering process have excellent performance and low cost. The introduction of silicon carbide nanoparticles in the granulation process can further improve the performance of silicon carbide ceramics through nano-toughening. [0003] Introducing silicon carbide nanoparticles in the granulation process, the focus and difficulty lies in the effective dispersion of silicon carbide nanopowders. Due to the small size of nanoparticles, large specific surface area and high surface energy, nanoparticles have the characteristics of agglomeration. Through agglomer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622C04B35/626C04B35/64
CPCC04B35/565C04B35/622C04B35/62695C04B35/64C04B2235/77C04B2235/95
Inventor 王志江
Owner 黑龙江冠瓷科技有限公司
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