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Preparation method of hollow silicon carbide microspheres

A technology of hollow silicon carbide and silicon carbide, which is applied in the direction of silicon carbide and carbide, can solve the problems of low strength, high density and low density of hollow silicon carbide microbeads, and achieve good strength, good compactness and reduced density. Effect

Pending Publication Date: 2020-12-08
峨眉山市鑫锐新材料有限公司
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Problems solved by technology

Previous application number: 201911064577.8 The porous graphite prepared with ultra-fine expanded graphite powder (also a patent applied by our company) still has insufficient low density and low strength. The porous graphite microbeads prepared by this process are used as the core. Hollow silicon carbide beads have high density and low strength

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  • Preparation method of hollow silicon carbide microspheres

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Embodiment Construction

[0013] Example 1: Take the mixed dispersion prepared by graphene oxide, carbon nanotubes, and water in a weight ratio of 3:1:4, disperse it in the freezing liquid in a spray ball forming machine, and freeze it into microbeads with a particle size of 75 microns. Collected by filtration, freeze-dried for 4 hours to form airgel beads of graphene oxide and carbon nanotubes, mixed with 15% phenolic resin solution, spray-dried, solidified and carbonized into porous graphite beads, and then modified with The final 35% silica sol coating is spray-dried into spherical silica-coated microbeads, then mixed with asphalt, sintered in a vacuum furnace at 1600 degrees to form silicon carbide microbeads, and then placed in an oxidation furnace to oxidize excess carbon to produce hollow silicon carbide microbeads. The powder mixed with silicon nitride and silicon carbide in a ratio of 3:1 is mixed with the hollow silicon carbide microbeads in a ratio of 1:1, and then sintered at a temperature ...

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Abstract

The invention relates to a preparation method of hollow silicon carbide microspheres. The preparation method is characterized by comprising the following steps: 1) preparing aerogel microspheres fromgraphene oxide and carbon nanotubes; 2) coating the aerogel microspheres with a phenolic resin or sucrose solution, and carrying out spray drying to obtain spherical powder; 3) preparing porous graphite microspheres by taking pyrolytic carbon as a coating film through curing and carbonizing processes; (4) coating the porous graphite microspheres with silica sol, heating and curing the porous graphite microspheres, heating the cured porous graphite microspheres and asphalt or other organic carbon in a vacuum furnace to 2000 DEG C, and carrying out heat preservation for 1-2 hours to carry out reaction sintering. 5) obtaining microspheres for generating silicon carbide coated porous graphite; 6) decomposing redundant organic carbon in an oxidizing furnace to obtain the silicon carbide microspheres with porous graphite as an inner core. and (7) mixing powder formed by mixing silicon nitride and silicon carbide micro-powder with the prepared silicon carbide microspheres, sintering at the high temperature of 1,600-2,000 DEG C under argon, and carrying out floating separation with water to obtain the compact hollow silicon carbide microspheres with the reinforced surfaces.

Description

technical field [0001] The invention relates to a preparation method of hollow silicon carbide microbeads, in particular to the preparation of airgel microbeads prepared by mixing carbon nanotubes and graphene oxide, and the preparation of hollow silicon carbide microbeads with porous graphite as the core. craft. Background technique [0002] The porous graphite microbead prepared by the invention is an ultra-light airgel microbead prepared by mixing carbon nanotubes with a pore structure and graphene oxide. Previous application number: 201911064577.8 The porous graphite prepared with ultra-fine expanded graphite powder (also a patent applied by our company) still has insufficient low density and low strength. The porous graphite microbeads prepared by this process are used as the core. Hollow silicon carbide beads have high density and low strength. Therefore, it is necessary to find a better way to solve it. What we are going to do today is to use airgel microbeads prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/97
CPCC01P2004/34C01P2004/61C01P2006/10C01P2006/21C01B32/97
Inventor 罗建华石珂俣
Owner 峨眉山市鑫锐新材料有限公司
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