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A kind of preparation method of boron carbide based cermet composite material

A technology of ceramic composite materials and boron carbide, applied in the field of ceramic composite materials, can solve the problems of affinity affecting grain boundary performance, poor fracture toughness, uncoordinated distribution, etc., achieve good isotropy, improve grain boundary performance, and improve grain boundary performance effect

Active Publication Date: 2020-11-17
NINGBO DONGLIAN MECHANICAL SEAL
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Problems solved by technology

[0002] Existing boron carbide-based ceramic composite materials have high brittleness, poor fracture toughness, and many deficiencies in corrosion resistance and wear resistance. Isotropy, uniformity of structure, oxidation resistance and high temperature creep resistance all need to be improved. The main reason for the defect is that the distribution of the components in the composite material is not coordinated in the crystal, especially the affinity between the various components affects the grain boundary properties. The preparation method of high-strength and high-toughness boron carbide-based cermet composites with high thermal conductivity, oxidation resistance and high temperature creep resistance is of great significance

Method used

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Embodiment

[0019] A method for preparing a boron carbide-based cermet composite material, comprising the following steps:

[0020] 1) Weigh the following raw materials in parts by weight: 90 parts of boron carbide, 3 parts of zirconia, 2 parts of yttrium oxide, 2 parts of chromium carbide, and 3 parts of cobalt-nickel alloy; the weight ratio of cobalt and nickel in the cobalt-nickel alloy For: 1:3.

[0021] 2) First, ball mill boron carbide and chromium carbide to an average particle size of 10-50um; use a spray drying tower to granulate, add to a sintering furnace and sinter at 1600°C for 5 hours, keep warm for 1 hour, and ball mill again to an average particle size of 15um after cooling obtain sintered material;

[0022] 3) Add zirconia, yttrium oxide, and cobalt-nickel alloy into a ball mill and mill until the average particle size is 200 nm, then mix evenly with the sintered material prepared in step 2), add the existing binder and granulate in the spray drying tower, Pass through ...

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Abstract

The invention discloses a preparation method of a boron-carbide-based metal ceramic composite material. The method comprises the following steps that (1) the raw materials including, by weight, 76-96.9 parts of boron carbide, 1-5 parts of zirconium oxide, 1-4 parts of yttrium oxide, 1-5 parts of chrome carbide and 0.1-10 parts of cobalt-nickel alloy are weighed; (2) firstly, the boron carbide andchrome carbide are subjected mixed ball milling until the average particle size is 10-50 microns; a spray drying tower is used for pelletizing, particles are added into a sintering furnace for sintering for 5-12 hours at 1,400-1,600 DEG C, heat preservation is conducted for 1-3 hours, and after cooling is conducted, ball milling is conducted again until the average particle size is 15-30 microns,so that a sintering material is obtained. The prepared boron-carbide-based metal ceramic composite material has good isotropy, structure uniformity, thermal conductivity, oxidation resistance and high-temperature creep resistance.

Description

technical field [0001] The invention relates to the technical field of ceramic composite materials, in particular to a method for preparing a boron carbide-based cermet composite material. Background technique [0002] Existing boron carbide-based ceramic composite materials have high brittleness, poor fracture toughness, and many deficiencies in corrosion resistance and wear resistance. Isotropy, uniformity of structure, oxidation resistance and high temperature creep resistance all need to be improved. The main reason for the defect is that the distribution of the components in the composite material is not coordinated in the crystal, especially the affinity between the various components affects the grain boundary properties. , thermal conductivity, oxidation resistance and high temperature creep resistance of high strength, high toughness boron carbide based cermet composite material preparation method is of great significance. Contents of the invention [0003] The t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/02
CPCC22C1/051C22C29/005C22C29/02
Inventor 李少峰李友宝励永平
Owner NINGBO DONGLIAN MECHANICAL SEAL
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