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Preparation method of silicon nitride-based high-temperature anti-wear and antifriction composite material

A silicon nitride-based, composite material technology, applied in the field of new materials, can solve the problems of inability to meet the actual needs of the industry, reduce the tribological properties of materials, deteriorate the mechanical properties of ceramics, etc., and achieve good tribological properties, high temperature anti-wear and friction reduction Excellent effect, high temperature performance improvement effect

Inactive Publication Date: 2019-03-01
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, for the maintenance of ceramic properties, high temperature is an extremely unfavorable factor
The effect of thermal stress will seriously deteriorate the mechanical properties of ceramics, thereby reducing the tribological properties of materials
Studies have shown that when the test temperature exceeds 600 ° C, the friction coefficient of silicon nitride remains between 0.8 and 1, and the wear rate is 10. -3 mm 3 / Nm~10 -2 mm 3 / Nm, such poor lubrication and wear cannot meet the actual needs of the industry

Method used

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  • Preparation method of silicon nitride-based high-temperature anti-wear and antifriction composite material
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  • Preparation method of silicon nitride-based high-temperature anti-wear and antifriction composite material

Examples

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Effect test

Embodiment 1

[0026] Example 1 A method for preparing a silicon nitride-based high-temperature anti-wear and anti-friction composite material, comprising the following steps:

[0027] ⑴In terms of mass percentage, 10% of α-Si 3 N 4 and 90% Ti 3 SiC 2 Put it into a planetary ball mill, and carry out wet ball mixing under the conditions of a ball-to-material ratio of 10:1, a rotational speed of 300 r / min, and a ball milling time of 10 h to obtain a mixed powder.

[0028] (2) After the mixed powder is dried and sieved, it is loaded into a cylindrical graphite mold with a diameter of 25 mm, the pressure is 80 MPa, and the pre-compression is carried out under the conditions of a holding time of 10 s to obtain a pre-compression sample.

[0029] (3) The pre-pressed sample is sintered at high temperature and high pressure. The high temperature and high pressure sintering conditions refer to a pressure of 30MPa, a sintering temperature of 1680°C, a heating rate of 100°C / min, a holding time of 10m...

Embodiment 2

[0034] Example 2 A method for preparing a silicon nitride-based high-temperature anti-wear and anti-friction composite material, comprising the following steps:

[0035] ⑴In terms of mass percentage, 20% of α-Si 3 N 4 and 80% Ti 3 SiC 2 Put it into a planetary ball mill, and carry out wet ball mixing under the conditions of a ball-to-material ratio of 10:1, a rotational speed of 300 r / min, and a ball milling time of 10 h to obtain a mixed powder.

[0036] (2) After the mixed powder is dried and sieved, it is loaded into a cylindrical graphite mold with a diameter of 25 mm, the pressure is 80 MPa, and the pre-compression is carried out under the conditions of a holding time of 10 s to obtain a pre-compression sample.

[0037] (3) The pre-pressed sample is sintered at high temperature and high pressure. The high temperature and high pressure sintering conditions refer to a pressure of 30MPa, a sintering temperature of 1680°C, a heating rate of 100°C / min, a holding time of 10m...

Embodiment 3

[0039] Example 3 A method for preparing a silicon nitride-based high-temperature anti-wear and anti-friction composite material, comprising the following steps:

[0040] ⑴In terms of mass percentage, 30% of α-Si 3 N 4 and 70% Ti 3 SiC 2 Put it into a planetary ball mill, and carry out wet ball mixing under the conditions of a ball-to-material ratio of 10:1, a rotational speed of 300 r / min, and a ball milling time of 10 h to obtain a mixed powder.

[0041] (2) After the mixed powder is dried and sieved, it is loaded into a cylindrical graphite mold with a diameter of 25 mm, the pressure is 80 MPa, and the pre-compression is carried out under the conditions of a holding time of 10 s to obtain a pre-compression sample.

[0042] (3) The pre-pressed sample is sintered at high temperature and high pressure. The high temperature and high pressure sintering conditions refer to a pressure of 30MPa, a sintering temperature of 1680°C, a heating rate of 100°C / min, a holding time of 10m...

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Abstract

The invention relates to a preparation method of a silicon nitride-based high-temperature anti-wear and antifriction composite material. The preparation method comprises the following steps that (1) alpha-Si3N4 and Ti3SiC2 are added to a ball mill and subjected to wet-type ball mixing to obtain mixed powder; (2) the mixed powder is dried, sieved and then loaded in a graphite mold for pre-pressingto obtain a pre-pressing sample; (3) the pre-pressing sample is subjected to high-temperature and high-pressure sintering and then furnace cooling to obtain a blank; and (4) after the blank is subjected to surface polishing treatment, the silicon nitride-based composite material is obtained. The preparation process is simple and controllable, the production efficiency is high, the powder does notneed special treatment, and the preparation method is suitable for quantity production. An obtained finished product has excellent high-temperature anti-wear and antifriction effects, and the servicelife of a ceramic component is greatly prolonged in a high-temperature environment.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a method for preparing a silicon nitride-based high-temperature anti-wear and anti-friction composite material. Background technique [0002] In recent years, with the development of aerospace, shipping, and national defense and military fields, the requirements for the tribological properties of structural ceramics have become more and more stringent. If the material itself cannot achieve self-lubrication or high wear resistance, this will greatly shorten the mechanical parts. A long service life is a huge waste of manpower and material resources. Among many ceramic materials, silicon nitride is processed into bearings, valves, seals, radar wire covers and missiles due to its high mechanical strength, good thermal shock stability, corrosion resistance, oxidation resistance and environmental friendliness. Components such as tail nozzles play an important role. [0003] Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/626
CPCC04B35/584C04B35/62615C04B2235/3817C04B2235/3856C04B2235/96
Inventor 乔竹辉刘炯杰杨军朱圣宇程军于源
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI