High-entropy ceramic material with excellent tribological properties and preparation method thereof

A ceramic material and tribological technology, applied in the field of high-entropy ceramic materials and its preparation, can solve the problems of very little research on tribological properties, and achieve the effects of favorable sintering, simple preparation process, and easy densification

Active Publication Date: 2020-11-27
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on high-entropy carbide ceramics is mainly on its preparation, mechanical properties and thermophysical properties, but there are very few studies on its related tribological properties.

Method used

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  • High-entropy ceramic material with excellent tribological properties and preparation method thereof
  • High-entropy ceramic material with excellent tribological properties and preparation method thereof
  • High-entropy ceramic material with excellent tribological properties and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 A high-entropy ceramic material with excellent tribological properties, the material is in the form of a block, its composition is (Hf-Mo-Nb-Ta-Ti-)C, and it is made from the following raw materials in mass percentage: HfO 2 21.2%, MoO 3 14.5%, Nb 2 o 5 13.4%, Ta 2 o 5 22.3%, TiO 2 8.0% and graphite powder 20.6%.

[0034] The preparation method of the high-entropy ceramic material: firstly weigh each raw material according to the proportion, put each raw material in a ball mill, then add anhydrous ethanol 0.25 times its mass to the mixed raw material, mix evenly, dry, pass through Sieve to obtain mixed powder with a particle size of 5-20 μm; put the mixed powder into a graphite mold, place it in a spark plasma sintering furnace and undergo spark plasma sintering. ℃ / min, the sintering temperature is 1750 ℃, the pressure is 15 MPa, and the holding time is 30 min. After sintering, the sintered product was pulverized in a high-energy ball mill to obtain a h...

Embodiment 2

[0035] Example 2 A high-entropy ceramic material with excellent tribological properties, the material is in the form of a block, its composition is (Hf-Mo-Nb-Ta-Ti-)C, and it is made from the following raw materials in mass percentage: HfO 2 21.9%, MoO 3 15.0%, Nb2 o 5 13.8%, Ta 2 o 5 23.0%, TiO 2 8.3% and graphite powder 18.0%.

[0036] The preparation method of the high-entropy ceramic material: firstly weigh each raw material according to the proportion, and place each raw material in a ball mill, then add anhydrous ethanol 0.35 times its mass to the mixed raw material, mix evenly, dry, pass through Sieve to obtain mixed powder with a particle size of 5-20 μm; put the mixed powder into a graphite mold and place it in a spark plasma sintering furnace for spark plasma sintering. The sintering conditions refer to a vacuum degree below 0.08 Pa and an average heating rate of 150°C / min, the sintering temperature is 1850°C, the pressure is 5MPa, and the holding time is 20 mi...

Embodiment 3

[0037] Example 3 A high-entropy ceramic material with excellent tribological properties, the material is in the form of a block, its composition is (Hf-Mo-Nb-Ta-Ti-)C, and it is made from the following raw materials in mass percentage: HfO 2 21.5%, MoO 3 14.7%, Nb 2 o 5 13.6%, Ta 2 o 5 22.7%, TiO 2 8.1% and graphite powder 19.4%.

[0038] The preparation method of the high-entropy ceramic material: firstly weigh each raw material according to the proportion, and place each raw material in a ball mill, then add anhydrous ethanol 0.30 times its mass to the mixed raw material, mix evenly, dry, pass through Sieve to obtain mixed powder with a particle size of 5-20 μm; put the mixed powder into a graphite mold and place it in a spark plasma sintering furnace for spark plasma sintering. / min, sintering temperature 1800 ℃, pressure 10MPa, holding time 25 min. After sintering, the sintered product is pulverized in a high-energy ball mill to obtain a high-entropy ceramic powder ...

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Abstract

The invention relates to a high-entropy ceramic material with excellent tribological properties. The material is block-shaped, the composition of the material is (Hf-Mo-Nb-Ta-Ti-) C, the ceramic material is prepared from the following raw materials in percentage by mass: 1.2 to 21.9 percent of HfO2, 14.5 to 15.0 percent of MoO3, 13.4 to 13.8 percent of Nb2O5, 2.3 to 23.0 percent of Ta2O5, 8.0 to 8.3 percent of TiO2 and 18.0 to 20.6 percent of graphite powder. Meanwhile, the invention further discloses a preparation method of the high-entropy ceramic material. The ceramic material provided by the invention has good tribological properties and mechanical properties in a wide temperature range, and can realize lubrication at a specific temperature, thus realizing structural/lubricating function integrated design of the ceramic material.

Description

technical field [0001] The invention relates to the technical field of high-entropy materials, in particular to a high-entropy ceramic material with excellent tribological properties and a preparation method thereof. Background technique [0002] The reliability and stability of structural materials play a key role in the safe, stable and efficient operation of high-end equipment mechanical systems. With the rapid development of high technology, the working conditions of the new generation of nuclear reactors, jet engines, rocket nozzles, and supersonic vehicles are becoming more and more harsh, and the demand for high-performance high-temperature materials is more urgent. At present, the high-temperature tribological properties of high-temperature materials are mainly improved by adding a second phase (lubricating phase or wear-resistant phase). Although this method can effectively improve the tribological properties, it usually leads to a serious deterioration of its mech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/64
CPCC04B35/5607C04B35/5622C04B35/64C04B2235/3232C04B2235/3244C04B2235/3251C04B2235/3256C04B2235/425C04B2235/6562C04B2235/6567C04B2235/666C04B2235/95C04B2235/96
Inventor 杨军孙奇春刘维民朱圣宇程军乔竹辉谈辉
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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