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A method for preparing high-density hafnium diboride ceramics

A hafnium diboride and densification technology is applied in the field of preparing high-density hafnium diboride ceramics and high-density hafnium diboride ceramics, and can solve the problems of difficulty in densification, difficulty in preparing pure phases into blocks, and the like, Achieve high density, easy promotion and large-scale production, high hardness

Active Publication Date: 2021-06-25
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing high-density hafnium diboride ceramics, so as to solve the problems that the traditional hafnium diboride ceramics are difficult to be densified, and the pure phase is difficult to prepare into blocks.

Method used

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  • A method for preparing high-density hafnium diboride ceramics
  • A method for preparing high-density hafnium diboride ceramics
  • A method for preparing high-density hafnium diboride ceramics

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Embodiment

[0031] A method for preparing high-density hafnium diboride ceramics, comprising the following steps:

[0032] (1): Using hexagonal structure hafnium diboride powder as raw material;

[0033] (2): The raw materials obtained in step (1) are subjected to high-energy ball milling, with n-hexane as the process control agent and high-speed steel balls as the grinding balls, and the process control agent, grinding balls, and hafnium diboride raw materials according to the ratio of 4:9: After being mixed at a weight ratio of 1, place in a high-energy ball mill and carry out ball milling at a speed of 320r / min for 45 hours;

[0034] (3): Pickling the raw materials after ball milling in step (2), using aqua regia for pickling;

[0035] (4): The raw material after pickling in step (3) is heated at a temperature of 800°C and a vacuum of 1×10 -2 Under the condition of Pa, carry out high-temperature vacuum treatment for 60 minutes, then use molybdenum, tantalum, niobium, and platinum to ...

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Abstract

The invention discloses a method for preparing high-density hafnium diboride ceramics. After the hafnium diboride powder is subjected to high-energy ball milling, pickling, vacuum treatment, and high-melting point packaging material packaging and pre-pressing, the hafnium diboride powder is heated at 3-15GPa, 600~ Under the condition of 2000℃, it can be directly sintered into high-density hafnium diboride ceramics. For the first time, the present invention uses a high temperature and high pressure method to prepare a high-density pure-phase hafnium diboride block material with good crystal morphology and microstructure, which has small grain size, high crystallinity, high density, and stable structure. Features and high hardness and excellent fracture toughness. Because of its simple preparation process and high melting point, high strength, high hardness, high toughness and high oxidation resistance, it is developing into a new type of high-temperature structural ceramic material, which can be used as a candidate material for high-temperature resistant parts of aircraft engines, and can also be developed It is a new type of cemented carbide that can replace tungsten carbide carbide tools and is widely used in the field of mechanical cutting.

Description

technical field [0001] The invention relates to a high-density hafnium diboride ceramic, which belongs to the field of high-temperature structural ceramics and hard alloys thereof, in particular to a method for preparing high-density hafnium diboride ceramics. Background technique [0002] Ultrahigh-Temperature Ceramics (UHTCs for short) is a class of materials that can maintain chemical stability in high-temperature environments (above 2000 ° C) and reaction atmospheres (such as atomic oxygen environments), usually including borides, carbides, High melting point transition metal compounds including oxides. Among these high melting point transition metal compounds, HfB 2 The melting points of , HfC, TaC, etc. exceed 3000°C, which makes them have great application potential under extreme conditions. The high electron concentration of transition metals makes them have a large bulk modulus and the ability to resist elastic deformation, but because the formation of metal bonds...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/622
CPCC04B35/58078C04B35/622C04B2235/6567C04B2235/6581C04B2235/96
Inventor 彭放梁浩
Owner SICHUAN UNIV
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