A metal-ceramic matrix composite material for long-term use below 2000 °C

A composite material and ceramic matrix technology, applied in the field of composite materials, can solve problems such as performance degradation, and achieve the effects of small residual stress, high fiber volume fraction, and small fiber damage

Active Publication Date: 2016-05-04
TAICANG PAIOU TECH CONSULTING SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the commonly used ceramic fibers can be used for a long time at high temperatures (>1200°C), and most of them begin to change at 1000°C. For example, NICALON fibers creep at high temperatures, and the oxygen in the fibers Chemical reaction with free carbon, reducing its performance

Method used

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  • A metal-ceramic matrix composite material for long-term use below 2000 °C
  • A metal-ceramic matrix composite material for long-term use below 2000 °C
  • A metal-ceramic matrix composite material for long-term use below 2000 °C

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 30% of the carbon fiber with a diameter of 5 μm and 70% of the chopped niobium-tungsten alloy wire with a length of 10 cm are plied and twisted in the form of staggered lap joints. The diameter of the alloy wire is distributed within the range of 10 μm to 100 μm. The twisted fiber is woven into a three-dimensional preform, and the total fiber content is controlled to 50%; the molybdenum silicide anti-oxidation coating and the carbon interface layer are successively prepared by the CVI method, and the relevant process parameters are controlled so that the thickness of the molybdenum silicide anti-oxidation coating is 0.5 μm , The thickness of the interface layer is 0.3 μm; then in the same CVI equipment, trichloromethylsilane is used as the precursor, and SiC is decomposed under appropriate conditions to fill the gaps of the preform densely to form a metal-ceramic composite material.

Embodiment 2

[0023] 40% of the boron fibers with a diameter of 7 μm and 60% of the chopped niobium-tungsten alloy wires with a length of 6 cm are plied and twisted in the form of staggered lap joints. The diameters of the alloy wires are distributed within the range of 1 μm to 50 μm. The twisted fiber is woven into a three-dimensional preform, and the total fiber content is controlled to 70%; firstly, palladium is infiltrated into the alloy wire of the preform through double-glow plasma technology, and the infiltrated element content is controlled at about 1%, and then BN is prepared by the CVI method The thickness of the interface layer is controlled to be 0.5 μm; and then the silicon carbide and carbon mixed ceramic matrix is ​​prepared by the CVI method, and finally a cermet matrix composite material is formed.

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Abstract

The invention discloses a metal ceramic matrix composite used at the temperature of below 2000 DEG C for a long term. The metal ceramic matrix composite is characterized by being composed of inorganic fibers, an alloy wire and a ceramic matrix. The inorganic fibers are carbon fibers, boron fibers, silicon carbide fibers or mixed fibers thereof, and the diameter of the inorganic fiber is 4-8mu m. The alloy wire is a high-temperature alloy wire such as a niobium-tungsten alloy wire, a tungsten-molybdenum alloy wire or a tungsten-rhenium alloy wire and the like and mainly contains elements such as Nb, W, Mo, Re, Ni and the like, and the diameter of the alloy wire is 0.01-0.5mm. The ceramic matrix is a mixed matrix of silicon carbide, silicon carbide and carbon or a mixed matrix of zirconium carbide and carbon, wherein a preform is formed by knitting continuous carbon fibers and one or more of a chopped niobium-zirconium alloy wire, the niobium-tungsten alloy wire, the tungsten-molybdenum alloy wire, the tungsten-rhenium alloy wire and any other high-temperature alloy wires in a staggered lapping way. The modified high-temperature alloy wire is mixed with knitted carbon fibers to serve as a strengthening and toughening phase of the metal ceramic matrix composite, so that the high-performance oxidation property of a fiber material and the integral toughness of the composite are improved.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a metal-ceramic matrix composite material used for a long time below 2000C. Background technique [0002] Ceramic materials have excellent properties such as high temperature resistance, low density, high specific strength, high specific modulus, oxidation resistance and ablation resistance, making them have the potential to replace metals as a new generation of high-temperature structural materials. However, the fatal weaknesses of ceramic materials such as high brittleness and poor reliability hinder its practical application. The inherent brittle nature of ceramic materials can be improved by controlling grains and phase transformation toughening, and fiber reinforcement has always been one of the means that has received widespread attention. [0003] The principle of fiber-reinforced ceramics is to add high-strength and high-modulus fibers to the ceramic matrix, so that th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/76C04B35/56C04B35/565C04B35/52C04B35/622
Inventor 陈照峰聂丽丽
Owner TAICANG PAIOU TECH CONSULTING SERVICE
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