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Resistivity-controllable high-power-density metal ceramic resistance material and preparation method thereof

A high power density, cermet technology, applied in the field of materials, can solve the problems of low electrical conductivity and cannot be used in cermet resistance, and achieve the effect of improving mechanical properties, increasing power density, and keeping simplicity.

Active Publication Date: 2020-04-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity of titanium-silicon-carbon / alumina composite ceramics is very low and cannot be used as a cermet resistor; patent CN108686524A discloses a method for preparing a silicon carbide ceramic hollow fiber membrane reinforced and toughened by silicon carbide whiskers. Whiskers significantly improve the toughness of ceramics, but the influence of silicon carbide whiskers on percolation threshold and resistivity of ceramics is not involved

Method used

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  • Resistivity-controllable high-power-density metal ceramic resistance material and preparation method thereof
  • Resistivity-controllable high-power-density metal ceramic resistance material and preparation method thereof
  • Resistivity-controllable high-power-density metal ceramic resistance material and preparation method thereof

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Embodiment Construction

[0034] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0035] A high-power-density cermet resistance material with controllable resistivity and its preparation, according to different selected parameters, several embodiments are provided, and the specific steps of its preparation are as follows:

[0036] (1) According to the proportion of raw materials, prepare the raw material patterns with the following components respectively, and the pattern numbers and proportions are shown in Table 1. Among them, the metal phase is molybdenum, the whisker phase is titanium carbide whisker, the whisker precursor raw material and mass ratio sodium chloride: nickel: titanium dioxide: carbon = 20%: 5%: 50%: 25%;

[0037] (2) Put the raw materials into the ball milling tank, add alumina balls into the ball milling tank according to the mass ratio of material: ball = 1:2, use absolute ethanol as the ball milling med...

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Abstract

The invention discloses a resistivity-controllable high-power-density metal ceramic resistance material and a preparation method thereof. The preparation method comprises the following steps: subjecting components including 20-90% of an alumina ceramic phase, 1-35% of a metal phase, 1-50% of a whisker precursor (subjected to a reaction for production of 1-35% of whiskers) and 5-10% of a multi-element additive including calcium oxide, mullite and spinel to stirring and ball-milling, carrying out granulating and tabletting, and performing sintering in an atmosphere furnace at 1400-1600 DEG C, wherein a metal phase component comprises one selected from the group consisting of molybdenum, nickel and the like, and a whisker phase comprises one selected from the group consisting of titanium carbide, silicon carbide and the like. A prepared metal ceramic resistor has high power density and a low seepage threshold value and can tolerate high temperature and large current impact. The preparation method provided by the invention is simple to operate and has a good application value.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to resistance materials, in particular to a high power density cermet resistance material with controllable resistivity and a preparation method thereof. Background technique [0002] Ceramic materials are obtained by adding metal phases (such as molybdenum, copper, nickel, etc.) to reduce the resistivity to obtain cermets, which can obtain very low resistivity while maintaining excellent mechanical properties, and are widely used in high-power resistance materials and other fields. However, after the metal phase is added, the resistivity of the cermet is difficult to control due to the influence of the percolation threshold. At the same time, the bonding strength of the heterogeneous interface between the metal phase and the ceramic phase is poor, which reduces the mechanical properties of the cermet. The so-called percolation threshold usually refers to the volume or mass ratio of...

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Application Information

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IPC IPC(8): C04B35/81C04B35/10C04B35/622C22C49/02C22C49/14C22C101/12C22C101/14
CPCC04B35/80C04B35/10C04B35/622C22C49/02C22C49/14C04B2235/404C04B2235/524C04B2235/3208C04B2235/3463C04B2235/3222
Inventor 张昊张雪萍魏剑李雪婷
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY