ZrC-SiC-LaB6 ternary superhigh temperature ceramic composite material and preparation method thereof

A technology for ultra-high temperature ceramics and composite materials, applied in the field of ultra-high temperature ceramic composite materials and their preparation, can solve the problems of high brittleness, poor ablation performance, and low density of ZrC ceramics, achieve structural integrity, improve mechanical properties, and improve effect of density

Inactive Publication Date: 2012-09-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention solves the problems of high brittleness, low density, low strength, low toughness and poor ablation performance o

Method used

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  • ZrC-SiC-LaB6 ternary superhigh temperature ceramic composite material and preparation method thereof
  • ZrC-SiC-LaB6 ternary superhigh temperature ceramic composite material and preparation method thereof
  • ZrC-SiC-LaB6 ternary superhigh temperature ceramic composite material and preparation method thereof

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specific Embodiment approach 1

[0020] Specific implementation mode one: this implementation mode ZrC-SiC-LaB 6 The ternary ultra-high temperature ceramic composite material consists of 60% to 85% ZrC powder, 5% to 14% SiC nanoparticles, 5% to 14% SiC whiskers and 5% to 12% LaB according to the volume fraction. 6 Powder composition.

[0021] In this embodiment, ZrC-SiC-LaB 6 A preferred composition of the ternary ultra-high temperature ceramic composite material is: by volume fraction 70% ZrC powder, 10% SiC nanoparticles, 10% SiC whiskers and 10% LaB 6 Made from powder.

[0022] The beneficial effects of this embodiment are: this embodiment adds SiC nanoparticles, SiC whiskers and LaB 6 The powder, SiC nanoparticles and SiC whiskers play the role of SiC nanoparticles and SiC whiskers mixed and toughened ZrC-based ultra-high temperature ceramic composites, thereby improving the mechanical properties of the ceramics. LaB 6 The powder acts as a sintering aid and improves ablation performance, LaB 6 The p...

specific Embodiment approach 2

[0023] Specific implementation mode two: this implementation mode ZrC-SiC-LaB 6 The preparation method of the ternary ultra-high temperature ceramic composite material is carried out according to the following steps:

[0024] 1. Weigh 60%-85% ZrC powder, 5%-14% SiC nanoparticles, 5%-14% SiC whiskers and 5%-12% LaB by volume fraction 6 powder;

[0025] 2. Using absolute ethanol as a dispersant, disperse the SiC whiskers weighed in step 1 by ultrasonic waves to obtain evenly dispersed SiC whiskers;

[0026] 3. Combine the uniformly dispersed SiC whiskers obtained in step 2 with the ZrC powder, SiC nanoparticles and LaB obtained in step 1 6 After the powder is mixed, it is added to a ball mill, with absolute ethanol as a dispersant, ZrO 2 The ball is used as the ball milling medium, and the ball mill is mixed evenly to obtain the slurry;

[0027] 4. Using a rotary evaporator to dry the slurry obtained in step 4 to obtain a mixed powder;

[0028] 5. Put the mixed powder obtai...

specific Embodiment approach 3

[0037] Specific embodiment three: the difference between this embodiment and specific embodiment two is: the method for ultrasonic dispersion treatment in step two is carried out according to the following steps: with absolute ethanol as dispersant, the consumption ratio of SiC whisker and absolute ethanol is 1g : (5mL ~ 35mL), under the conditions of working voltage of 220V and frequency of 20 ~ 25kHz, ultrasonic treatment for 3min ~ 10min. Others are the same as in the second embodiment.

[0038] In this embodiment, the ratio of SiC whiskers to absolute ethanol is preferably 1 g: 20 mL.

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Abstract

The invention provides a ZrC-SiC-LaB6 ternary superhigh temperature ceramic composite material and a preparation method thereof, relates to a superhigh temperature ceramic composite material and a preparation method thereof, and mainly solves the problem that the existing ZrC ceramic is large in fragility, low in density, strength and rigidity, and poor in erosion performance. The method is as follows: performing ultrasonic dispersion on SiC crystal whisker, mixing the SiC crystal whisker with ZrC and SiC nano particles and LaB6, then performing ball milling on mixture to obtain slurry, and drying the slurry to obtain mixed powder; and filling the mixed powder into a graphite mould, performing hot-press sintering on the mixed powder under the protection argon, so as to obtain the ceramic of which the density is more than or equal to 98%, wherein the mass ablation rate is 0.74-1.11*10<-4>g/s, and the linear ablation rate is 1.50-2.78*10<-3>mm/s. The material is used for throat liner nozzle jets and jet vanes of solid rocket engines, nose cones and leading edges of superspeed air vehicles, cladded fuel particle coatings of high-temperature gas cooled reactors, coatings of thermophotovoltaic radiators, and the like.

Description

technical field [0001] The invention relates to an ultra-high temperature ceramic composite material and a preparation method thereof. Background technique [0002] As a kind of refractory metal carbide, ZrC has excellent characteristics such as high melting point, high hardness, stable chemical properties and anti-ablation, etc. Nose cone, wing leading edge and other high temperature resistant structural parts, high temperature gas-cooled reactor coated fuel particle coating, thermal photoelectric radiator coating, etc. However, single-phase ZrC ceramics, like other ceramics, have the disadvantages of high brittleness, low density, low strength, low toughness, and poor ablation performance. Contents of the invention [0003] The present invention solves the problems of high brittleness, low density, low strength, low toughness and poor ablation performance of existing ZrC ceramics, and provides a ZrC-SiC-LaB 6 Ternary ultra-high temperature ceramic composite material an...

Claims

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Application Information

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IPC IPC(8): C04B35/81C04B35/56C04B35/622
Inventor 李金平孟松鹤王智博张宇民周玉锋
Owner HARBIN INST OF TECH
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