Gradient heat prevention/insulation ceramic base composite material and preparation method thereof

A composite material and ceramic-based technology, which is applied in the field of ceramic-based composite materials and its preparation, can solve the problem of single thermal conductivity, etc., and achieve the effects of simple preparation process, avoiding damage to material properties, and relieving thermal stress

Inactive Publication Date: 2009-03-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of single thermal conductivity of the existing boride ceramic matrix homogeneous composite material, and to provide a gradient anti / heat insulation ceramic matrix composite material and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0009] Specific Embodiment 1: In this embodiment, the gradient anti- / heat-insulating ceramic matrix composite material is composed of a heat-resistant layer, a first intermediate transition layer, a second intermediate transition layer, a third intermediate transition layer, and a heat-insulating layer, wherein the heat-resistant layer It is made of 80% boride and 20% silicon carbide by volume; the first intermediate transition layer is made of 80% boride, 10% silicon carbide and 10% zirconia by volume; the second intermediate The transition layer is made of 70% boride and 30% zirconia by volume; the third intermediate transition layer is made of 50% boride and 50% zirconia by volume; the heat insulation layer is made of 10% boride and 90% zirconium oxide; the boride is zirconium boride or hafnium boride, the thickness of the heat protection layer, the thickness of the first intermediate transition layer, the thickness of the second intermediate transition layer, the third The...

specific Embodiment approach 2

[0011] Specific embodiment two: The preparation method of the gradient anti- / heat-insulating ceramic matrix composite material in this embodiment is as follows: 1. Put the raw material powders of each layer into absolute ethanol and ultrasonically clean them for 10-30 minutes, and then use 150 Perform planetary ball milling at a rate of ~250r / min, and then dry at 50-80°C for 60-120 minutes; 2. Put the mixed powder of each layer after step 1 into heat-proof layer, first intermediate transition layer, The order of the second intermediate transition layer, the third intermediate transition layer and the thermal insulation layer is tiled in a graphite mold to obtain a gradient layered mixture; 3. When the degree of vacuum is 10 -3 Pa, under the condition of inert gas pressure of 20-50MPa, heat the gradient layered mixture to 1750-1850°C at a rate of 100-150°C / min, keep it warm for 5 minutes, cool to room temperature and take it out. The heat-proof layer It is made of 80% boride an...

specific Embodiment approach 3

[0013] Embodiment 3: The difference between this embodiment and Embodiment 2 is that in step 1, drying is carried out at a temperature of 51-60°C. Others are the same as in the second embodiment.

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Abstract

The invention discloses a gradient heat shielding/heat insulating ceramic matrix composite material and a preparation method thereof, and relates to a ceramic matrix composite material and a preparation method thereof. The invention solves the problem of single heat conductivity of the existing boride ceramic matrix homogeneous composite material, and provides a gradient heat shielding/heat insulating ceramic matrix composite material and a preparation method thereof. The material of the invention consists of a heat shielding layer, a first intermediate layer, a second intermediate layer, a third intermediate layer and a heat insulating layer. The preparation method of the material of the invention comprises the following steps: raw material powder treated with ultrasonic cleaning, ball-milling and drying and used for preparing all the layers are laid in a graphite mould in a flat way according to the sequence, then, under the condition of inert atmosphere, the temperature of the mixture is raised and maintained for 5min to obtain the material. The preparation technology of the invention is simple, the cost is low, the room temperature heat conductivity of the heat shielding end of the invention is 89.77W/m per DEG C, the heat conductivity at 1800 DEG C is 61.86W/m per DEG C; while the room temperature heat conductivity of the heat insulating end can reach 8.58W/m per DEG C minimally; and the heat conductivity at 1800 DEG C can reach 18.27W/m per DEG C minimally.

Description

technical field [0001] The invention relates to a ceramic matrix composite material and a preparation method thereof. Background technique [0002] Borides have high melting point, high thermal conductivity, high electrical conductivity, good chemical stability and thermal shock resistance; currently ZrB 2 The boride ultra-high temperature ceramic material system represented by -SiC has attracted the attention of many international scholars, but the existing technologies are all boride ceramic matrix homogeneous composite materials, which are characterized by a single thermal conductivity. In the actual service environment, the end of the material that is in direct contact with the service environment requires excellent heat resistance, while the other end that is in contact with other devices requires the material to have a certain heat insulation performance, so as to prolong the service life of the overall component. It can be seen that the integrated problem of the anti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/48C04B35/622
Inventor 张幸红李伟杰韩杰才孟松鹤洪长青
Owner HARBIN INST OF TECH
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