Ceramic composite material and preparation method thereof

A ceramic composite material and composite powder technology, applied in the field of ceramic composite material and its preparation, A2B2O7-C ceramic composite material and its preparation, can solve the problem that the thermal barrier coating cannot meet the requirements of high temperature use, low photon thermal conductivity, Improve thermal conductivity and other issues, achieve good high temperature chemical stability, simple process, stable high temperature chemical properties

Active Publication Date: 2014-04-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the prior art 2 B 2 o 7 The thermal conductivity of ceramic materials increases due to photon heat conduction at high temperatures, so that the thermal barrier coating prepared from this material cannot meet the needs of high temperature use. One of the purposes of the present invention is to provide a ceramic composite material. The ceramic composite material is A 2 B 2 o 7 -C ceramic composite material with low photon thermal conductivity and stable chemical properties at high temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Select ZrOCl with a purity of 99.9% 2 ·8H 2 O and La with a purity of 99% 2 o 3 As raw material, La was synthesized by chemical co-precipitation method 2 Zr 2 o 7 Powder.

[0028] (2) MoSi with a purity of 99.9% and a particle size of 1 μm 2 Incorporate the La prepared in step (1) with a volume fraction of 10% 2 Zr 2 o 7 In the powder, a mixed powder is obtained; the mixed powder is ball milled and mixed for 4 hours using a planetary ball mill, the ball-to-material ratio is 4:1, and the ball milling speed is 400r / min to obtain MoSi 2 in la 2 Zr 2 o 7 Evenly distributed La in 2 Zr 2 o 7 -MoSi 2 Composite powder.

[0029] (3) La prepared by step (2) 2 Zr 2 o 7 -MoSi 2The composite powder is put into a hot-press sintering mold, placed in a hot-press sintering furnace, the heating rate is 5°C / min, and a pressure of 80Mpa is applied at 1250°C. Under an argon protective atmosphere, hot-press sintering is carried out for 60 minutes, and then cooled wit...

Embodiment 2

[0031] (1) Select ZrOCl with a purity of 99.9% 2 ·8H 2 O and Gd with a purity of 99% 2 o 3 As raw material, Gd was synthesized by chemical co-precipitation method 2 Zr 2 o 7 Powder.

[0032] (2) SiC with a purity of 99.9% and a particle size of 15 μm is mixed with the Gd prepared in step (1) at a volume fraction of 15% 2 Zr 2 o 7 In the powder, a mixed powder was obtained; the mixed powder was ball milled and mixed for 6 hours using a planetary ball mill, the ball-to-material ratio was 4:1, and the ball milling speed was 400r / min to obtain SiC in Gd 2 Zr 2 o 7 Evenly distributed Gd in 2 Zr 2 o 7 -SiC composite powder.

[0033] (3) Gd prepared by step (2) 2 Zr 2 o 7 - SiC composite powder is put into a hot-press sintering mold, placed in a hot-press sintering furnace, the heating rate is 8°C / min, and a pressure of 30Mpa is applied at 1400°C, under an argon protective atmosphere, hot-press sintering for 30min, and then cooled with the furnace , to obtain SiC-do...

Embodiment 3

[0035] (1) Select ZrOCl with a purity of 99.9% 2 ·8H 2 O and Dy with 99% purity 2 o 3 As raw material, Dy was synthesized by chemical co-precipitation method 2 Zr 2 o 7 Powder.

[0036] (2) SiO with a purity of 99.9% and a particle size of 35 μm 2 Incorporate the Dy prepared in step (1) with a volume fraction of 2% 2 Zr 2 o 7 In the powder, a mixed powder was obtained; the mixed powder was ball-milled and mixed for 6 hours using a planetary ball mill, the ball-to-material ratio was 4:1, and the ball-milling speed was 400r / min to obtain SiO 2 in Dy 2 Zr 2 o 7 Dy evenly distributed in 2 Zr 2 o 7 -SiO 2 Composite powder.

[0037] (3) Dy prepared by step (2) 2 Zr 2 o 7 -SiO 2 The composite powder is put into a hot-press sintering mold, placed in a hot-press sintering furnace, the heating rate is 10°C / min, and a pressure of 20Mpa is applied at 1400°C. Under an argon protective atmosphere, hot-press sintering is carried out for 30 minutes, and then cooled with t...

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Abstract

The invention relates to a ceramic composite material and a preparation method thereof. The material is an A2B2O7-C ceramic composite material, wherein A is Sc, Y, La, Nd, Eu, Gd, Dy, Er, Yb or Lu, B is Zr, Hf, Ce or Ti, C is SiO2, SiC, MoSi2 or PMMA, the volume fraction of C is greater than 0% and no more than 15% and the particle size of C is 1 to 35mu m; the material has low thermal conductivity of photons and stable chemical properties at high temperature. The method comprises the following steps: preparing A2B2O7 powder from ZrOCl2.8H2O with a purity of no less than 99% and rare earth oxide by using a chemical co-precipitation process; mixing C with a purity of no less than 99% with A2B2O7 powder so as to prepare A2B2O7-C composite powder; and sintering A2B2O7-C composite powder at a temperature of 1200 to 1600 DEG C in an inert gas atmosphere for 20 to 60 min so as to obtain the material. The method is simple and is suitable for industrial popularization.

Description

technical field [0001] The present invention relates to a kind of ceramic composite material and preparation method thereof, specifically, to a kind of A 2 B 2 o 7 The -C ceramic composite material and a preparation method thereof belong to the field of new materials. Background technique [0002] In recent years, thermal barrier coating technology has been widely used in various high-temperature heat engines, such as the surface of the rotor or stator vane of a gas turbine or a jet, the inner wall of an engine combustion chamber, the inner wall of a gasoline or diesel engine combustion engine, the inner wall of a rocket nozzle or some other high-temperature burners . Thermal barrier coating materials are required to have the characteristics of high melting point, low thermal conductivity, relatively high thermal expansion coefficient, high temperature phase stability, and low sintering shrinkage. Currently widely used thermal barrier coating materials are mainly 7-8wt% ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/622
Inventor 刘玲王富耻孙英超马壮
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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