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Method for preparing composite ceramic material through utilizing ceramic and precursor

A technology of multiphase ceramics and precursors, which is applied in the field of preparing multiphase ceramic materials by using ceramic precursors, can solve the problems of high cost, low production efficiency, difficulty in preparing complex special-shaped parts, etc., and achieves the effects of improving dispersion and reducing manufacturing costs.

Active Publication Date: 2013-03-13
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, this type of method is mainly based on hot press sintering, which is carried out on a hot press at 1900-2000°C and 30-40Mpa. The production efficiency is low, the cost is high, and the material properties have obvious anisotropy, and are restricted. Due to the limitation of hot pressing equipment, it is very difficult to prepare complex special-shaped parts

Method used

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  • Method for preparing composite ceramic material through utilizing ceramic and precursor
  • Method for preparing composite ceramic material through utilizing ceramic and precursor

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A kind of method utilizing ceramic precursor to prepare multiphase ceramic material according to the present invention, it comprises the following steps:

[0022] (1) Under the protection of argon, dissolve 2 grams of solid borazine polymer in 20 ml of n-hexane, then add 10 grams of titanium boride (2 microns) into the above solution, mix well and remove the n-hexane solvent ;

[0023] (2) Curing the material mixed in step (1) in a vacuum drying oven, the curing temperature is 120°C, and the holding time is 10h;

[0024] (3) The solidified product of step (2) is molded for initial molding of the green body. The molding temperature is at room temperature and the pressure is 10Mpa; then the green body is further densified by cold isostatic pressing. The pressure of the isostatic pressing is 200Mpa and the temperature is at 300°C;

[0025] (4) Machining the green body obtained in step (3) to a net final size by means of mechanical processing;

[0026] (5) Sinter the pro...

Embodiment 2

[0028] A kind of method utilizing ceramic precursor to prepare multiphase ceramic material according to the present invention, it comprises the following steps:

[0029] (1) Dissolve 2 grams of polysiloxane in 10 milliliters of toluene, then add 10 grams of alumina (1 micron) and 0.4 grams of divinylbenzene, ultrasonically blend and remove the solvent;

[0030] (2) Curing the material mixed in step (1) in a vacuum drying oven, the curing temperature is 200°C, and the holding time is 3h;

[0031] (3) The solidified product of step (2) is molded for initial molding of the green body. The molding temperature is 300°C and the pressure is 5Mpa; then the green body is further densified by cold isostatic pressing. The pressure of the isostatic pressing is 100Mpa and the temperature at 700°C;

[0032] (4) Machining the green body obtained in step (3) to a net final size by means of mechanical processing;

[0033] (5) Air pressure sintering is carried out on the product obtained in s...

Embodiment 3

[0035] A kind of method utilizing ceramic precursor to prepare multiphase ceramic material according to the present invention, it comprises the following steps:

[0036] (1) Dissolve 2 grams of polysiloxane in 10 milliliters of toluene, then add 10 grams of alumina (1 micron) and 0.4 grams of divinylbenzene, ultrasonically blend and remove the solvent;

[0037] (2) Curing the material mixed in step (1) in a vacuum drying oven at a curing temperature of 500°C and a holding time of 1 hour;

[0038] (3) The solidified product in step (2) is molded for the initial molding of the green body. The molding temperature is 100°C and the pressure is 50Mpa; then the green body is further densified by cold isostatic pressing, and the pressure of cold isostatic pressing is 300Mpa. , the temperature is room temperature;

[0039] (4) Machining the green body obtained in step (3) to a net final size by means of mechanical processing;

[0040] (5) Perform pressureless sintering on the product...

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Abstract

The invention provides a method for preparing a composite ceramic material through utilizing ceramic and a precursor. The method comprises the steps that (1) ceramic powder and the precursor are mixed uniformly; (2) the mixture material is solidified, wherein the solidifying temperature is between 120 and 500 DEG C, and the thermal insulation time is between 0.5 and 10 hours; (3) the solidified product is subjected to die pressing so as to preform a body, and then, the body is further densified through isostatic pressing; (4) the body is subjected to net final dimension processing through adopting a mechanical processing mode; and (5) the processed product is sintered in a sintering furnace, so that the composite ceramic product is finally obtained, wherein the sintering pressure is between 100 pascals and 10 mega pascals, the sintering temperature is between 1600 and 2200 DEG C, and the sintering time is between 0.5 and 10 hours. A precursor polymer has plasticity and plays a role of a 'plasticizer' during the body forming process; and moreover, the 'plasticizer' can be directly converted into a component which is required by composite ceramic through cracking during the subsequent high-temperature processes, other impurities cannot be brought in, and the dispersion of all the components can be effectively improved.

Description

technical field [0001] The invention relates to a method for using a ceramic precursor as a "plasticizer" for forming a high-temperature-resistant composite phase ceramic and preparing a ceramic material. Background technique [0002] Traditional heat protection mostly uses chemical or physical methods to take away the heat generated by pneumatic heating through the radiation, ablation, sweating and other mechanisms of materials, or achieve the purpose of heat protection through active cooling mechanisms. With the new approaching space vehicles, the existing heat-resistant material system has higher and higher requirements in terms of temperature resistance, oxidation resistance, energy dissipation efficiency and effective service time; at the same time, under extreme aerodynamic heating conditions Key components, such as the passivation caused by ablation of the tip and sharp leading edge, will inevitably affect the lift-to-drag ratio of the aircraft, and will have a great ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/515C04B35/622
Inventor 李军平赵彦伟刘宏瑞胡继东周延春
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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