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Method for hot-pressing and sintering alumina-based eutectic composite ceramic materials

A composite ceramic and hot pressing sintering technology, applied in the field of ultra-high temperature structural ceramics, can solve the problems of affecting material properties, poor organizational uniformity, etc., and achieve the effect of eliminating grain boundaries and interfacial amorphous phases

Inactive Publication Date: 2017-08-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the poor uniformity of the structure in the sintered eutectic composite ceramics in the prior art, which affects the performance of the material performance, the present invention proposes a method for hot-pressing and sintering the alumina-based eutectic composite ceramic material

Method used

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  • Method for hot-pressing and sintering alumina-based eutectic composite ceramic materials
  • Method for hot-pressing and sintering alumina-based eutectic composite ceramic materials
  • Method for hot-pressing and sintering alumina-based eutectic composite ceramic materials

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Embodiment 1

[0047] This implementation is a hot-pressed sintered Al 2 o 3 The method for the / YAG bulk eutectic composite ceramic material, the specific process comprises the following steps:

[0048] Step 1, Al 2 o 3 / YAG eutectic autogenous composite ceramic sample preform preparation. Al with a purity of 99.99% 2 o 3 and Y 2 o 3 Powder as raw material, according to Al 2 o 3 / Y 2 o 3 For the eutectic point ratio of the phase diagram, add polyvinyl alcohol solution and absolute ethanol to the weighed mixed powder and fully mix and stir; the speed of the ball mill is 550r / min, and the stirring time is 5h to obtain a well-mixed mixture. powder. The addition amount of the polyvinyl alcohol is 15ml of polyvinyl alcohol solution per 100g of the raw material; the addition of the absolute ethanol is 50ml per 100g of the raw material. The added polyvinyl alcohol solution is obtained after adding 5 g of polyvinyl alcohol into 100 ml of purified water and heating to dissolve the polyv...

Embodiment 2

[0064] This implementation is a hot-pressed sintered Al 2 o 3 / YAG / ZrO 2 A method for a bulk eutectic composite ceramic material, the specific process comprising the following steps:

[0065] Step 1, Al 2 o 3 / YAG / ZrO 2 Preparation of eutectic autogenous composite ceramic sample preforms. Al with a purity of 99.99% 2 o 3 , Y 2 o 3 and ZrO 2 Powder as raw material, according to Al 2 o 3 / Y 2 o 3 / ZrO 2 Phase diagram eutectic point ratio.

[0066] Add polyvinyl alcohol solution and absolute ethanol to the weighed mixed powder and carry out thorough mixing and stirring; the rotating speed of the ball mill is 550r / min, and the stirring time is 5h to obtain a uniformly mixed mixed powder. The addition amount of the polyvinyl alcohol is 10ml of polyvinyl alcohol solution per 100g of the raw material; the addition of the absolute ethanol is 55ml per 100g of the raw material. The added polyvinyl alcohol solution is obtained after adding 5 g of polyvinyl alcohol into 1...

Embodiment 3

[0082] This implementation is a hot-pressed sintered Al 2 o 3 / YAG / ZrO 2 A method for a bulk eutectic composite ceramic material, the specific process comprising the following steps:

[0083] Step 1, Al 2 o 3 / YAG / ZrO 2 Preparation of eutectic autogenous composite ceramic sample preforms. Al with a purity of 99.99% 2 o 3 , Y 2 o 3 and ZrO 2 Powder as raw material, according to Al 2 o 3 / Y 2 o 3 / ZrO 2 Phase diagram eutectic point ratio.

[0084] Add polyvinyl alcohol solution and absolute ethanol to the weighed mixed powder and carry out thorough mixing and stirring; the rotating speed of the ball mill is 550r / min, and the stirring time is 5h to obtain a uniformly mixed mixed powder. The addition amount of the polyvinyl alcohol is 5ml of polyvinyl alcohol solution per 100g of the raw material; the addition of the absolute ethanol is 60ml per 100g of the raw material. The added polyvinyl alcohol solution is obtained after adding 5 g of polyvinyl alcohol into 10...

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Abstract

The invention discloses a method for hot-pressing and sintering alumina-based eutectic composite ceramic materials. The method includes the steps: preparing rod-like eutectic samples with small and uniform tissues by the aid of laser suspension zone melting-directional solidification technology; performing crushing and screening to obtain eutectic powder with inner eutectic structures; preparing the alumina-based eutectic composite ceramic materials with inner eutectic structures in a hot-pressing and sintering manner. The prepared sintering eutectic composite materials reserve eutectic structures in initial eutectic samples and eliminate most of crystal boundary and interface non-crystal phases, so that a new idea is provided for preparation of large alumina-based eutectic composite ceramic materials. According to the method, the tissues are typical 'hieroglyphic' eutectic morphologies, the particle size of eutectic particles ranges from 4mum to 25mum and larger than gaps between eutectic layer sheets, so that the eutectic particles effectively reserve eutectic structures, and the large-block eutectic composite ceramic materials are prepared, high in melting point, close to full density and provided with inner approximately full-eutectic structures.

Description

technical field [0001] The invention relates to the field of ultra-high-temperature structural ceramics, in particular to preparing large-size bulk alumina-based eutectic composite ceramic materials by hot-pressing and sintering eutectic powder with a eutectic structure inside. Background technique [0002] Due to its excellent high-temperature mechanical properties, natural oxidation resistance and low density, alumina-based composite ceramics are expected to be used as ultra-high-temperature structural materials in high-temperature oxidative environments, so they have great potential in the field of high-temperature heat-resistant components for aviation and ground gas turbines. Broad application potential. Up to now, the main preparation method of alumina-based composite ceramics is powder sintering method, but the prepared materials generally have a polycrystalline structure, and there are grain boundaries, pores, and interface amorphous phases inside the material, resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/44C04B35/505C04B35/48C04B35/645
CPCC04B35/10C04B35/44C04B35/48C04B35/505C04B35/645C04B2235/3224C04B2235/658C04B2235/665C04B2235/77
Inventor 苏海军任俊飞张军刘林黄太文郭敏杨文超傅恒志
Owner NORTHWESTERN POLYTECHNICAL UNIV
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