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Method for sintering aluminum oxide-based eutectic ceramic composite material by adopting discharge plasmas

A technology of ceramic composite materials and discharge plasma, which is applied in the field of large-sized bulk alumina-based eutectic ceramic composite materials, can solve the problems of limiting material properties, uneven structure of sintered body, uneven microstructure, etc. Large, shorten the sintering time, eliminate the effect of grain boundary and interface amorphous phase

Active Publication Date: 2017-09-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the inhomogeneous microstructure of the initial eutectic sample in the prior art, resulting in the inhomogeneous structure of the sintered body, which will limit the performance of the material, the present invention proposes a spark plasma sintered alumina-based eutectic Ceramic Composite Methods

Method used

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  • Method for sintering aluminum oxide-based eutectic ceramic composite material by adopting discharge plasmas
  • Method for sintering aluminum oxide-based eutectic ceramic composite material by adopting discharge plasmas
  • Method for sintering aluminum oxide-based eutectic ceramic composite material by adopting discharge plasmas

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Embodiment 1

[0049] This implementation is a preparation of Al 2 o 3 / YAG bulk eutectic ceramic composite material, the specific process includes the following steps:

[0050] 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 polyvinyl alcohol.

[0051] Dr...

Embodiment 2

[0067] This implementation is a preparation of Al 2 o 3 / YAG / ZrO 2 A method for a bulk eutectic composite ceramic material, the specific process comprising the following steps:

[0068] 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. 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 100 ml of purifi...

Embodiment 3

[0085] This implementation is a preparation of Al 2 o 3 / YAG / ZrO 2 A method for a bulk eutectic composite ceramic material, the specific process comprising the following steps:

[0086] 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. 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 13ml 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 100 ml of purifi...

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Abstract

The invention relates to a method for sintering an aluminum oxide-based eutectic ceramic composite material by adopting discharge plasmas. The method comprises the following steps: preparing a bar-shaped eutectic sample with fine and uniform organizations by utilizing a laser suspension zone molten directional solidification technology; obtaining eutectic powder internally containing a eutectic structure through crushing and screening; sintering and preparing the aluminum oxide-based eutectic ceramic composite material internally keeping the eutectic structure by adopting the discharge plasmas. The sintered eutectic composite material prepared by the method provided by the invention keeps the eutectic structure in an initial eutectic sample and eliminates most of grain boundaries and interface amorphous phases, so that a new concept is provided for the preparation of the aluminum oxide-based eutectic ceramic composite material with large size. The organizations obtained by the invention have typical 'hieroglyphic' eutectic appearances, the grain sizes of eutectic particles are distributed between 4-12 [mu]m and are larger than a eutectic layer space, and the eutectic structure in the initial eutectic sample can be effectively kept inside the particles. As the sintering time is short, the organization growing-up in the sintering process is effectively inhibited, and eutectic ceramics with uniform and fine organizations are favorably obtained.

Description

technical field [0001] The invention relates to the field of ultra-high-temperature structural ceramics, in particular to preparing large-sized bulk alumina-based eutectic ceramic composite materials by spark plasma sintering eutectic powder with a eutectic structure inside. [0002] technical background [0003] 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, ...

Claims

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Application Information

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IPC IPC(8): C04B35/117C04B35/119C04B35/44C04B35/488C04B35/626C04B35/64
CPCC04B35/117C04B35/119C04B35/44C04B35/4885C04B35/6261C04B35/62645C04B35/62665C04B35/64C04B2235/3224C04B2235/3225C04B2235/656C04B2235/6562C04B2235/6567C04B2235/666
Inventor 苏海军任俊飞张军刘林黄太文郭敏傅恒志
Owner NORTHWESTERN POLYTECHNICAL UNIV