SiC whisker reinforced SiC ceramic matrix composite and preparation method thereof

A composite material and ceramic-based technology, which is applied in the field of preparation of ceramic-based composite materials to achieve the effects of low temperature, high utilization rate and wide source of raw materials

Inactive Publication Date: 2011-08-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned methods all disclose the method for preparing silicon carbide whiskers from rice husks, but for the application of prepared silicon carbide whisker-containing products, there are still relatively few relevant publications

Method used

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  • SiC whisker reinforced SiC ceramic matrix composite and preparation method thereof
  • SiC whisker reinforced SiC ceramic matrix composite and preparation method thereof
  • SiC whisker reinforced SiC ceramic matrix composite and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Sieve the rice husk to remove soil and other impurities, then wash it with water and dry it. Put an appropriate amount of dry rice husks in a graphite crucible, and carry out coking treatment at 900° C. for 2 hours under an Ar atmosphere. Grind and pulverize the coking-treated product, then place it in a graphite crucible, and in a graphite sintering furnace under Ar atmosphere, heat it at 1550°C for 6 hours to obtain SiC whiskers and particles, some carbon and silicon oxide (mainly SiO 2 ) of the product. The product rich in SiC whiskers and particles is pulverized and dispersed by ball milling in absolute ethanol as a medium, then dried, passed through a 60 mesh sieve, then added with a polyvinyl alcohol aqueous solution binder, stirred evenly, and dried. The body is granulated. Take an appropriate amount of granulated powder and press it under a uniaxial pressure of 31 MPa, and then cold isostatic pressing at 180 MPa to obtain a size of about 48×48×5.5 mm 3 prefa...

Embodiment 2

[0046] The preparation of the preform is the same as in Example 1. Place the preform on the graphite plate, and place a certain amount of silicon block on the preform, and place it in the graphite sintering furnace. In the graphite sintering furnace, infiltrate at 1450°C for 1 hour under vacuum conditions. After reaction sintering and cooling, a SiC ceramic matrix composite material strengthened by SiC whiskers is obtained. The bending strength of the composite material sample at room temperature is 440-470 MPa.

Embodiment 3

[0048] The cleaned rice husks were kept at 900°C for 2 hours under vacuum conditions for coking treatment, then ground and pulverized, and then kept at 1450°C for 6 hours for silicon carbide whisker treatment. An appropriate amount of the whisker-treated product is pulverized and dispersed by a ball mill, then added with a polyvinyl alcohol aqueous solution binder, stirred evenly, dried, and granulated. Then it was molded under uniaxial compression at 80 MPa to obtain a size of about 48×48×6 mm 3 . The prefabricated part is subjected to heat preservation at 400° C. for 60 minutes under vacuum and treatment for removal of volatile substances (including binder removal). Then place the prefabricated part after the binder removal process on the graphite plate, and place a certain amount of Al-55wt.% Si alloy on the preformed part, in the graphite sintering furnace, under vacuum conditions, after 1300 ℃ for 1 hour to carry out the infiltration reaction. After the infiltration re...

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Abstract

The invention belongs to the field of the preparation of ceramic matrix composites, and particularly relates to a SiC whisker reinforced SiC ceramic matrix composite and a preparation method thereof. The SiC whisker reinforced SiC ceramic matrix composite is prepared from a preform through a Si or Si alloy infiltration reaction, and the preform is prepared by compressing and molding a raw material comprising a rice hull SiC whiskerized product. By the method, the preparation process is simple, the temperature of the infiltration reaction is low, external pressure is not required, and the preform can be prepared into complicate shapes and can be used for preparing members with complicated shapes. A main composition phase SiC of the composite comes from rice hull, the raw material is rich, the cost is low, the manufacturing cost of the ceramic matrix composite can be remarkably reduced, the resource is saved and the environment is protected. The SiC ceramic matrix composite has good performance, SiC whiskers have the effect of strengthening materials, and the SiC whisker reinforced SiC ceramic matrix composite can be used for applicable occasions of SiC reaction sintering ceramic material products such as sliding bearings, corrosion-resistant and wear-resistant pipelines, valves and fan blades, military and civil body armors and the like.

Description

technical field [0001] The invention belongs to the field of preparation of ceramic-based composite materials, and in particular relates to a SiC whisker-strengthened SiC ceramic-based composite material and a preparation method thereof. Background technique [0002] Silicon carbide (SiC) ceramic material is a ceramic material with silicon carbide as the main component. As a structural material, it is widely used in modern national defense, nuclear energy, space technology and machinery industry due to its high temperature strength, good oxidation resistance, high thermal conductivity, high hardness, wear resistance and chemical corrosion resistance. and other fields. The main preparation methods of SiC ceramic materials include hot pressing sintering, hot isostatic pressing sintering, atmospheric pressure sintering and reaction sintering. Among them, the reaction sintering process is currently a widely used preparation process due to its advantages of simple equipment, lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/81C04B35/565C04B35/622
Inventor 高明霞朱丹潘颐潘洪革刘永锋巫红燕
Owner ZHEJIANG UNIV
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