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Joining of ZrO2 Ceramics by Microwave Sintering with SiC

Author: LiuLanLan
Tutor: LiuJiaChen；ZhangXiaoHang
School: Tianjin University
Course: Materials Engineering
Keywords: Microwave Connection ZrO2 SiC
CLC: TQ174.75
Type: Master's thesis
Year: 2010
Downloads: 15
Quote: 0
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Abstract


ZrO 2 ceramic microwave connection . SiC their oxides different microwave absorption characteristics , and SiC formed by oxidation of the chemical reaction of SiO2 interface partial connection is first heated in the microwave processing conditions . Designed SiC-containing component connected by the connection of different heating power and holding time under phase composition and microstructure analysis that SiC can strongly absorb microwaves, the connection phase of the pre - heated and starts where the oxide absorbs the microwave , polar the large to improve the connection phase of the heating rate . The SiC content changes the role of the microwave very sensitive . SiC and the microwave source power , holding time interaction affect the rate of temperature increase of the sample , strongly promotes the synthesis of mullite . Connection selected on the basis of this analysis 55wt% SiC content formula C ZrO 2 < / sub > ceramic microwave 3000W and speed of 1KW/20min to obtain the ideal connection effect . Which is characterized as an intermediate layer dense, viscous flow of the mass transfer of the silicon oxide of silicon carbide oxidation products to promote the combination of the intermediate phase and matrix interface ; experiments show that the use of micro- pressure connection , the connecting surface between the docking effect is controlled by controlling the thickness of the connection layer the silicon carbide in the amount of expansion of the expansion generated in the connection layer , and conducive to the exclusion of the connection layer stomatal connection good results connection layer can be obtained . Experimental results show that : the material connection mechanism for diffusion bonding under microwave irradiation . SiC-Al2O3 component middle term under microwave irradiation of ZrO 2 sintered body can be effective connection . ZrO 2 -SiC system , as the connection phase , SiC content is too small will lead to the sintering temperature is too low , so that the connection failed ; too much in the middle phase to produce excessive temperatures and excessive The gas thus affecting the connection effect . The microwave power is too low will result in the intermediate phase can not be improved to a sufficient temperature embodiment connection , microwave power is too high will result in melting of the connecting sample . The state of the micro-pressure better docking connector , can effectively control the amount of expansion , conducive to mesophase stomata exclusion , effectively improve the connection performance .

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CLC: > Industrial Technology > Chemical Industry > Silicate > Ceramic Industry > Ceramics > Industrial ceramic
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