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標題Title: Spark plasma sintering of tungsten/graphite joints with a SiC ceramic interlayer
作者Authors: 張博翔
上傳單位Department: 機械工程系
上傳時間Date: 2015-6-19
上傳者Author: 張博翔
審核單位Department: 機械工程系
審核老師Teacher: 戴子堯
檔案類型Categories: 課堂報告In-class Report
關鍵詞Keyword: SPS,Tungsten,Graphite,SiC
摘要Abstract: Tungsten powders were successfully sintered and simultaneously joined to a graphite disk using an interlayer of SiC ceramic powder,which contained Al2O3 and Y2O3 as sintering aids for the SiC.The tungsten/graphite joints were prepared at30MPa and temperatures ranging from 1700 1C to2000 C for 5min using spark plasma sintering(SPS).The tensile strength of the joints prepared at1700 1C reached 21MPa.The suggested joining mechanism of the joints prepared below 1800 C is as follows:both the sintered W metal layer and the SiC ceramic interlayer are chemically bonded together accompanying reaction phases of WC,W2C andW5Si3. A physical bond is achieved between the SiC interlayer
and graphite when the SiC powder fills the open pores of the graphite and is sintered there.Although a similar joining mechanism is suggested when the joining temperature exceeds1900 C, the SiC interlayer disappears,and the broad reaction layer consisting of WC,W2C and trace W5Si3 is formed.

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2015_6_162146e5.ppt 2002Kb ppt 67 6
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