粉末冶金材料科学与工程
粉末冶金材料科學與工程
분말야금재료과학여공정
POWDER METALLURGY MATERIALS SCIENCE AND ENGINEERING
2013年
5期
675-679
,共5页
梁宝岩%汪乐%王志炜%李俊鹏%郭猛%李孟洋
樑寶巖%汪樂%王誌煒%李俊鵬%郭猛%李孟洋
량보암%왕악%왕지위%리준붕%곽맹%리맹양
Ti2SC%自蔓延高温合成%反应机制
Ti2SC%自蔓延高溫閤成%反應機製
Ti2SC%자만연고온합성%반응궤제
Ti2SC%self propagation high temperature synthesis%reaction mechanism
以钛粉、硫粉和石墨粉体为原料，采用自蔓延高温合成技术(SHS)制备钛硫碳(Ti2SC)陶瓷材料，研究不同原料配比和助剂对反应合成Ti2SC的影响。利用X射线衍射仪和扫描电镜对合成产物进行物相组成和形貌分析，探讨反应合成Ti2SC材料的反应机制。研究结果表明，2Ti/S/C粉体自蔓延高温合成的产物中主相为Ti2SC，还包括少量的TiC与Ti3S4。主产物Ti2SC的晶粒有片状和板条状2种形貌。原料中添加过量的S，可抑制TiC形成，促进Ti3S4合成；添加适量的Al助剂可促进Ti2SC合成，抑制TiC和Ti3S4形成。2Ti-S-C体系的绝热燃烧温度达2398 K。Ti2SC的形成机制是：在Ti-S-C反应体系中，Ti与S首先反应形成液相Ti-S，然后Ti与C反应形成TiC，最后，液相Ti-S与TiC反应形成Ti2SC。
以鈦粉、硫粉和石墨粉體為原料，採用自蔓延高溫閤成技術(SHS)製備鈦硫碳(Ti2SC)陶瓷材料，研究不同原料配比和助劑對反應閤成Ti2SC的影響。利用X射線衍射儀和掃描電鏡對閤成產物進行物相組成和形貌分析，探討反應閤成Ti2SC材料的反應機製。研究結果錶明，2Ti/S/C粉體自蔓延高溫閤成的產物中主相為Ti2SC，還包括少量的TiC與Ti3S4。主產物Ti2SC的晶粒有片狀和闆條狀2種形貌。原料中添加過量的S，可抑製TiC形成，促進Ti3S4閤成；添加適量的Al助劑可促進Ti2SC閤成，抑製TiC和Ti3S4形成。2Ti-S-C體繫的絕熱燃燒溫度達2398 K。Ti2SC的形成機製是：在Ti-S-C反應體繫中，Ti與S首先反應形成液相Ti-S，然後Ti與C反應形成TiC，最後，液相Ti-S與TiC反應形成Ti2SC。
이태분、류분화석묵분체위원료，채용자만연고온합성기술(SHS)제비태류탄(Ti2SC)도자재료，연구불동원료배비화조제대반응합성Ti2SC적영향。이용X사선연사의화소묘전경대합성산물진행물상조성화형모분석，탐토반응합성Ti2SC재료적반응궤제。연구결과표명，2Ti/S/C분체자만연고온합성적산물중주상위Ti2SC，환포괄소량적TiC여Ti3S4。주산물Ti2SC적정립유편상화판조상2충형모。원료중첨가과량적S，가억제TiC형성，촉진Ti3S4합성；첨가괄량적Al조제가촉진Ti2SC합성，억제TiC화Ti3S4형성。2Ti-S-C체계적절열연소온도체2398 K。Ti2SC적형성궤제시：재Ti-S-C반응체계중，Ti여S수선반응형성액상Ti-S，연후Ti여C반응형성TiC，최후，액상Ti-S여TiC반응형성Ti2SC。
The Ti2SC was synthesized by self-propagation high temperature synthesis (SHS) using Ti/S/C powders as raw material. The effects of different materials ratio and auxiliary agents on the synthesis of Ti2SC were investigated. The phase composition and morphology of the products were analyzed by XRD and SEM, respectively. The reaction mechanism of Ti2SC synthesis was also studied. The results show that the majority products are Ti2SC and small amounts of TiC and Ti3S4 in the synthesized sample. Adding excess S in the raw materials can inhibit the synthesis of TiC phase and enhance the synthesis of Ti3S4;adding suitable Al can enhance the synthesis of Ti2SC and restrain the formation of TiC and Ti3S4. The adiabatic temperature of 2Ti-S-C system reaches 2 398 K. The reaction mechanism for synthesizing Ti2SC has been proposed, which implicates that in the Ti-S-C reaction system, Ti reacts with S to form Ti-S liquid firstly;then Ti reacts with C to form TiC;at last, liquid Ti-S reacts with TiC to form Ti2SC.
