(1. 陸軍裝甲兵學(xué)院裝備再制造技術(shù)國防科技重點(diǎn)實(shí)驗(yàn)室，北京 100072；
2. 河北京津冀再制造產(chǎn)業(yè)技術(shù)研究有限公司，河間 062450；
3. 北京睿曼科技有限公司，北京100043)
摘 要: 以石墨和Ti粉為原料，在Ti6Al4V基體表面感應(yīng)熔覆原位合成了TiC增強(qiáng)Ti基復(fù)合涂層，研究了預(yù)置反應(yīng)物粉末中C含量和熔覆工藝參數(shù)對(duì)復(fù)合涂層微觀組織演變、物相組成、增強(qiáng)體形態(tài)與分布、界面結(jié)合行為以及顯微硬度的影響規(guī)律。結(jié)果表明，復(fù)合涂層內(nèi)部原位自生TiC增強(qiáng)體分布均勻，與Ti基質(zhì)相結(jié)合緊密、界面潔凈，TiC增強(qiáng)體的最終形態(tài)與分布主要受涂層成分、凝固過程和自身晶體結(jié)構(gòu)的影響。隨著石墨含量升高，TiC增強(qiáng)體形態(tài)逐漸由短纖維狀演變?yōu)榈容S晶狀，尺寸和體積分?jǐn)?shù)以及涂層顯微硬度逐漸增大。隨著熱輸入量增加，TiC尺寸逐漸增大，界面過渡區(qū)寬度及基體熱影響也隨之增加。
關(guān)鍵字: 原位合成；碳化鈦；感應(yīng)熔覆；顯微組織；鈦基復(fù)合材料
（1. National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China;
2. Hebei Jingjinji Institute of Remanufacturing Industry & Technology Co., Ltd., Hejian 062450, China;
3. Beijing Ruiman Technologies Co., Ltd., Beijing 100043, China）
Abstract:TiC/Ti composite coating was in-situ synthesized on Ti6Al4V substrate using the powder mixture of Ti and graphite by induction cladding method. The effects of chemical composition of raw materials and processing parameter on the microstructure, phase structure, morphology and distribution of the reinforcements, interface bonding behavior and microhardness of the composite coating were studied. The results indicate that fine TiC reinforcements, with a clean interface and tight bond with the matrix, are in-situ formed and uniformly dispersed in the coating. The morphology and distribution of TiC reinforcements in coating are mainly influenced by the composition, solidification process and crystal structure of TiC. With the increase of graphite content, the morphology of the in-situ TiC gradually evolves from short fiber to equiaxed crystal, and its size and volume fraction and the coating hardness increase. With the increase of heat input, the size of TiC increases, and the width of the interface transition region and the heat effect on the substrate also increase.
Key words: in-situ synthesis; TiC; induction cladding; microstructure; Ti matrix composite
