復(fù)合涂層的組織與性能
( 1. 河海大學(xué) 材料科學(xué)與工程系， 南京 210098;
2. 東南大學(xué) 材料科學(xué)與工程系， 南京 210096)
摘 要: 利用等離子熔覆技術(shù)， 在廉價(jià)的碳鋼表面原位合成了TiC/Ni基復(fù)合材料涂層。 借助金相顯微鏡、掃描電鏡、 X射線衍射儀、 顯微硬度計(jì)對(duì)復(fù)合涂層的組織、結(jié)構(gòu)、 性能進(jìn)行了測(cè)試。 結(jié)果表明： 當(dāng)Ti+C含量為10%~20%時(shí)， 熔覆層成形良好, 與基體呈冶金結(jié)合， 無裂紋、 氣孔等缺陷；熔覆層的組織為γ-Ni枝晶、 M23C6、 CrB及原位合成的TiC陶瓷顆粒， TiC大部分呈球狀， 少量呈方塊狀， 尺寸為1~2μm， 靠近熔覆層底部的TiC顆粒比近表層的為小， 均彌散分布于熔覆層中； 熔覆層顯微硬度達(dá)HV0.11000, 是碳鋼基體的4倍。
關(guān)鍵字: 等離子熔覆； 原位合成； 組織； 復(fù)合涂層； TiC顆粒
TiC particle reinforced composite coating by plasma cladding
（ 1. Department of Materials Science and Engineering,
Hohai University, Nanjing 210098, China;
2. Department of Materials Science and Engineering,
Southeast University, Nanjing 210096, China）
Abstract: Plasma cladding technology was used for in-situ synthesis of TiC/Ni composite coating. The microstructure and properties of the coating were investigated by optical microscope, scanning electron microscope, X-Ray diffractometer, transmission electron microscope and microhardness tester. The results show that excellent bonding between the coating and the carbon steel substrate is ensured by the strong metallurgical interface, and the coating is uniform, continuous and almost defect-free when ［Ti+C］ is varied from 10% to 20% after ball milling. The microstructure of the plasma-cladded coating is mainly composed of γ-Ni dendrite, M23C6 , CrB and TiC ceramic particle which is synthesized in-situ. Most of TiC particles are spherical and a small fraction are blocky. TiC particle size is 1-2μm. The particles at the bottom are smaller than those near the top of the coating， and dispersivly distributed in the cladded coating. The maximum hardness of the coating is HV0.1 1000, and 4 times of the microhardness of the steel substrate
Key words: plasma cladding; in-situ synthesis; microstructure; composite coating; TiC particle
