(1. 中南大學(xué) 材料科學(xué)與工程系, 長沙 410083;
2. 福州大學(xué) 機(jī)械系, 福州350002)
摘 要: 采用超細(xì)金剛石(UFD)粉末作為復(fù)合粒子，制備了Ni-P-UFD復(fù)合鍍層，研究了復(fù)合鍍層晶化過程的組織結(jié)構(gòu)轉(zhuǎn)變，并通過差熱分析對(duì)比研究了Ni-P鍍層與Ni-P-UFD復(fù)合鍍層的晶化溫度及晶化激活能。結(jié)果表明，非晶態(tài)Ni-P-UFD復(fù)合鍍層熱處理時(shí)發(fā)生晶化，晶化后生成的穩(wěn)定相為Ni3P和Ni，晶化過程中生成亞穩(wěn)相Ni5P2，亞穩(wěn)相最終會(huì)轉(zhuǎn)變成穩(wěn)定相。在相同的加熱速率下，Ni-P-UFD復(fù)合鍍層晶化的起始溫度均低于Ni-P鍍層，但峰值溫度與Ni-P鍍層相當(dāng)；Ni-P-UFD復(fù)合鍍層的晶化激活能高于Ni-P鍍層， 說明UFD加入后非晶鍍層的穩(wěn)定性增加，晶化較難進(jìn)行。
關(guān)鍵字: 復(fù)合鍍層； 晶化； 組織； 激活能
diamond(UFD) composite coating
（1. Department of Metarials Science and Engineering,
Central South University， Changsha 410083, P.R.China;
2. Department of Mechanics, Fuzhou University，
Fuzhou 350002, P.R.China）
Abstract:Electroless Ni-P composite coating was deposited using Ultrafine Diamond(UFD). The effects of UFD on crystallization temperature and the activation energy of crystallization of the coating were investigated.The results show that the amorphous Ni-P-UFD composite coating crystallizes during heat treatment， the stable phase resulted from crystallization are Ni3P and Ni，and a metastable phase， Ni5P2，may appear during crystallization， while it transforms to stable phase by heat treatment. Under the same heating rate， the crystallization temperature of Ni-P-UFD composite coating is lower than that of Ni-P coating， while the peak temperature of the two electroless coating are well-matched. The crystallizationactivation energy of Ni-P-UFD is higher than that of Ni-P coating， which means the composite coating is stabler than Ni-P coating and the Ni-P-UFD coating is more difficult to crystallize than Ni-P.
Key words: composite coating； crystallization； microstructure； activation energy
