(1. 南昌航空大學(xué) 材料科學(xué)與工程學(xué)院，南昌 330063；
2. 南昌航空大學(xué) 土木建筑學(xué)院，南昌 330063)
摘 要: 通過(guò)對(duì)金剛石表面化學(xué)鍍Ni對(duì)金剛石顆粒鍍覆金屬層進(jìn)行表面改性。采用X射線衍射儀(XRD)對(duì)Fe基非晶合金進(jìn)行物相分析，利用差示掃描量熱儀(DSC)測(cè)試Fe基非晶粉的特征溫度點(diǎn)，采用掃描電子顯微鏡(SEM)觀察界面結(jié)合情況和界面產(chǎn)物微觀形貌，用能譜儀(EDS)進(jìn)行物質(zhì)元素分析，采用激光熱導(dǎo)儀(LFA 447)對(duì)復(fù)合材料進(jìn)行熱擴(kuò)散系數(shù)測(cè)試。結(jié)果表明：充分利用Fe基非晶合金相轉(zhuǎn)變過(guò)程中的原位自放熱，提升Al液的流動(dòng)性，增強(qiáng)了金剛石/Al復(fù)合材料的界面結(jié)合能力。Fe基非晶合金相轉(zhuǎn)變后多組元晶體的形核和長(zhǎng)大，提高了復(fù)合材料界面熱阻，降低了金剛石/Al復(fù)合材料的峰值導(dǎo)熱性能。Fe基非晶的引入提高了金剛石/Al復(fù)合材料的導(dǎo)熱穩(wěn)定性，在測(cè)試溫度范圍內(nèi)，導(dǎo)熱穩(wěn)定性提高10.3%。引入過(guò)量的Fe基非晶合金或過(guò)長(zhǎng)的制備時(shí)間會(huì)引起金剛石顆粒發(fā)生碳化。
關(guān)鍵字: Fe基非晶合金；金屬基復(fù)合材料；顯微結(jié)構(gòu)；熱導(dǎo)率
（1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China;
2. School of Civil Architecture, Nanchang Hangkong University, Nanchang 330063, China）
Abstract:The surface of diamond was modified by electroless plating Ni on the surface of diamond particles. X-ray diffraction (XRD) was used to analyze the phase of Fe-based amorphous alloy. The characteristic temperature point of Fe-based amorphous powder was measured by DSC. Scanning electron microscoper (SEM) was used to observe the interface bonding and the micro morphology of the interface products. The material elements were analyzed by EDS. The thermal diffusivity of the composite was measured by laser thermal conductivity analyzer (LFA 447). The results show that, the in-situ self-exothermic heat during the crystal transformation of Fe based amorphous alloy is fully utilized to improve the fluidity of Al liquid and enhance the interface bonding of diamond/Al composite. After crystallization, the nucleation and growth of multi-component crystals of Fe based amorphous alloy increase the interfacial thermal resistance of the composite and reduce the thermal conductivity of diamond/Al composite. The introduction of Fe-based amorphous alloy improves the thermal stability of diamond/Al composite, which increases by 10.3% in the test temperature range. Too much Fe-based amorphous alloy or too long preparation time will lead to carbonization of diamond particles.
Key words: Fe based amorphous alloy; metallic matrix composite; microstructure; thermal conductivity
