本文選題：水熱共還原　切入點(diǎn)：真空燒結(jié)　出處：《粉末冶金材料科學(xué)與工程》2016年01期 　論文類型：期刊論文

【摘要】：以水熱共還原法制備納米W-30%Cu復(fù)合粉末,通過(guò)真空燒結(jié)和包套熱擠壓制備超細(xì)晶W-Cu復(fù)合材料,并進(jìn)行后續(xù)熱處理。采用X射線衍射、高分辨率透射電鏡、掃描電鏡等觀察和分析W-30%Cu復(fù)合粉體和合金的成分及組織形貌,研究熱擠壓及后續(xù)退火處理對(duì)材料致密度、電導(dǎo)率和硬度等性能的影響。結(jié)果表明:水熱產(chǎn)物為納米級(jí)(10~15 nm)規(guī)則的類球形結(jié)構(gòu),經(jīng)煅燒及共還原后得到的W-30%Cu復(fù)合粉末粒度細(xì)小,呈特殊的W包覆Cu結(jié)構(gòu),顆粒分布均勻;復(fù)合粉末在1050℃真空燒結(jié)后相對(duì)密度只有91.5%,經(jīng)熱擠壓后致密度提高到97.07%,布氏硬度達(dá)到223,組織細(xì)密,W相和Cu相分布均勻,鎢顆粒細(xì)小(1~3μm),形成典型的鎢骨架和銅網(wǎng)絡(luò)結(jié)構(gòu)。經(jīng)過(guò)后續(xù)的退火處理,鎢銅分布更均勻,鎢粒徑進(jìn)一步減小,材料的致密度和電導(dǎo)率都更高,分別為98.82%和43.31%IACS,形成良好的綜合性能指標(biāo)匹配。
[Abstract]:Nanocrystalline W-30 and Cu composite powders were prepared by hydrothermal co-reduction method. Ultrafine grain W-Cu composites were prepared by vacuum sintering and hot extrusion, followed by heat treatment. X-ray diffraction and high resolution transmission electron microscopy were used. The composition and microstructure of W-30Cu composite powder and alloy were observed and analyzed by scanning electron microscope (SEM). The density of W-30Cu composite powder and alloy was studied by hot extrusion and subsequent annealing. The results show that the hydrothermal product is a regular spherical structure of nanometer scale 1015 nm. The W-30Cu composite powder obtained by calcination and co-reduction has a fine particle size and a special W coated Cu structure, and the particle distribution is uniform. The relative density of the composite powder sintered in vacuum at 1050 鈩，

本文編號(hào)：1564064