CAJ | 학술논문

采用工业化生产技术制备纳米钨粉体,对样品进行不同温度热处理;采用SEM、XRD、EDS和全自动比表面和孔隙度分析仪对样品的形貌、物相、含量和比表面、孔结构进行表征.通过计算品格变化率判断热处理后样品的晶格变化,并测量其粒径和孔容大小来解释晶粒的长大机理和孔结构的变化.结果表明:经热处理纳米钨粉体的晶格由收缩变为膨胀,且随热处理温度升高,比表面积和孔径均减小,粒径增大.当热处理温度达1200℃时,晶粒长大迅速,其长大机理根据晶界迁移解释.
채용공업화생산기술제비납미오분체,대양품진행불동온도열처리;채용SEM、XRD、EDS화전자동비표면화공극도분석의대양품적형모、물상、함량화비표면、공결구진행표정.통과계산품격변화솔판단열처리후양품적정격변화,병측량기립경화공용대소래해석정립적장대궤리화공결구적변화.결과표명:경열처리납미오분체적정격유수축변위팽창,차수열처리온도승고,비표면적화공경균감소,립경증대.당열처리온도체1200℃시,정립장대신속,기장대궤리근거정계천이해석.
Nano-W powder was produced by industrialized production technology, and the heat treatment of samples was carded out at different temperature. The morphology, phase, content and special surface area, and pore structure of the samples were characterized using SEM, XRD, EDS and automated surface area and pore size analyzer respectively. The lattice changes of the samples after heated treatment were judged by calculating the change rate of lattice, and the growth mechanism of grain and the change of pore structure were explained by measuring its grain size and pore volume. The results indicate that the lattices of nano-W powder after heat treatment have changed into expansion from contraction. With temperature increasing, the specific surface area and pore size decreases, and particle size increases. The grain growth is very rapid at 1200 ℃, and its growth mechanism is explained according to grain boundary migration.