稀有金属材料与工程
稀有金屬材料與工程
희유금속재료여공정
RARE METAL MATERIALS AND ENGINEERNG
2009年
z2期
172-174
,共3页
氧化铝%长柱状晶粒%纳米铝粉%生长机制
氧化鋁%長柱狀晶粒%納米鋁粉%生長機製
양화려%장주상정립%납미려분%생장궤제
alumina%elongated grains%aluminum nanopowder%growth mechanism
通过改变氧化铝粉体中纳米铝粉含量,研究了纳米铝粉对烧结氧化铝晶粒形态的影响.当铝粉质量分数为0.01%和0.1%时,氧化铝的晶粒分布具有双峰结构,部分晶粒为长柱状和板状晶粒,而当铝粉质量分数为0.5%时,整个氧化铝晶粒都呈现均匀、等轴结构,其与氧化镁的作用相类似.
通過改變氧化鋁粉體中納米鋁粉含量,研究瞭納米鋁粉對燒結氧化鋁晶粒形態的影響.噹鋁粉質量分數為0.01%和0.1%時,氧化鋁的晶粒分佈具有雙峰結構,部分晶粒為長柱狀和闆狀晶粒,而噹鋁粉質量分數為0.5%時,整箇氧化鋁晶粒都呈現均勻、等軸結構,其與氧化鎂的作用相類似.
통과개변양화려분체중납미려분함량,연구료납미려분대소결양화려정립형태적영향.당려분질량분수위0.01%화0.1%시,양화려적정립분포구유쌍봉결구,부분정립위장주상화판상정립,이당려분질량분수위0.5%시,정개양화려정립도정현균균、등축결구,기여양화미적작용상유사.
The microstructural evolution during sintering of Al_2O_3 was investigated to determine the role of Al nanoparticles. Compared with specimens without Al, a few platelike Al_2O_3 grains were observed with the addition of 0.01% and 0.1% (mass fraction) Al nanoparticles. When Al content was increased to 0.5%, a fine, equiaxed and homogeneous grained microstructure was obtained. This effect of Al on the microstructure of the sintered Al_2O_3 is similar to that of MgO.
