Characterization of Mo-SiO2 functionally graded materials
Characterization of Mo-SiO2 functionally graded materials
复制标题
Mo-SiO2功能梯度材料的表征
DOI：
10.1007/s11661-000-0074-6
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Eduardo Saiz
中科院分区：
文献类型：
--
作者：
H. Ishibashi;H. Tobimatsu;K. Hayashi;T. Matsumoto;A. Tomsia;Eduardo Saiz
采用注浆成型与沉淀法相结合的方法制备了Mo/SiO2功能梯度材料。最终的烧结样品具有钼含量梯度，最大值为20 - 25体积% Mo。在一个边缘处，FGM是良好的电导体（约占总长度的三分之一），而相对端主要由熔融SiO2组成。分析了电阻率、硬度、韧性和热膨胀沿着梯度的变化规律。在真空中烧结的功能梯度材料含有少量的钼氧化物（约20wt%）作为第三相。氧化物来源于起始Mo粉和预烧过程中的氧化。氧化物呈离散颗粒的形式，对测量的性能没有明显影响。Mo含量对FGM性能具有预期的影响; Mo的增加增加电阻率、热膨胀和韧性。
Mo/SiO2 functionally graded materials (FGMs) have been prepared by combined slip casting and sedimentation techniques. The final, sintered samples have a gradient in molybdenum content, with a maximum value of ∼20 to 25 vol pct Mo. At one edge, the FGM is a good electrical conductor (for approximately one-third of the total length), while the opposite end is composed mainly of fused SiO2. The variation of electrical resistivity, hardness, toughness, and thermal expansion along the gradient has been analyzed. The FGMs sintered in vacuum contained a small amount of Mo oxide (∼2 wt pct) as a third phase. The oxide originated from the starting Mo powders and oxidation during presintering. The oxide was in the form of discrete particles and did not appreciably affect the measured properties. The Mo content had the expected effect on the FGM properties; an increase in Mo increases resistivity, thermal expansion, and toughness.