Investigation of Microstructure and Chemical Stability in Composites of NiAl Reinforced by Alumina-Silica Fibers

被引：0

作者：

Gottstein, Günter ^{[1
]}

Hu, Weiping ^{[1
]}

机构：

[1] Institut für Metallkunde und Metallphysik, RWTH, Aachen, Germany

来源：

International Journal of Materials Research | 2001年 / 92卷 / 10期

关键词：

Alumina-silica fibers - Complex thermodynamics - Composite specimens - Hot pressing temperature - In-vacuum - Interface structures - Ni diffusion - NiAl matrix - Sumitomo - Thermodynamic process;

D O I：

10.3139/ijmr-2001-0213

中图分类号：

学科分类号：

摘要：

Interface structure and chemical stability in composites of NiAl reinforced with alumina silica fibers (Sumitomo) were investigated by means of TEM, XEDS, EELS and electron diffraction. The composite specimens were fabricated by diffusion bonding in vacuum at 1300 ~ 1450 °C/ 5 ~ 15MPa/2h. The experimental results showed no Ni diffusion from the NiAl matrix into the fiber to occur during diffusion bonding. However, the fiber underwent complex thermodynamic processes depending on hot-pressing temperatures. They involved intrinsic chemical reactions between the fiber components to produce mullite and reduce silica, as well as extrinsic reactions between free oxygen and NiAl at the interface to generate α-Al2O3. The experimental results are discussed. © 2001 Carl Hanser Verlag, München.

引用

页码：1170 / 1174