Interface of SiCf/Ti-matrix composites
Journal Title: Science Paper Online - Year 2007, Vol 2, Issue 5
Abstract
SiC fiber reinforced Ti-matrix composites are important materials for the application in aerospace. However, the interfacial reaction between fiber and matrix degenerates the mechanical properties of the composites. With the help of transmission electron microscopy, scanning electron microscopy and X-ray diffraction, the interfacial reaction products are identified. And the interfacial reaction is analyzed based on thermal dynamics and kinetics. It is shown that different reaction products appear and distribute in several layers during the interfacial reaction in different composites. The interfacial reaction is controlled by diffusion but the reaction rate is not the same in different composites system. It is confirmed that both interfacial coating and matrix alloying are very important for decreasing the interfacial reaction.
Authors and Affiliations
Yanqing Yang, Xianghong Lü, Zhijun Ma
ICP-AES法测定中药材宣木瓜及其<br /> 种植土壤中18种元素<br />
【目的】建立电感耦合等离子体原子发射光谱法(ICP-AES)测定中药材宣木瓜及其种植土壤中18种元素含量的方法。【方法】采用微波消解处理样品,并考察了不同元素间相互干扰,采用ICP-AES同时测定18种元素。【结果】对所测定元素的相对标准偏...
h-型自适应有限元法计算重力坝应力的<br /> 能量误差控制标准<br />
鉴于目前重力坝有限元计算仍没有相应应力取值标准,本文应用自适应有限元法,通过对L型板和重力坝进行多种情况下的线弹性自适应计算,提出了基于h-型自适应有限元法的全域能量误差限控制标准。算例表明,自适应计算不会因角缘应力集中而...
A heterogeneous wireless network selection model based<br /> on bidding mechanism<br />
Network selection issue in heterogeneous wireless network is a hot topic, it also is critical to next generation network. In this paper, we sum up a lot of metrics of heterogeneous wireless network selection, and design...
The change of absorption spectrum of colloidal Au particles in water-ethanol solution
Stable colloidal Au particles with mean diameter about 5nm in water solution are obtained by reduction of AuCl4- using NaBH4. The wavelength and strength of surface plasma resonance (SPR) absorption of colloidal Au part...
Disscussion on deductive preference and non-deductive preference <br /> in mathematical proof<br /> ——The answer for some questions<br />
Non-deductive preference may improve the understanding of the mathematical proof and the preference in it. Non-deductive preference is feasible in natural and social science owing to the highest abstraction and generaliz...