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There are four kinds of fracture ways of 7075/SiC composite under high-temperature compression, which are the evulsions of SiC from the matrix due to forming cavity near the interface and intensive phase , ductile fracture of the matrix due to the nucleation of cavity near the interface , the fracture near SiC particulate coacervate and brittle fracture of the SiC particulate.

喷射沉积7075/SiC复合材料高温压缩时的断裂方式主要有四种，即空洞在增强相与基体界面处形成而出现增强相从基体中拔出的现象、空洞在基体中形核长大而引起基体的延性断裂、颗粒团聚处的断裂和颗粒的脆性断裂。

However, in the temperature range of 1150-1300℃, the surface morphology of SiC coatings changes to rounded hillocks and the as-deposited coatings are very rough.

沉积温度和SiC涂层表面形貌的关系如下： 950℃时，沉积的SiC颗粒非常细小，为独立的球形堆积； 1000～1100℃时， CVD SiC涂层表面光滑、致密； 1150～1300℃沉积的SiC涂层呈现出球状或瘤状结构且表面粗糙。

Based on the important phenomenon, the syntheses of SiC nanomaterials from FeSi and NiSi flux were performed, and a great deal of high-quality SiC nanowhiskers were obtained.

基于这一事实，进行了以FeSi和NiSi为助溶剂SiC一维纳米材料生长的研究，得到大量高质量的SiC纳米晶须。

The polytype of SiC with Al was 6H, and the one of SiC with Al and N changed from 21R to 2H with the increasing of Al content.

固溶Al的SiC为6H型，而固溶Al和N的SiC其晶型则随铝含量的增加从21R逐渐过渡到2H。

In this study, SiC as a carrier, Pt reactive component, Prepared by impregnating a series of Pt/SiC catalyst and influence of temperature, space velocity, Pt loading and auxiliaries Pt/SiC catalyst for the activity.

本研究以碳化硅为载体，Pt为活性组分，通过浸渍法制备了一系列的Pt/SiC催化剂，并考察了焙烧温度、空速、Pt负载量以及助剂对Pt/SiC催化剂的活性的影响。

A special process named "silicification followed by carbonization" was adopted to solve the problems such as SiC grains forming on the SiO2 and poor cohesiveness between the SiC and substrate. Furthermore,this method is effective to prevent O atoms diffusing from SiO2 into SiC epilayer.

通过"先硅化再碳化"的工艺方法可以较好地解决SiO2/Si复合衬底上SiC成核困难以及粘附性差的问题，同时还可以有效抑制SiO2中的O原子向SiC生长膜扩散。

SiC/Al composites were prepared with pressureless infiltration method. Using pin on disk tribometer, the influence of volume fraction and particle size of SiC on dry friction and wear properties of the SiC/Al composites were investigated. The wear mechanism of the composites was studied with the analysis of the worn surface by SEM.

采用无压浸渗法制备不同碳化硅粒度和体积分数的SiC/Al复合材料，利用销－盘摩擦磨损试验机考察了碳化硅的粒度和体积分数等对SiC/Al复合材料干摩擦磨损性能的影响，采用扫描电子显微镜观察磨损表面形貌并分析其磨损机理。

The results show that a certain degree of increase of SiC content was helpful for nitrification of TiSi2, and SiC particles were nitrified during the SHS p.

结果表明：SiC在一定范围内增加有利于TiSi2的氮化，且含40%SiC和50％SiC的压坯在燃烧合成过程中发生了SiC的氮化反应。

The new-model double-interpenetrating SiC/390AI composites reinforced by hollow and porous foam ceramic were fabricated by the squeeze casting method, and the effect of the structures of struts of SiC foam reinforcement on the SiC/390AI composites was investigated.

以空心多孔SiC泡沫陶瓷为增强体，用挤压铸造法制备了新型复式连通双连续相SiC/390Al复合材料，研究了泡沫陶瓷骨架筋的结构对复合材料的影响，以及复合材料中的界面对力学性能的影响。

The results shows that the flow characteristics of SiC-AlN granulated powder is obviously promoted after spray drying and a suitable particles grade match. With the increasing of pressure, the density of green body increases by the style of ladder at the pressure range of 4080 MPa, 80160 MPa and 160220 MPa, the green body is uniform and densification without hard pelleted particles above 160 MPa. The pressureless sintering SiC-AlN multiphase ceramic possesses superior sintering properties and mechanical properties. It is due to the rampart formation of AlN to SiC grain growth and the reaction of SiC and AlN to form 2H solid solution. It results in the grain fining, crack expansion producing bypass and deflection, fracture section producing tearing-open and pulling-out effects, which cooperatively improves the strength and fracture toughness of the multiphase ceramics.

结果表明：喷雾造粒后，复合粉体的流动特性显著提高，粒度级配合理；随着压强增加，坯体密度在40~80、80~160和160~220 MPa范围内呈现阶梯式增长，160 MPa以上成形后素坯均匀致密，无硬球颗粒存在；无压烧结SiC-AlN复相陶瓷具有优越的烧结性能和力学性能，这是由于AlN对SiC晶粒形成生长势垒，并反应生成2H型固溶体，从而细化晶粒，导致裂纹扩展产生了绕道与偏转效应，呈现晶粒撕裂与拨出现象，协同改善了复相陶瓷的强度及断裂韧性。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了