The composite material , which is used to make muller plow of sand mill , is prepared by the method of cast - infiltration and the technology parameters for making composite material is optimized . then the effects of the matrix component on composite layer also are disccused 通过试验对利用铸渗法在铸件表面获得一定厚度复合材料层的形成机理进行了理论分析，优选了利用铸渗法在铸件表面制备复合材料的工艺参数（浇注温度、合金膏块的厚度、浇注位置等） 。
Microstructure of the composite layer was analyzed with help of optical microscope , scanning electronic microscope ( sem ) , electronic probe microanalysis ( epma ) and x - ray diffraction ( xrd ) . the compacting of the billet and the forming mechanism of the carbide reinforcement were studied based on thermodynamics and kinetics of reaction , sintering theory and the result of dta . at the same time , the wear - resistance of the composite layer was studied under condition of dry sliding friction 利用光学显微镜、扫描电子显微镜、电子探针以及x -射线衍射仪，分析了表面复合层的基体组织结构；运用反应热力学、动力学、粉末烧结理论和燃烧合成理论，结合差热分析结果，探讨了表面复合层压坯的烧结致密化原理和碳化物增强相的形成机理；利用坯块在真空烧结炉不同温度下的烧结出来的显微组织分析，模拟出坯块的烧结过程中的化学反应过程。
Based on the analysis of advanced composite structure design and its optimal methods , the author in this thesis sophisticatedly discusses the applied optimal design techniques of composite layered panel tail - structure of a developing aircraft in the phase of theoretical layout design by using ansys system 本文在分析复合材料结构设计技术及优化设计方法的基础上，应用ansys软件环境，系统深入地研究探讨了某型在研飞机平尾复合材料结构打样设计阶段的实用优化设计技术。
By the methods of epn ( electronic probing needle ) 、 sem and xed , the formation mechanisms of the wear - resistant composite layer are studied , the results indicated that , molten iron has infiltrated into the alloying layer under capillary action . this caused ht powder , whose fusion point is low relatively , to be surperheated and formed a surface composite layer 利用电子显微镜及x射线衍射等试验方法，研究了复合层形成机理，研究表明，复合层是在毛细力作用下，铁液被吸入合金层中，致使低熔点ht粉过热熔化而形成的，并与母材是冶金结合。
The results show that , composite could be fabricated on the complicated surface by means of sodium silicate sand mold combination with vacuum infiltration process . when the substrate was 10 mm , composite layers reached 3 mm to 5 mm in thickness with high strength interface and less casting defect . microstructures of grey cast iron and low chromium cast iron matrix composites with various volume fraction has been analyzed 结果表明：用水玻璃砂型(芯)加负压铸渗的工艺能够实现复杂表面(曲面)颗粒增强复合材料的制备，浇注方式简单可靠，基材厚度在10mm时，复合层厚度能达到3 5mm ，且复合层铸造缺陷少，复合效果好，界面致密而且结合强度高。
The particles distributed hi the matrix of grey cast iron , but some contact each other . the composite layer extend gradually into the substrate . when volume fraction of wc is 36 wt % and 27 wt % , the matrix of the composite is high chromium cast iron , consist of white carbide bars and the austenite . wc particles distributed uniformly , retaining approximately quondam granular form in the composite layer which has an evident interface area with the substrate , with good bonding strength 对不同碳化钨体积分数的灰铁和低铬铸铁基复合材料的微观组织结构分析表明：碳化钨体积分数为52时，复合层内基体为灰口铸铁组织，颗粒直接分布在灰铁基体上，部分碳化钨颗粒有相互接触的现象，基材与复合层之间没有明显的过渡；碳化钨体积分数为36 、 27时，复合层内基体为高铬铸铁，由面块状的奥氏体和白条状碳化物组成，碳化钨颗粒表面固溶于基体组织中，粒形基本保持完整，分布均匀，与基体构成冶金结合，基材与复合层之间存在一个明显的平缓过渡区。
