真空铸造高强度C/Mg复合材料

本文介绍用真空铸造法制造抗拉强度超过1000MPa的高强度C/Mg复合材料。将T300纤维经C-Si-O梯度涂层处理后单向排布于型腔内,在真空下注入ZM-5合金液,凝固后即得C/Mg复合材料零件或试样。试样的抗拉强度在纤维体积分数为0.35时达1050MPa。本文讨论C-Si-O梯度涂层对获得高强度复合材料的作用。     

T8钢－聚有机硅氧烷仿生减粘降阻复合涂层的特性

研究了Ｔ８钢－聚有机硅氧烷仿生减粘降阻复合涂层的表面润湿性、磨料磨损特性及对土壤的减粘降阻性能与金属材料相比，仿生复合涂层的表面憎水性显著提高，水在其表面上的接触角达９２°；与４５钢相比，其磨料磨损的体积相对耐磨系数为６３％，降阻率达１５．２２％～２２．２７％     

（2m，2，m）非线性等重码不是最佳检错码

本文证明了当ｍ＞４时（２ｍ，２，ｍ）非线性等重码不是最佳检错码。     

超高分子量聚乙烯的辐照效应

通过密度测定和ＤＳＣ热分析，观测了超高分子量聚乙烯的辐射效应。实验结果表明：在吸收剂量０—１．１３ＭＧｙ范围内，密度随吸收剂量的增加而增大，熔化热和熔点也有所增加，特别是在低剂量范围内增加十分明显。以上结果都说明，超高分子量聚乙烯在辐照过程中，结晶在完善或有新的结晶形成     

Improving Wear Resistance of the Ni-base Thermal Spray-Welding Coating Using Rare Earths

ＩｍｐｒｏｖｉｎｇＷｅａｒＲｅｓｉｓｔａｎｃｅｏｆｔｈｅＮｉｂａｓｅＴｈｅｒｍａｌＳｐｒａｙＷｅｌｄｉｎｇＣｏａｔｉｎｇＵｓｉｎｇＲａｒｅＥａｒｔｈｓＺｈａｉＧｕａｎｇｊｉｅ（翟光杰）（ＩｎｓｔｉｔｕｔｅｏｆＰｈｙｓｉｃｓ，ＡｃａｄｅｍｉｃａＳｉ...     

埋地管道涂层检测技术现状

文章对各种埋地管道涂层检测技术进行了综述,并指出了各种技术的优缺点及应用前景.     

SiC（w）／TZP＋mullite陶瓷复合材料界面和组成设计与力学性能

本文从理论上分析了ＳｉＣ（ｗ）ＴＺＰ＋ｍｕｌｌｉｔｅ（ｐ）复合材料界面残余热应力及其在基质内的分布规律。提出在ＳｉＣ（ｗ）表面涂复Ａｌ２Ｏ３和在ＰＺＴ中加入ｍｕｌｌｉｔｅ（ｐ）联合作用来降低晶须／基质界面残余热应力的界面设计方案，导出ＳｉＣ（ｗ）和ｍｕｌｌｉｔｅ（ｐ）协同补强ＰＺＴ的匹配条件。制备了ＳｉＣ（ｗ）／ＴＺＰ＋ｍｕｌｌｉｔｅ（ｐ）复合材料并了ＳｉＣ（ｗ）表面涂层Ａｌ２Ｏ３厚度和ＳｉＣ（ｗ     

Suspension force and mechanism of debris flows

The paper discusses the postulated suspension force, by which it is possible to explain some enigmatic phenomena observed in different types of mass movements. This force is generated in thick suspensions as a result of friction between sinking solid particles and static water. The suspension force is related to the seepage force but they have opposite directions. Both forces form flow networks. Having explained the suspension force, the paper describes how this influences the movement of material, particularly in debris flows. Enigmatic features and the mechanism of debris flows and lahars are explained by virtue of the suspension force. Electronic Publication     

水溶性丙烯酸涂料的环氧树脂改性

本实验论述了水溶性丙烯酸钢铁底漆涂料制备、性能以及用环氧树脂对其进行改性。原水溶性丙烯酸钢铁底漆涂料在进行耐盐雾测定试验时仅为 72h ,未通过国家规定标准。本实验的目的在于 ,以丙烯酸树脂为主要成膜物质 ,加入其他的辅助成膜物质 ,如环氧树脂来改善其抗盐雾、抗腐蚀、耐候等性能。结果表明 ,一定温度下在水溶性丙烯酸钢铁底漆涂料中加入 1/ 7的环氧树脂后 ,经测定其耐盐雾性可达 10 6h ,达到了国家的规定标准     

Intramolecular crosslinking of poly(vinyl alcohol)

Poly(vinyl alcohol) is crosslinked in dilute solution (c=0.1 wt%) with glutaraldehyde. The reaction product is characterized by viscometry and gel permeation chromatography (g.p.c.). The intrinsic viscosity decreases with increasing degree of crosslinking and does not depend on temperature. G.p.c. reveals that the reaction product is not homogeneous, but consists of a mixture of particles with different sizes, possibly both intra- and intermolecularly crosslinked molecules. The intramolecularly crosslinked molecules are smaller in size than the initial polymer molecules and their size depends on the degree of crosslinking. They possess a narrow particle size distribution even if the initial polymer sample had a broad molecular weight distribution.