非贵金属电解水催化剂改性研究进展

氢能作为理想的二次能源,具有能量密度高、清洁无污染等特点,在能源转型过程中将发挥极为重要的作用。电解水制氢被认为是获取氢能最有潜力的绿色工艺,而高效电催化剂是制约电解水制氢快速发展的关键。贵金属催化剂具有优良的电催化性能,但由于成本和储量问题严重限制其推广应用,因而开发低成本高活性的非贵金属催化剂逐渐成为研究热点。为提高非贵金属催化剂的电催化性能,需要对其进行一系列的改性优化工作。综述了近几年国内外非贵金属电解水催化剂的改性研究进展,详细介绍了几何构造（一维、二维、三维结构）和电子调控（组成优化、晶面调控、缺陷构造、杂原子掺杂等）两种非贵金属催化剂的改性方法,并对今后非贵金属电解水催化剂改性发展方向进行了展望。     

Microstructure Evolution and Tensile Properties of a Selectively Laser Melted CoNi-Base Superalloy

Metallurgical and Materials Transactions A - A high $$\gamma ^{\prime }$$ volume fraction CoNi-base superalloy with roughly equal amounts of cobalt and nickel was successfully processed through...     

碳质金矿中碳质物及其“劫金”机理研究进展

碳质金矿是重要的难处理金矿资源之一,碳质物“劫金”是金浸出率低下的主要原因。碳质物组分复杂,不同组分的碳质物的“劫金”能力和“劫金”行为存在差异,磨矿和浸出环节对碳质物的“劫金”能力也会产生影响,这些因素均能直接影响金的浸出率。通过系统总结碳质金矿中碳质物在组成特征、“劫金”机理及“劫金”能力的影响因素等方面的研究进展,对碳质物“劫金”机理现有研究工作的不足及未来研究方向进行了探讨,为碳质金矿碳质物劫金机理及预处理工艺的研究提供了重要参考。     

化学镀钴-磷基多元合金的研究现状

由于钴－磷基合金膜具有优异的磁性能和较高的耐蚀性，能有效的用于数字存储装置，已引起人们的极大关注。     

Multidisciplinary optimization of gas-quenching process

Distortion as a result of the quenching process is predominantly due to the thermal gradient and phase transformations within the component. Compared with traditional liquid quenching, the thermal boundary conditions during gas quenching are relatively simple to control. By adjusting the gas-quenching furnace pressure, the flow speed, or the spray nozzle configuration, the heat-transfer coefficients can be designed in terms of both the component geometry and the quenching time. The purpose of this research is to apply the optimization methodology to design the gas-quenching process. The design objective is to minimize the distortion caused by quenching. Constraints on the average surface hardness, and its distribution and residual stress are imposed. The heat-transfer coefficients are used as design variables. DEFORM-HT is used to predict material response during quenching. The response surface method is used to obtain the analytical models of the objective function and constraints in terms of the design variables. Once the response surfaces of the objective and constraints are obtained, they are used to search for the optimum heat-transfer coefficients. This process is then used instead of the finite-element analysis. A one-gear blank case study is used to demonstrate the optimization scheme.     

铣削刀片用纳米改性金属陶瓷的显微组织和力学性能

研究了铣削刀片用纳米改性金属陶瓷的显微组织与力学性能。SEM观察结果表明,铣削刀片用纳米改性金属陶瓷组织仍由陶瓷相和金属相组成,其中粗大的陶瓷相颗粒为芯/壳结构;Mo元素添加能有效细化金属陶瓷陶瓷基体组织。抗弯测试表明,随金属相含量增加,金属陶瓷的抗弯强度和断裂韧性增加,而硬度则降低;断口分析可知,沿晶断裂为其主要的断裂方式。