粉末冶金低合金钢的制备和性能研究进展

从粉末制备、成形工艺、烧结工艺和组织控制等方面,系统的介绍了国内外粉末冶金低合金钢的制备技术,并对其研究方向和应用前景进行了展望。     

机械合金化CuRECr合金的显微组织结构及性能分析

利用机械合金化和真空烧结技术制备CuRECr25和CuRECr50合金，讨论了机械合金化不同球磨时间、球料比等工艺参数对合金显微组织结构、物理机械性能，含氧量、含氮量等的影响，并且与CuCr25、CuCr50合金进行了物理机械性能比较。研究结果表明：CuRECr合金组织均匀、细微，具有强度、硬度高等特点，为改进CuCr系电真空接触材料开辟了新途径。     

冶金烧结强化盘式钻头齿圈的试验研究

在分析盘式钻头齿圈失效机理的基础上,提出了齿圈表面堆焊耐磨合金强化和镶嵌硬质合金齿圈强化两种方法。通过试验研究和对比分析,确定了采用冶金混合烧结固齿法镶嵌硬质合金齿圈强化盘式钻头。进一步的试验研究表明:采用冶金混合烧结固齿法镶嵌硬质合金齿圈来强化盘式钻头齿圈,其结合情况非常好;硬质合金齿圈的硬度、耐磨料磨损的能力和耐冲击磨料磨损的能力在烧结后都有进一步的提高,说明采用冶金混合烧结固齿法镶嵌硬质合金齿圈来强化盘式钻头齿圈是可行的。     

提高干压各向异性SrM磁体磁性能的方法

以Y30H-1的SrM预烧料为原料,通过对二次添加剂、二次球磨及烧结曲线的调整,做出了Br≥380mT,Hcb≥240kA穖-1,Hcj≥250kA穖-1,(BH)max≥27.0kJm-3的干压各向异性锶铁氧体产品。     

WC含量对弥散强化铜Cu/WC组织与性能影响的研究

对以WC粒子为第二相的弥散强化铜材料的组织与性能进行了研究。在同样条件下，用机械混料方法制备了不同WC含量的Cu/WC复合材料，分别测定了其密度，电阻率和硬度，结果表明：WC粒子是一种较为理想的弥散相，并且WC体积含量为1.2%时，细小的球形状第二相粒子均匀分布，弥散效果好，材料密度，硬度较高，而电阻率较小，综合性能较好。     

改造本钢265m2烧结机倒料线提高作业率

针对本钢 2× 2 65m2 烧结机成品矿输送流程设计不合理而导致的烧结机频繁停机 ,通过采取合理的改进措施 ,实现了不停机倒料线 ,有效地提高了烧结机作业率和烧结矿产量 ,同时 ,烧结矿质量也有所改善     

三(明)钢烧结厂电除尘灰的气力输送

三钢烧结厂130m^2烧结机电除尘输灰首次采用了气力输送系统。该系统由气源、输送、管路、灰库及控制五部分组成，本文介绍了系统的工作原理及运行调试情况。系统投产后，运行平稳，达到了设计要求。     

近年太钢烧结技术发展回顾与展望

近年来太钢由于烧结技术进步，烧结矿质量不断改善，固体燃耗降低，促进了高炉炉料结构的优化。为高炉技术经济指标提高奠定了基础。     

New Ferro Powder for Selective Laser Sintering of Dense Parts

The paper describes a new powder composition specially developed for selective laser sintering (SLS). The aim is to obtain a ferro powder that can be sintered without need for a (sacrificial) polymer binder and that results in quasi dense parts that do not need any post-processing like furnace sintering, infiltration or HIP. The powder is a mixture of different types of particles (Fe, Cu, Ni and Fe₃P). The composition and mixture ratio are justified by using phase diagrams. The powder has been tested using an own developed Nd: YAG SLS machine. The influence of process parameters (laser power, scan velocity, scan spacing and scan strategy) and the microstructural characteristics have been investigated. Attention is devoted to the binding mechanism (liquid phase sintering, through melting) and to the quality of resulting parts (density, balling effect,…).     

Mechanics of sintering materials with bimodal pore distribution. III. Kinetics of sintering combined with various forms of loading and adhesion conditions

A study has been made on the effects of loading scheme and conditions restricting macroscopic strain on the work-hardening kinetics and strain accumulation in the solid state in sintering materials with bimodal pore size distributions. Active loading intensifies the reduction in the small pores. The greatest effect comes from combining sintering with hydrostatic compression. At the same time, kinematic constraints (partial or complete adhesion in surfaces) substantially retards the shrinkage of large pores, which means that the porous structure can be controlled. __________ Translated from Poroshkovaya Metallurgiya, Nos. 5–6(449), pp. 10–15, May–June, 2006.