Modelling of metal-binder migration during liquid-phase sintering of graded cemented carbides

Sintering of cemented carbides with graded metal binder content is modelled in this article. Production of graded cemented carbides by traditional liquid-phase sintering is hampered by high rate of liquid-binder migration with inevitable subsequent homogenisation of binder content in specimens. The driving forces of the migration are analysed. It is shown that the migration is governed not only by capillary forces but also by additional stresses that arise due to surface tension at solid–liquid interfaces. As a result, the migration takes place even in pore-free graded specimens. A numerical approach for the prediction of binder flow with coupled deformation of the refractory skeleton during liquid-phase sintering is put forward. Calculations predict that complete densification of specimens with retention of graded-binder distribution can be achieved by sintering with long solid-state sintering stage ended by comparatively short high temperature liquid-phase stage.     

RST-120推杆式烧结炉

介绍了RST-120推杆式烧结炉的技术性能、组成、动作程序与控制。本烧结炉适用于年产量在300t左右的铁基粉末冶金制品厂。     

基于神经网络的烧结矿化学成分自适应预报系统的开发

将多层前向人工神经网络应用于烧结矿化学成分预报，改进后的BP算法可以实现网络结构的自组织。应用该技术开发的烧结矿化学成分自适应预报系统能够快速，准确地预报烧结矿的化学成分，可用于在线操作指导或作为自动控制的依据。     

太钢烧结厂多管除尘器的改造及效果

太钢烧结厂经过多年的实践，对多管除尘器进行了改造，提高了除尘效率和主风机转子使用寿命，取得了良好的经济效益和社会效益。     

我国烧结能耗现状和节能对策

分析了我国烧结能耗的现状及能耗高的原因；论述了我国烧结节能的意义；提出了烧结节能的方向和技术措施。     

马钢一铁总厂混匀料场的生产实践

介绍了烧结混匀料场的生产实际以及烧结、炼铁使用效果,同时提出了下一步的改进建议.     

Processing, microstructure, properties and wear behavior of in situ synthesized TiB2 and TiC thick films on steel substrates

TiB₂ and TiC reinforced Fe matrix thick films (2 mm thickness) were produced through the synthesis reaction from Ti, C and FeB powders with varying porosity on the steel substrates. Powder technology was used as a processing method. The films and the substrates were sintered in a single step. TiB₂, TiC and Fe were detected in the films by X-ray diffraction analysis. The fact that no other reaction product was detected revealed the thermal stability of TiB₂ and TiC. The formation of secondary reaction products was inhibited during the reactive sintering. The films showed maximum strength of 163-466 MPa when sintered separately at 1350 °C. The strength of the films varied with their porosity. The films showed considerable bonding strength with the steel substrates. The delamination of the films from the steel substrates was observed at stress values from 454-781 MPa. The microstructure, fracture and delaminated surface morphologies were studied. The wear resistance against hardened high speed steel was studied in reciprocating sliding tests. The wear mechanisms were discussed by means of microscopical observation on the worn surfaces.     

烧结机台车起拱原因分析及消除台车起拱的途径

分析了烧结机台车起拱的主要原因（１）星轮齿在推动台车运动过程中由于加减速运动产生的惯性力施加给星轮齿的附加推力；（２）由摆架重心偏移量产生的力矩；（３）尾部配重；（４）尾部星轮上四辆台车产生的总力矩。提出了消除台车起拱的新途径和解决方法。     

真空熔烧涂层与母材的界面研究

采用法向拉伸法测定了真空熔烧涂层与母材的界面结合强度 ,并用电子探针分析了合金元素沿层深分布情况。结果表明 ,真空熔烧法制得的涂层与母材间形成了牢固的冶金结合 ,界面结合强度可达 3 60～40 0MPa ,提高了材料的抗热疲劳性能。合金元素在界面两侧的扩散是影响材料显微组织、显微硬度及界面结合强度的关键     

烧结燃料二次分加优化试验研究

为进一步探明燃料种类及其搭配，燃料粒度等对燃料二次分加效果的影响，就二次分加时，无烟煤与焦粉的搭配顺序，焦粉粒度对钒钛磁铁精矿烧结指标的影响进行了研究。找出了适宜的燃料种类（焦粉）及其适应的粒度范围。为燃料二次分加工艺优化工业性试验提供了依据。