航空航天钛合金用中间合金——钒铝65合金

中间合金是生产航空航天用钛合金和高温合金的关键原材料之一,然而中间合金的生产在国内航空航天材料界却没有引起足够的重视。重点介绍了目前在国际航空航天工业中应用最广泛的钒铝65中间合金,包括其制备工艺和质量控制等。与传统的钒铝55合金相比,钒铝65合金具有渣-金属分离效果好、有害杂质含量低、可见氧化膜与氮化膜少及成分均匀性好等优点,将是我国钒铝中间合金的发展方向。     

快速凝固TiAl化合物的研究进展

TiAl合金是一种很有希望的航空、航天及汽车用高温结构材料,但是其较低的室温塑性限制了它的应用.快速凝固技术有望使其性能得到改善.综述了近年来快速凝固TiAl合金的研究进展,包括快速凝固工艺、合金的发展以及合金的组织演变及其特征、力学性能及添加合金化元素的作用,亚稳相的产生及稳定性以及快速凝固薄带或粉末的固结等.     

球磨时间对粉末冶金制备Ti35Nb2.5Sn/10HA生物复合材料微观组织的影响(英文)

采用高能机械球磨和脉冲电流活化烧结方法制备了一种新型的β-钛合金基体的Ti35Nb2.5Sn/10HA生物复合材料。研究了机械球磨不同时间的Ti35Nb2.5Sn10HA粉体以及烧结样品的微观组织。结果表明:经机械球磨8h后,粉体中的α-钛开始向β-钛转化。当球磨时间达到12h时,球磨粉体中的α-钛相完全转化为β-钛相,而且得到超细尺寸的复合粉体。用球磨12h的粉末烧结制备的复合材料具有超细晶粒结构,烧结得到的复合材料的硬度和相对密度都随着球磨时间的延长而增加。     

建筑防水工程材料的检测方法浅析

由于市场经济调节和防水材料生产企业自身管理等原因,防水材料的质量问题也日益突出,检测作为控制防水材料质量和商品房质量的环节也越发显得重要。本文就建筑工程中常用的各类防水材料的检测方法和质量控制措施进行了分析。     

甲醇行业“十三五”发展规划研究(续完)

对甲醇行业重点领域煤制甲醇、天然气制甲醇、焦炉气制甲醇、氨醇联产和甲醇下游产业进行了研究,根据研究结果提出了若干政策建议。     

Microstructures and properties of titanium alloys Ti-Mo for dental use

The microstructures and properties of a series of binary Ti-Mo alloys with molybdenum contents ranging from 5% to 20%（mass fraction） were investigated. The experimental results indicate that the crystal structure and morphology of the cast alloys are sensitive to their molybdenum contents. When the Mo content is 5%, the equiaxed a crystal grain is observed. When the Mo content is 10%, the equiaxed a crystal grain and fine needles β phase are observed. When the Mo contents are 15% and 20%, only the equiaxed β crystal grain is observed. When the Mo content is 10%, the synthetical properties of the Ti-Mo alloy are the best. The data of hardness （HV451）, compression strength （1636 MPa）, compression ratio （22.5%） and elastic modulus （29.8 GPa） were collected. The increase of molybdenum contents is propitious to crystal refinement and improvement of plasticity of Ti-Mo alloys. The dry wear resistance of Ti-Mo alloys against Gr 15 ball was investigated on CJS 111A ball-disk wear instrument. The results show that the dry wear resistance of Ti-Mo alloys is correlative with hardness and mechanical properties. With the ductility increasing, the dry wear resistance reduces. The friction coefficient of 10%Mo alloy is the lowest, the dry wear resistance is the best. The wear particles, wear scar depth and width of the 10%Mo alloy are smaller than that of other Ti-Mo alloys. Considering all kinds of properties of Ti-Mo alloys, 10%Mo alloy is prospective dental prostheses material.     

牙科用Ti-Mo合金的组织及性能特点

在纯钛中加入Mo元素制成二元Ti-Mo合金，测定了Ti-Mo合金的密度、维氏硬度、抗压强度、弹性模量及抗弯强度等性能。实验结果表明：该合金形成了等轴的α＋β组织，Ti-Mo合金的维氏硬度为451，抗压强度为1636MPa，压缩率为22．5％，抗压弹性模量为29．8GPa，抗弯强度为1432MPa，合金的塑性较好，性能优异。Ti-Mo合金是一种有发展前景的口腔修复用钛合金。     

Influence of yttrium on microstructure and properties of Ti-23Al-25Nb alloy after heat treatment

The existence of yttrium in Ti-23Al-25Nb alloy and its influence on the microstructure after heat treatment of Ti-23Al-25Nb alloy were investigated using thermal analysis（DTA）, EPMA, XRD and SEM. The heat treatment was determined based on DTA measurements. The compression tests at room temperature were performed on a Instron-569 universal tester. The results show that yttrium exists as the Y2O3 alloy. The addition of Y doesn＇t affect the characteristic phase transformation temperature At lower quenching temperature, Y strengthens the XRD peaks of O phase by improving the decomposition of B2 phase. Yttrium addition enhances the compression properties with the compression strength, yield strength and compression ratio increasing. The strengthening is attributed to the second phase strengthening of Y2O3 particles and the grain refinement.     

从焊锡阳极泥的浸银渣(锡精矿)中提取锑及金银

本文阐述了从焊锡电解阳极泥浸出渣(锡精矿)中提取锑及金、银工艺流程的理论依据和技术实践的可能性,设计了处理方案和工业设施。     

从焊锡阳极泥中提取锡、银、铅、铋、铜

本文针对某厂所产成份复杂的焊锡阳极泥,采用氧化焙烧,使其中的锡转变为 SnO_2,砷转变为高价氧化物(不挥发),而后用稀盐酸液浸出铜、铋、砷,食盐水浸出银、铅。经较长时间的试生产试验,技术和经济效果均良好,可综合回收锡、银、铅、铋、铜等多种金属。