真空热压制备W-50%Cu复合材料

采用真空热压制备了W-50%Cu复合材料,对其性能进行了测试,并利用SEM对其微观组织和断口形貌进行了观察与分析.结果表明:在30MPa压力下进行950℃×2h烧结,获得了相对密度达99.6%的W-50%Cu复合材料,其显微硬度、电导率和抗弯强度分别达到133HV、68.9%IACS和285MPa;W-50%Cu复合材料的抗弯断裂表现出塑性断裂特征,其断裂方式主要为沿晶断裂,并伴随少量的穿晶断裂.     

锰系合金市场8月中旬回顾及后市展望

近期华北锰系整体市场现货资源偏紧,钢厂采购吃力,价格持续上涨。目前北方锰硅市场厂家生产正常,生产订单排得很满,部分大型企业由于工人缺乏,增加开工量有些难度。钢厂方面,由于市场现货短缺,供应商低价不出,钢厂采购价格上调。目前锰硅65-17内蒙古地区出厂含税价8600～8700元/吨,宁夏地区价格为8500～8600元/吨,山西地区8600～8700元/吨,河北地区8700～8800元/吨,     

国内铬系合金市场暂稳 静待钢厂出价

近期可能有两家钢厂会考虑9月高碳铬铁采购价格出台。太钢的采购价格出台后,国内市场价格理性回调后一直持稳运行,静待后期钢厂采购价格出台。     

Influence of cyclic frequency on oxidation behavior of K38 superalloy with yttrium additions at 1 273 K

Cyclic oxidation test is a fundamental method to assess lifetime of materials in high temperature environment.Cycle length or cyclic frequency is one important variable in cyclic oxidation testing.In present work,cyclic oxidation tests were performed on cast K38 alloys with 0 wt.%,0.1 wt.%,and 0.5 wt.% yttrium additions at 1 273 K respectively.Two cyclic frequencies were used to investigate the influence of cycle length (1 h vs.20 h) on the high temperature oxidation behavior of superalloy.The results showe...     

Electrochemical performance of compounds Ho_6Fe_(23–x)Co_x (x=0,1,3)

Alloys with composition of Ho6Fe23–xCox (x=0,1,3) were prepared and examined by X-ray diffraction technique and automatic battery testing instrument.The compounds Ho6Fe23–xCox (x=0,1,3) crystallized in cubic Th6Mn23-type structure with space group Fm 3m (No.225).The electrochemical properties of these alloys such as discharge capacity,cycling performance and high rate dischargeability were investigated by battery testing instruments in alkaline electrolyte.Substitution of small amounts of Co for Fe in Ho6Fe...     

Effects of cerium on microstructure and bonding strength of Cu-14Al-4.5Fe bronze plasma sprayed coating

Cu-14Al-4.5Fe bronze powders with and without 0.6% Ce were prepared and their coatings were fabricated on 45# carbon steel substrate by atmospheric plasma spraying. The effects of rare earth Ce on the coating interface bonding strength, coatings and bonding interface vertical sections microstructure were investigated by tensile machine, X-ray diffraction analysis, scanning electron microscopy (SEM) and electronic probe microanalysis (EPMA). The results showed that the shape of powders was more spherical like, and the coating’s hardness and interface bonging tensile strength would be improved to 8.9% and 17.4%, respectively, higher than that of the Cu-14Al-4.5Fe coating without 0.6% Ce added. The refined of κ phases, well distributed matrix phases in coatings and the promotion of Fe, Al elements diffusion led to the improvement in interface bonding strength and hardness of the Cu-14Al-4.5Fe coating with addition of 0.6% Ce, which hardened and strengthened the coating.     

Airware＾TM2l98合金：“猎鹰”家族航空飞行器的支柱

加铝全球航空航天、运输和工业公司（ATI）已经为太空、防御和商业等多种多样的领域提供制造飞行器所需的合金达16年之久,而Airware 2198－T8合金被视为航天航空领域的最佳选择,它的应用使火箭具有更高的强度（增加1O％～30％）和刚度（增加5％）以及密度降低（4％）,自身重量明显减少。     

铁路运输领域“用”铝探讨

铝是一种现代金属,这是Metra公司的管理主任Mario Bertoli在一个对致力于研究轻合金在铁路工业应用的推介会中定义的,这次推介会于5月28日在布雷西亚的“Mile migila”博物馆举办。     

锆及其化合物的应用

锆及其化合物作为新能源、新材料,具有相当重要的意义。锆合金优异的核性能,成为核燃料包壳管的首选材料;氧氯化锆是生产金属锆、氧化锆和其他锆化合物的中间产品;氧化锆具有增韧的特性,极好的力学性能,是结构陶瓷的最好材料。     

性能优异的“玻璃合金”

在美国科幻影片《终结者2》中,一个名叫“villain”的液体合金机器人无所不能,可以变形成任何物体。现在,科学家们已经制造出比电影中液体合金更优异的金属材料——“玻璃合金”,它比工业上最好的钢还坚硬3倍,弹性强10倍。换句话说,它几乎可以成为“终结者”的强劲对手。