共搜索到2527条信息，每页显示10条信息，共253页。用时：0小时0分0秒616毫秒
becomes homogeneous gradually with increasing the hydrogen gas pressure and withdraw rate. The porosity decreases with increasing the hydrogen gas pressure, while it is independent of the withdraw rate... to the decrease of the average pore diameter and the increase of the pore number density. Key words: porous material; lotus-type porous Cu; continuous casting Gasar process; porosity Gasar工艺是一种利用金属-气体共晶定向凝固......
printing is close to the theoretical density of alloy. The porosity of 80Ni20Cr alloy fabricated by laser 3D printing technology using layer-layer orthogonal route is lower than that of layer-layer...; porosity Foundation item: Projects(11372100, 51562027) supported by the National Natural Science Foundation of China; Project(YC2015-S311) supported by Jiangxi Province Graduate Innovation Fund, China......
such as density, porosity, hardness and tensile strength. The results were compared with basic matrix alloy. Furthermore, the OM, SEM with EDAX and XRD analyses were carried out to analyze the dispersion... particles were well bonded with matrix alloy with clear interface. It was also found that the density decreased with increase in mass fraction of BLA particles and porosity increased with increase......
......
-cell aluminum foam prepared by counter-gravity infiltration casting method increases with the particle size decreasing and with the porosity and thickness increasing. Key words: open-celled aluminum foams; counter-gravity infiltration casting; sound absorption coefficient; porosity 泡沫铝是一种新型超轻多孔功能结构材料,它结合了多孔结构的特性和金属的性能.由于泡沫铝的轻质结构及吸能等特性,使其在结构材料和功能材料方面有着广泛的应用前景[1-4].特别是开孔泡沫铝,由于其独特的孔连通结构,使得其成为由无数个减振吸声单......
of Materials Science and Engineering, Chongqing University, Chongqing 400044, China Received 27 December 2014; accepted 14 May 2015 Abstract: The porosity of titanium foams obtained from the space holder technique was theoretically analyzed in the cases of volume shrinking, retaining and expanding during sintering. The relationship between porosity and spacer content was compared under different......
文献标识码: A Preparation of porous Al with high porosity by infiltration method ZHANG Wei-kai, LI Nai-zhe, HE De-ping (Department of Materials Science and Engineering, Southeast University, Nanjing 210096, China) Abstract: Porous Al with high porosity (70%-90%) and high degree of pore-opening(25%-50%) was obtained by controlling the quantity of molten Al. The effects of infiltration pressure......
Ti/Al异种合金激光熔钎焊过程气孔形成机制 陈彦宾1,陈树海1,李俐群1 (1.哈尔滨工业大学,现代焊接生产技术国家重点实验室,黑龙江,哈尔滨,150001) 摘要:采用矩形光斑CO_2激光为热源,以AlSi12作为填充焊丝进行钛/铝异种合金的激光熔钎焊试验,发现气孔是导致接头失效的一个主要因素.结果表明,钛/铝异种合金激光熔钎焊的气孔缺陷主要是由镁元素的气化所致.光束的偏移量及激光功率是影响气孔产生的主要因素.界面棒状的金属间化合物长度低于10 μm时一般不产生气孔,而气孔的直径与焊缝内部的微观组织有关. 关键词:激光熔钎焊; 钛/铝异种合金; 气孔倾向; 粘度; laser welding-brazing; Ti/Al dissimilar alloys; porosity tendency; viscosity; [全文内容正在添加中] ......
and then briquetting. The strength and porosity of oxidized pellet increase firstly and decrease afterwards in the whole process of microwave heating. The observation of scanning electron microscopy shows...: direct reduction; microwave field; oxidized pellet; volumetric heating; true porosity 微波在冶金中的应用是近几十年来微波能应用的一个重要方向,它在冶金过程中具有快速加热,整体加热,选择加热以及高频振荡强化冶金过程等优 点[1-4].另外微波能作为一种清洁,干净有效的能源用来加热物......
to pull-out of the irregular shaped composite particles. The 50% SiC MMC suffers from composite particle fracture porosity after high pressure die casting (HPDC). Key words: CSIR–RCS; HPDC; SiC; F condition; T6 condition; wear rate; hardness; porosity 1 Introduction Metal matrix composites (MMCs) are natural materials of choice for wear sensitive applications. Attractiveness for making MMC......
