【摘 要】
：
NieAl alloy coatings with different Y additions are prepared on 45# medium steel by laser cladding. The influence of Y contents on the microstructure and proper
【机 构】
：
State Key Lab for Materials Modification
论文部分内容阅读
NieAl alloy coatings with different Y additions are prepared on 45# medium steel by laser cladding. The influence of Y contents on the microstructure and properties of NieAl alloy coatings is investigated using X-ray diffraction, scanning electron microscopy, electron probe microanalyzer, Vickers hardness tester, friction wear testing machine, and thermal analyzer. The results show that the cladding layers are mainly composed of NiAl dendrites, and the dendrites are gradually refined with the increase in Y additions. The purification effect of Y can effectively prevent Al2O3 oxide from forming. However, when the atomic percent of Y addition exceeds 1.5%, the extra Y addition will react with O to form Y2O3 oxide, even to form Al5Y3O12 oxide, depending on the amount of Y added. The Y addition in a range of 1.5e3.5 at.%reduces the hardness and anti-attrition of cladding layer, but improves obviously its wear and oxidation resistances.
其他文献
目的 观察右心室高位间隔联合右心房起搏治疗慢性充血性心力衰竭的临床疗效.方法 10例慢性充血性心力衰竭患者,行右心室高位间隔联合右心房起搏治疗,于术前3 d、术后3个月及6
目的:观察黄荆子乙酸乙酯提出物(EVn-50)诱导人急性髓性白血病HL-60细胞分化作用。方法:体外培养HL-60细胞,MTT法测定细胞活性;瑞氏-吉姆萨染色法观察细胞分化形态学变化,间
[目的]总结并分析住院新生儿死亡病例的主要死因. [方法]调查本院2000年1月1～2007年7月31日死亡新生儿的病历资料,描述住院新生儿死亡病例的一般情况以及各期新生儿的主要死因
目的:了解临床护理人员医疗锐器伤的发生情况,并探讨相应的防护对策.方法:对某院430名临床护理人员及实习护生发放自行设计的医疗锐器伤问卷调查表,进行半年内回顾性调查、分
目的 建立测定感冒灵颗粒中对乙酰氨基酚含量的方法.方法 采用HPLC法, C18色谱柱为岛津(250 mm×4.6 mm,5 μm),以甲醇-水-冰醋酸(20∶80∶0.5)为流动相,检测波长:244 nm,流
手术导航系统作为现代影像技术、立体定向技术、电子计算机技术和人工智能技术相结合的产物,近年来得到了迅速的发展和应用。本文就手术导航系统的概念和基本原理、发展情况
本文从印度传统医学与中医药的相互影响,临床诊断、治疗方法与中医药的异同等方面进行了阐述.
自身免疫性肝炎(autoimmune hepatitis,AIH)是一种以高球蛋白血症,多种自身抗体阳性及汇管区呈碎屑样坏死(界面性肝炎)为特征的肝脏炎症性病变.内科激素及免疫抑制剂治疗可缓
寻常型天疱疮是一累及皮肤和黏膜的自身免疫性大疱性皮肤病,在各型天疱疮中最常见.国内外一直在进行其发病机制的研究,目前尚不完全清楚,其中.最有影响的是桥粒芯糖蛋白的补
Nano hexahydro-1,3,5-trinitro-1,3,5-triazine(RDX) was prepared using a bi-directional rotation mill and dried under different conditions(liquid, temperature and