Kaijin HUANG
材料科学技术（英）
The microstructure and wear behaviour of the thermite reaction coating produced by the hybrid laser cladding-remelting on AA7075 aluminum alloy for the systems of Al-CuO-SiO2, Al-Cr2O3-SiO2, Al-Fe2O3-SiO2, and Al-TiO2-SiO2 were studied. The results of the X-ray diffraction (XRD) analysis show that in all the four reaction coatings, α-Al2O3 and γ-Al2O3 phases were present at the top surface, together with various intermetallic phases, the corresponding reduced metal and Al phase in the fusion zone. Under the dry sliding condition, the wear resistance, in terms of weight loss, of the laser-clad specimens was considerably higher than that of the untreated specimen. The predominant wear mechanism of the former specimens was abrasive wear, while for the latter, it was the adhesive wear that prevailed.
关键词:
Laser cladding
,
cladding
,
thermite
,
reaction
,
aluminu
张松林
,
张庆明
,
秦志桂
,
田梅
硅酸盐通报
为探索对锕系核素污染沙土进行玻璃或陶瓷固化的有效途径,采用了铝热剂自蔓延高温合成(SHS)固化的模拟实验.主要进行了铝热剂粉末SHS固化的原理分析、模拟物质的选择、单质铁中模拟物质的含量、固化体中模拟物质浸出率的实验等.结果表明,固化体中模拟元素铈、铒的浸出率为10~(-3)～10~(-5) g·m~(-2)·d~(-1)量级;X射线衍射分析、扫描电镜观察发现,固化体中含有模拟元素铈、铒的硅酸盐晶体,晶体周围分布着大量玻璃体;单质铁相中模拟元素含量极低.用铝热剂可以固化锕系核素污染的沙土.
关键词:
锕系核素
,
污染沙土
,
铝热剂
,
SHS固化
陈伟
,
姜炜
,
李平云
,
刘梨
,
陈斌华
,
戴骏骏
,
王龙祥
,
袁远
,
李凤生
稀有金属材料与工程
采用机械球磨法制备不同比例的Al-Mg合金,然后采用超声分散法制备AlMg/KMnO4铝热剂.通过DSC、点火温度和燃烧性能测试对AlMg/KMnO4铝热剂进行了性能表征.结果表明:随着镁含量的增加AlMg/KMnO4反应温度明显降低,表明其热反应活性优于Al/KMnO4;此外随着Mg含量(质量分数)从10％增加到50％,点火温度和燃烧速度分别从723 K降低至493 K和254 mg/s降至204mg/s,其中Al0.5Mg0.5/KMnO4火焰溅射范围大幅提高.
关键词:
铝镁合金
,
机械球磨
,
含能材料
,
铝热剂
,
高锰酸钾
