V.E.Ovcharenko
,
Baohai YU
,
S.G.Psakhie
材料科学技术（英文）
An experimental investigation were performed on the effect of the impulse electron-beam irradiation upon microstructure of the surface layer and on wear resistance of a cutting tool for sintered TiC/NiCr cermet. The results showed that the surface electron-beam treatment of the TiC/NiCr cermet is an efficient method for investigating the microstructure and phase composition in the surface layer of the powder composite and there are optimal regimes of electron-beam treatment, which ensure a substantial increase in the resistance of the cermet to wear during cutting of metals.
关键词:
Cermet
,
null
,
null
,
null
,
null
Yongwei ZHU
金属学报(英文版)
The effect of nanodiamond content in electrolyte and rotational speed of the stirrer on the deposition rate of coatings, the nanodiamond content in coatings, the micro-structure and the micro-hardness of coatings were studied. A self-made pin-on-disk tribo-meter was employed to evaluate the wear resistance of prepared coatings. Results show that the thickness of composite coating decreases with the rotational speed, while the micro hardness of coating and the content of nanodiamond in coating increase with increasing its content in electrolyte. The wear resistance of the composite coating deposited in an electrolyte with 6 g/L nanodiamond increases by 50 % in contrast with the pure Ni-P coating.
关键词:
Nanodiamond
,
Composite electroless plating
,
Micro-hardness
,
Wear resistance
Yan GAO
,
Zhenjia WANG
,
Quanyou MA
,
Ge TANG
,
Ji LIANG
材料科学技术（英文）
Epoxy resin modified by nanometric γ-alumina or multi-walled carbon nanotubes (MCNTs) was prepared with solution mixing method, and the wear resistance of the composite was studied. The results show that when an optimum amount of nanometric alumina or MCNTs is filled in epikote51 (E51), the wear resistance of the composite will increase. When 8 wt pct nanometric γ-alumina is filled in E51, the wear resistance of the composite increases to 230%. When 10% MCNTs is filled in E51, the wear resistance of the composite increases to 226%. When nanometric alumina is filled in, the wear resistance of modified epikote51 will increase as the cure temperature is heightened.
关键词:
Epoxy resin
,
null
,
null
,
null
王树奇
,
朱韬
,
茅奕苏
材料科学与工艺
采用销盘式高温摩擦磨损实验机,针对一种新型铸钢、H13和H21钢在25-400℃下进行磨损试验,对比研究各种钢的耐磨性,并探讨了磨损机制.研究表明：室温下H21钢由于具有较多的未溶碳化物,比H13钢和铸钢具有高的耐磨性;在200-300℃下铸钢和H13钢随载荷的增加一直具有较低的磨损率和增长率,而H21钢当载荷达到200 N时磨损率忽然升高;在400℃下铸钢具有持续低的磨损率,明显低于H21和H13钢.可见,新型铸钢具有比常用热锻模具钢显著高的高温耐磨性.
关键词:
热锻模具钢
,
新型铸钢
,
耐磨性
,
磨损机理
于斌斌
,
袁军堂
,
汪振华
,
胡小秋
,
王飞
新型炭材料
利用阳极离子束技术在SKD11型不锈钢和YG6硬质合金上沉积类金刚石( DLC)薄膜,采用扫描电子显微镜、原子力显微镜、Raman光谱分析薄膜微观结构和表面形貌；采用WS-2005型附着力划痕仪和洛氏压力机测试膜基结合强度；采用球磨仪测试膜层耐磨性能。结果表明：利用该技术所制DLC膜是一种非晶结构、表面平整的薄膜,粗糙度Ra 值仅为5.21nm。DLC/Cr/SKD11膜系Raman光谱ID/IG值(0.69)高于DLC/Cr/YG6膜系(1.54),说明SKD11高于YG6所制膜层的sp3C键含量；DLC/Cr/SKD11膜系结合强度(17.8 N)低于DLC/Cr/YG6膜系(39.2 N),且DLC/Cr/YG6膜系的洛氏压痕周围仅有放射状微细裂纹,而DLC/Cr/SKD11膜系的压痕周围存在膜层脱落现象；沉积在SKD11与YG6基体上DLC膜的单位磨损率分别为1.40E-4和8.81E-5,说明YG6基体上DLC膜层的耐磨性要优于SKD11基体上的DLC膜层。由此看出,不同基体上制备的DLC膜层微观结构不同,导致结合性能及耐磨性能不同。
关键词:
阳极离子束技术
,
类金刚石膜
,
结合强度
,
耐磨性
王培
,
叶源盛
表面技术
doi:10.16490/j.cnki.issn.1001-3660.2015.08.008
目的：优化钛合金激光熔覆固体润滑涂层的熔覆工艺参数,提高钛合金表面耐磨性能。方法采用Nd：YAG激光器,分别在高功率和低功率条件下,在TC4钛合金表面制备h-BN固体自润滑涂层。观察分析熔覆陶瓷层的宏观形貌、物相组成、显微组织和硬度,采用摩擦磨损试验仪对熔覆层的摩擦学性能进行研究。结果低激光功率下,熔覆材料上浮流失严重,熔覆层的相成分主要是TiN,TiB,TiB2等硬质相,硬度较高,存在裂纹。高激光功率下,基材的熔化稀释较好地抑制了润滑相h-BN的上浮,减少了溅射损失,发生了包晶反应,生成了单质金属Ti,熔覆层硬度低,但摩擦磨损试验表明,涂层中润滑相h-BN含量的增加使得形成了更好的润滑膜,降低了摩擦系数。结论在输出电流400 A,脉宽5 ms,频率12 Hz,扫描速度120 mm/min,搭接率50%~60%的条件下进行激光熔覆,所得熔覆层的表面状态平整,耐摩擦性能最好。
关键词:
激光熔覆
,
TC4钛合金
,
h-BN
,
自润滑涂层
,
摩擦系数
,
耐磨性能
