Antibacterial Activity of TiO₂/Ti Composite Photocatalyst Films Treated by Ultrasonic Cleaning

In this work, TiO2/Ti composite films were fabricated by 2-setp MCT and the following high temperature oxidation. Antibacterial activity of the composite films treated by ultrasonic cleaning to increase the performance reliability was examined. The prepared TiO2/Ti composite films showed high photocatalytic activity in the degradation of methylene blue solution. It is obvious that? TiO2/Ti composite films have antibacterial activity under UV irradiation.

Fabrication of Ti-Ni-Mo-Si composite coating by reactive braze coating process

Ti-Ni-Mo-Si composite coating was fabricated on mild steel by reactive braze coating process with Ti61. 9Ni24. 6Si4. 411409.1 （ wt. % ） powders as the raw materials. Microstr^cture of the coating was characterized by optical microscopy, scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy and micro-hardness tester. Results indicate that the Ti-Ni-Mo-Si composite coating is metallurgically bonded to the mild steel substrate and has high hardness. The microstructure of the coating consists of the reinforcement of Ti5 Si3 and Mo9 Ti4 particles and the matrix of eutectic NiTi2. Due to the poor wettability of NiTi2 liquid at low temperature, TisSi3 and Mo9 Ti4 do not uniformly distribute in the NiTi2 matrix.

自润滑TiN-MoS_2复合涂层的制备和摩擦性能

由Ｔｉ（（ＣＨ３）２Ｎ）４／ＮＨ３／ＭｏＦ６／Ｈ２Ｓ气体混合物把ＴｉＮ和ＭｏＳ２分散相组成的复合涂层共沉积到石墨和Ｔｉ６Ａｌ４Ｖ合金载体上。室温下空气中的摩擦系数处在０．０７～０．３范围内，６７３Ｋ时增大到０．７～１．０，而９７３Ｋ时则约为０．３。

成膜参数对TiN—MoS_2/Ti复合薄膜摩擦学性能的影响

本研究利用钻削、切削实验及XPS测试等手段考察了非平衡纳米复合等离子体镀膜技术中成膜参数对TiN—MoS2 /Ti复合涂层的摩擦学性能及其理化性能的影响。实验发现靶距、沉积气压及Ti添加剂含量等参数的变化对复合涂层的成分和性能产生了明显的作用。结果表明 ,通过调整选择合适的工艺参数 ,可以得到较高耐磨寿命的TiN—MoS2

Hot Corrosion Behavior of SiO_2–Al_2O_3–Glass Composite Coating on Ti–47Al–2Cr–2Nb Alloy: Diffusion Barrier for S and Cl

Type Ⅰ hot corrosion behavior of SiO_2-Al_2O_3-glass composite coating based on Ti-47 Al-2 Cr-2 Nb substrate was investigated in the mixture salt of 25 wt%NaCl + 75 wt%Na_2SO_4 at 850 °C. The results showed that there was a bidirectional ion exchange between composite coating and the film of mixed salts, and the sodium ion in the molten salts penetrated into the glass matrix of composite coating, while the potassium ion in the glass matrix dissolved into the molten salts. A decrease in hot corrosion rate was achieved for the coated alloy in comparison with the bared substrate due to the composite coating acting as a diffusion barrier to sulfur and chlorine and preventing the molten salts from diffusing to the coating/alloy interface during the hot corrosion exposure. Additionally, the composite coating decreased the oxygen partial pressure at the coating/alloy interface and promoted the selective oxidation of Al to form a protective Al_2O_3 layer.

Microstructure and Tribological Properties of TiB_2/TiB/TiN_x(x=1,0.3)/Ti Composite Coating Produced on Pure Ti by Laser Surface Alloying

TiB2/TiB/TiNx(x=1,0.3)/Ti composite coating was prepared on pure Ti by laser surface alloying by using powders of boron as starting materials.The composite coating was examined by X-ray diffraction(XRD),high-resolution transmission electron microscopy(HRTEM)and scanning electron microscopy(SEM).The friction and wear properties of the composite coating were examined using a pin-on-disk tester under dry sliding wear condition.The results showed that the top surface of the composite coating was mainly composed of TiB2,TiB,TiN0.3,TiN and Ti phases,while the interface of the composite coating was composed of TiB and Ti phases.The composite coating showed sticklike structure near the top surface,and dendrites structure near the interface.The friction and wear test showed that the composite coating had better wear resistance than pure Ti due to their higher microhardness than that of pure Ti substrate.

非平衡纳米复合等离子体镀膜法沉积二硫化钼复合膜的摩擦学性能的研究

本文结合国内外固体润滑膜的发展趋势 ,以及当前材料发展中有关“多相材料”的新理念 ,提出了一种新的固体润滑膜沉积方法———非平衡纳米复合等离子体镀膜法 (NCUPP)。采用该法成功地对几种材料 (Ti、N、Mo、S等 )进行精细的纳米复合 ,制备的固体润滑膜TiN MoS2 /Ti是多相纳米复合膜 ,其中的MoS2 基本上呈准非晶态 ,掺杂物Ti与MoS2 多相复合 ,形成了多相的纳米复合薄膜 ,具有良好的摩擦学性能 ,即摩擦系数低 ;耐磨损寿命长 ;