Significantly enhanced photoelectrochemical cathodic protection performance and preventing biofouling dual functional Cu_(2)ZnSnS_(4)/TiO_(2)nanotube composite material

A new type of photoelectrochemical cathodic protection technology(a combination of seawater corrosion and biological fouling resistance)is being actively researched to alleviate the serious corrosion of marine metal materials.At present,there is almost no research on anti-corrosion and anti-fouling dual functional materials.In this paper,Cu_(2)ZnSnS_(4)is attached to the surface of TiO,nanotubes through a one-step hydrothermal method for modification.The results indicate that when the hydrothermal reaction time is 24 h,Cu_(2)ZnSnS_(4)/TiO_(2)nanocomposite material exhibits excellent performance in coupling with the protected 304 SS,with its open circuit potential shifts negatively to-1.04 V.This material improves the separation efficiency of photogenerated electrons and effectively improves the photochemical cathodic protection of 304 stainless steel.The high removal rate of Staphylococcus aureus(up to 93%)of the as-prepared samples also proved that it has the effect of the anti-biological fouling.

循环热处理对93W–5Ni–2Fe高比重钨合金冲击韧性的影响

采用粉末冶金法制备成分(质量分数)为93W-5Ni-2Fe的高比重钨合金试样,对高比重钨合金试样进行循环1200℃真空热处理+淬火热处理,通过冲击韧性测试和扫描电镜断口形貌分析,研究了同一热处理工艺下,循环热处理次数对高比重钨合金冲击韧性的影响。结果表明:随着循环热处理次数的增加,材料的冲击韧性逐渐升高,第4次循环热处理后冲击韧性达到115 J·cm^(-2),当进一步增加循环热处理次数后,材料的冲击韧性不再有明显变化;高比重钨合金的冲击断口由第1次热处理后多为钨晶粒解理断裂,逐步过渡为钨晶粒之间粘接相的韧性断裂。

钨合金的高温力学性能及断裂机制研究

本文选用粉末冶金法制备93W-5Ni-2Fe合金,通过高温拉伸试验研究了合金在1 000、1 100、1 200、1300和1 400℃的高温力学性能,通过扫描电镜对高温拉伸后的试样进行断口分析,研究了合金在高温环境下的断裂机制演变规律。结果表明:93W-5Ni-2Fe合金在1 000~1 400℃的抗拉强度、屈服强度、伸长率、断面收缩率和弹性模量均随着温度的升高而急剧降低,随着温度的不断升高,材料表现出明显的脆性断裂,钨颗粒本身未发生穿晶断裂,断裂模式为粘结相撕裂和钨相与粘结相界面断裂。