Ti3Al含量对TiC/(Ti3Al+ZrO2)陶瓷复合材料晶粒生长及性能的影响

采用机械合金化和热压烧结制备了TiC/(Ti3Al+ZrO2)复合材料.研究了1550℃烧结温度下,不同Ti3Al含量(10、15、20、25;质量分数)对复合材料烧结及力学性能的影响.结果表明:随着Ti3Al含量的增加,烧结体致密化程度提高,抗弯强度和硬度相应提高,但当Ti3Al超过一定量时,强度、硬度又有所降低.     

二维四角TiC单层片上的析氢反应研究

电解水是目前获得氢气的高效方法之一.过渡金属碳化物因其廉价且在析氢反应(HER)中表现出较高的催化活性而备受关注.我们利用第一性原理首先计算了新型二维四角TiC单层片的稳定性及电子性质,进而计算其表面不同活性位点、不同氢覆盖率下的吸附能、吉布斯自由能(△ GH*)等属性,并且将对应的微观结构进行了系统分析比较,同时结合...     

First-principles Density Functional Theory Elucidation of the Hydrogen Evolution Reaction on TM-promoted TiC2 (TM=Fe,Co, Ni,Cu, Ru,Rh, Pd,Ag, Os,Ir, Pt,and Au)

Single-atom-catalyst-based systems have been attractive by virtue of their desirable catalytic performance. Herein, the possibility of the 15 transition-metal (TM)-promoted (TM=Fe, Co, Ni, Cu, Zn, Ru, Rh, Pd, Ag, Cd, Os, Ir, Pt, Au, and Hg) and their hydrogen evolution reaction (HER) performance were investigated on two-dimensional titanium carbides (TiC₂). It is found that the adsorption strength of TMs on TiC₂ is stronger than that of TMs on γ-graphyne and weaker than that of TMs on Ti₃C₂. Among the fifteen investigated catalysts, Ru−TiC₂, Ag−TiC₂, Ir−TiC₂, Au−TiC₂, and Fe−TiC₂ exhibits overpotential of −0.18, −0.15, −0.18, −0.17, and −0.04 V, respectively. In addition, the Volmer-Tafel step was preferred to the Volmer-Heyrovsky step on Fe−TiC₂. This work suggests that Fe−TiC₂ is possibly a superior HER electrocatalyst.     

TiC颗粒含量及尺寸对原位TiCp／Fe复合材料耐磨性的影响

研究了ＴｉＣ颗粒的含量不寸对原位ＣｔＣｐ／Ｆｅ复合材料耐磨料磨损性能的影响。结果表明：当ＴｉＣ颗粒的尺寸为５．０μｍ时,复合材料的耐磨性随ＴｉＣ颗粒含量的增加而提高;在ＴｉＣ颗粒的含量为１０．１％,尺寸小于５．０μｍ时,复合村料的耐磨性随尺寸的增大而提高;而当颗粒尺寸大于５．０－μｍ后,耐磨性因ＴｉＣ颗粒的剥落反而下降,分析认为,复合材料的耐磨性与其组织中ＴｉＣ颗粒的间距密切相关,间距赵小,复合材