Effect of different storage media on the microhardness and wear resistance of resin-matrix ceramics

This in vitro study evaluated the microhardness and two-body wear of various computer-assisted design and computer-assisted manufacturing (CAD/CAM) resin-matrix ceramic materials stored in different storage media. For each material (Paradigm MZ100, Lava Ultimate, Vita Enamic, and Cerasmart), 40 disk-shaped specimens (8 mm diameter × 3 mm thickness) were prepared and divided into four subgroups (n = 10) according to storage material (artificial saliva, distilled water, 0.02 mol/L citric acid, 3:1 ethanol/water). Following storage at 37°C for 7 days, microhardness was measured with a Knoop test, and wear was measured using a 3D scanner and surface analysis program before and after loading on a chewing simulator (200 000 cycles). Wear values of Vita Enamic were lower in comparison to the other materials tested (P < 0.001). Storage media were found to have a significant effect on material microhardness (P < 0.001), but not on wear (P = 0.820).     

纳米材料改性树脂基耐烧蚀材料研究新进展

综述了近年来纳米材料改性树脂基耐烧蚀材料的研究进展。介绍了碳纳米管、石墨烯、蒙脱土、纳米SiO2、纳米碳粉等纳米材料在改性烧蚀材料中的研究近况,详细探讨和比较了改性材料的热稳定性、成炭率、力学性能等,同时分析了纳米材料改性树脂材料中存在的问题,并预测了纳米材料改性耐烧蚀树脂的发展趋势。提出纳米材料,特别是新型的纳米碳材料改性树脂基耐烧蚀材料的研究将是很有发展前景的研究领域,并会进一步得到人们的重视。     

固体润滑剂及其在树脂基减摩复合材料中的应用

本文对固体润滑剂及其在树脂基减摩复合材料中的应用进行综述,并对各种润滑剂及其在树脂基减摩复合材料中的润滑机理进行分析,最后提出固体润滑剂及减摩复合材料的未来发展方向.     

树脂基复合材料界面及界面表征

在树脂基体和成型工艺一定的条件下，碳纤维表面及表面涂层的性质在很大程度上决定了复合材料界面的性质，通过对ＣＦ表面进行性改及改变ＣＦ表面涂层的性质，可优化界面，最大限度发挥界面的特性，有用了界面微脱粘仪及透射电镜照片伪彩色处理对界面进行直观表征。     

新型耐高温树脂基减摩复合材料及纳米固体润滑剂的制备与应用

综述了近年来国内外几种新型耐高温树脂基减摩复合材料和几种新型纳米固体润滑剂,介绍了它们的性质、制备方法、应用以及树脂基减摩复合材料的减摩机理,分析了耐高温树脂基减摩复合材料存在的问题,并提出了今后的发展方向.