利用工业固体废渣制备新型建筑材料的研究进展

日益增加的工业废渣已成为社会公害,由工业固体废渣引起的环境污染和社会问题正受到世界各国的高度关注,工业固体废渣的合理利用成为国民经济和社会发展中迫切需要解决的重大问题。简要介绍了国内外工业固体废渣利用现状,研究了几种工业固体废渣的化学组成、物相组成特点,探讨了工业固体废渣的无害化、减量化和资源化利用途径,提出了基于废渣化学组成协同-互补-相克效应基础上的废渣最佳组合和最大化利用概念与方法,介绍了作者团队近年在固体废渣的高掺量、高附加值利用开发研究方面的最新成果,指出了利用工业废渣制备建筑材料未来应重点研究的内容与方向。

超薄铝硅酸盐玻璃离子交换工艺与性能研究

选择纯KNO_(3)为熔盐,采用一步法和二步法对可用于手机显示屏的超薄玻璃进行离子交换强化。利用EDS对离子交换玻璃的离子浓度分布进行测试表征,研究了离子交换温度(380℃~440℃)、时间(1 h~12 h)对玻璃的离子交换深度、表面应力、显微硬度、透过率及化学稳定性的影响。结果表明:温度的升高和时间的延长有利于玻璃表面应力和显微硬度的提高,但当温度超过400℃,且时间超过2h后,玻璃出现应力松弛效应;二步法增大了离子浓度梯度,进一步提高了玻璃的表面应力和显微硬度;离子交换过程在不降低透过率的同时提高了玻璃致密度及化学稳定性。相关结论对手机显示屏领域超薄玻璃的强化具有指导意义。

Comparison between vitrified bond and resin bond diamond grinding wheel in grinding PDC

In this research,the advantages and disadvantages of the cylindrical grinding process of Polycrystalline Diamond Compacts(short for PDC) with vitrified and resin bond diamond grinding wheel are compared.The research results show that the vitrified bond diamond grinding wheels,which use Ti-coated diamond grains as abrasive and glass ceramic as bond,have many advantages in grinding PDC.Compared with resin diamond grinding wheel,vitrified bond wheels lead to 35% grinding cost reduced,40% grinding time of each PDC saved,and the size precision of PDC improved(from ±0.03mm to ±0.01mm).When grinding feed is <0.10 mm,the grinding ratio increases with increased grinding feed.However,when the grinding feed exceeds 0.10 mm,the grinding radio decreases rapidly with the increasing of grinding feed.The disadvantage of this kind of grinding wheel is that the brightness of the ground PDC cylinder is not as shining as that processed by resin bond diamond grinding wheel.