Preparation of bone-like apatite coating on surface of Ti-25Nb-2Zr alloy by biomimetic growth method

A bone-like apatite layer consisting of nano-crystals of apatite phase was prepared on the surface of Ti-25Nb-2Zr alloy by chemical biomimetic growth method. TiNbZr alloy specimens were first oxidized at 500℃ for 2 h in the air. Then, they were immersed in 40℃ saturated Na2HPO4 solution for 15 h and 25 ℃ saturated Ca(OH)2 solution for 8 h in turn for pre-calcification. The pre-calcified specimens were immersed in modified simulated body fluid up to 15 d for biomimetic growth. After common oxidization, amorphous titania and anatase were detected on the specimen surface. Except for the substantial amount of calcium and phosphorus, no new phase appeared on the pre-calcified specimens. After the coating process, it was found that the (002) orientation was the preferred orientation during the growing period of hydroxyapatite. The inorganic composition and structure of the coating are very similar to those of human thigh bone, which will be advantageous for its application as biomedical material.     

健康新知

好消息 金银花提取物可防日晒 随着酷热夏季的到来,强烈的日照会对皮肤造成损伤。科学家报告说,中草药金银花的一种提取物,可以用做衣物的高效天然涂层,带有这种涂层的衣物可保护人们不受太阳紫外线的伤害。这项最新研究报告发表在美国化学学会主办的《工业与工程化学研究》杂志上。     

船舶各施工阶段涂层保护要点及措施

涂层保护一般从分段涂装以后开始,直至船舶交付出厂,是一项极为重要且烦琐的管理工作,需要各专业、各部门通力合作才能体现出效果,将涂层保护的效果看作是反映完整性施工水平的窗口,提高和强化船舶建造过程中施工人员的油漆保护意识,同时在生产工作中严格按照上述要求执行,只有这样才能控制好涂层的破坏,把涂层破损率降低到满足规范要求范围之内。     

园林工程施工技术应用之我见

在园林工程建设工作当中多年跟据个人对园林施工中的相关技术应用提出了一些个人的观点.     

学校后勤供应商目录资料

企业名称:广东五星太阳能股份有限公司通讯地址:广东省东莞市万江区流涌尾管理区联系电话:0769-22176388公司网站:http://www.fivestarsolar.com五星第四代高效平板太阳能,推出吸热比高达95%的蓝膜涂层技术,采用超白布纹特种玻璃精制而成,静载承重1.5吨不破碎,具有高效、安全可靠、可承压运行、性价比高、更好实现太阳能与建筑一体化五大特点。     

后处理对多弧离子镀NiCoCrAlY涂层高温氧化性能的影响

用多弧离子镀在镍基高温合金K417G上制备了NiCoCrAlY涂层,对涂层进行了1050℃真空退火4小时、粉末包覆渗铝、1100℃下预氧化1小时等后续预处理：研究了涂层在1000℃下的高温氧化行为结果表明：真空退火处理使涂层组织更致密,涂层形成β＋α＋γ／γ′多相平衡组织,轻微降低了涂层退化倾向;     

核电用钢加工刀具分析

SA508 Gr.3 Cl.2钢是制造核反应堆球体类零件的理想钢种,已在核电球体类零件中广泛应用。本文对该材质的球体类零件在立式车床加工中所用刀具进行了研究分析,为刀具选型提供了依据。     

光盘档案的保护

光盘盘片主要由盘基、保护层和存储介质(记录层)导向槽和盘套等部分组成,为了更好地保管光盘档案,档案工作者需要了解光盘的组成要素及其特性.通常,根据光盘组成材料的不同成分,在保存时需要尽可能的延长光盘基础材料和记录介质材料的耐久性.有些光盘盘基是用铝合金、铝、铜等金属材料制成的,还有采用镀金方法制成的"金光盘";金属光盘盘基的特点是不易变形、不破碎,不足之处是在潮湿和高温条件下易氧化、锈蚀.     

Inverse method for the determination of elastic properties of coating layers by the surface ultrasonic waves

INTRODUCTION The elastic properties of coating layers in coating materials are very important in the design and evaluation for engineering purpose. They can serve as ground knowledge in the selection of surface coatings for particular applications, and can be used to monitor the quality of physical processes (Every, 2002). Therefore, estimation of the elastic properties of coating layers is of great practical value. Much effort has been put into measuring the material properties of coatin…     

光轴任意取向各向异性超常介质涂层平板镜像波导模式特性

本文对光轴任意取向各向异性超常介质涂层平板镜像波导的横电波（TE模）的特性进行了细致分析与推导,得到了特征方程及其色散关系式,以及时间平均坡印亭矢量式,并进行了相应的数值模拟,描绘出它们各自的特性曲线,得出光轴任意取向各向异性超常介质涂层平板镜像波导的模式,既不同于各向同性左手介质涂层中的,也不同于各向同性常规介质层的导波特性。