间歇式溶液添加法制备片状HAP

在研究HAP的表面结构、表面电荷性能、表面吸附特性的基础上，对现有的水溶液制备HAP的方法进行改进，不用通常的缓慢而持续滴加反应溶液的方法，而采用间歇式反应溶液滴加法，再通过控制溶液的pH值（7.0-7.5)以及反应溶液的添加次序等，最终得到片状HAP晶体。用X－射线衍射分析，红外光谱分析，扫描电镜形貌观察，对片状HAP的性能及结构进行分析，并对Cl^-的作用机理进行了初步探讨。     

影响纳米羟基磷灰石溶胶在水介质中分散性能的因素

目的：探讨影响纳米羟基磷灰石溶胶分散性能的因素。方法：以水分散体系下，采用化学共沉淀法制备的纳米HAP，研究了反应介质pH值、稳定剂或表面改性剂等因素对纳米粒子粒径及分散稳定性的影响。结果：调节介质的pH值，使颗粒间处于较高的静电效应，在此条件下加入表面活性剂，使颗粒间又具有空间位阻稳定效应，空间位阻稳定效应可阻止颗粒间的团聚。结论：通过优化实验条件可制得高度均匀分数状态纳米羟基磷灰石溶胶。     

FH—98加氢精制催化剂在低压HT装置的工业应用

对FH一98催化剂在低压加氢装置的工业应用进行了总结,对出分析了催化剂的加氢脱硫、脱氮、烯烃饱和活性。在现有的操作条件丁,FH一98催化剂的加氢活性基本能够满足产品质量的要求。指出HT装置难以适应当前日趋劣化的原料,为低压HT装置进行适应性改造提供参考依据。     

可降解多孔β-磷酸钙生物陶瓷的制备研究

本文采用湿法制备β-磷酸三钙（β-TCP）粉末，以玻璃为黏结剂，经高温烧结后，添加造孔剂混合后热压铸成型，经过高温处理，制备出可生物降解的β-TCP多孔材料。经X-射线衍射和扫描电镜形貌分析，证明材料主晶相是β-TCP，材料内部有大量连通的均匀微孔。溶解测试表明材料具有一定的溶解性。材料的制备工艺可实现规模化生产。     

Electronic microscopy analysis of HAP single crystals prepared by hydrothermal method

Hydroxyapatite(HAP,Ca10(PO4)6(OH)2in one of the quite important bone implant materials.The hydroxyapatite crystals were synthesized under hydrothermal condition.The specimen was verified to be HAP crystal by the X-ray powder diffractometry(XRD).Then the specimen was distinguished single crystal from polycrystal by the use of the transmission electron microscope(TEM).The diffraction pattern of the specimen is neatly affanged diffraction spots,that verified the crystals were single crystals.The interplanar distance d calculated from diffraction spot is coincided with that of HAP‘s JCPD card.Moreover,crystal face angles calculated from crystal face index are coincided with the values by measuring on the pattern.The HAP crystals are needle-like in shape with about 3μm in diameter and 180μm in length.Most of the crystals are whiskers.Their length/diameter ratio ranges from 40 to 100.The average ratio is about 60.     

纳米HAP粒子在水介质中的分散稳定性研究

在水分散体系中采用化学沉淀法制备纳米羟基磷灰石（Hydroxyapatite，HAP）粒子，研究了分散介质pH值、稳定剂或表面改性剂及其分子量等因素对纳米粒子粒径及分散稳定性的影响，重点讨论了阴离子表面活性剂PAA-Na（聚丙烯酸纳）对纳米HAP溶胶分散稳定性的影响。同时对纳米HAP溶胶分散稳定性机理在理论上作了探讨。     

通过仿生法在硅橡胶表面制备磷灰石薄膜的研究

用CaCl2的乙醇溶液和K2HPO4溶液对硅橡胶进行预处理,将处理过的硅橡胶分别浸渍于模拟体液和钙磷饱和溶液中来制备磷灰石薄膜.利用薄膜X射线衍射、红外吸收光谱和扫描电子显微镜对形成的薄膜进行了表征.结果表明,分别在模拟体液中7d和在钙磷饱和溶液中5d后,硅橡胶表面形成了一层磷灰石薄膜;在模拟体液中的薄膜表面呈网状并分布有许多球状晶粒,在钙磷饱和溶液中的薄膜为结晶良好的片状晶体.     

热轧厂层流冷却系统存在的问题及改造

分析了武钢热轧厂层流冷却系统存在问题,采用调节水箱与调速水泵运行相结合的改造方案,并解决了变频电机轴承承载能力不够问题,从而满足了生产需要,提高了产品质量,降低了能耗。     

含部分碳酸根的针状羟基磷灰石晶体的均相合成

选用可溶性的硝酸钙和磷酸氢二铵,在尿素用作添加剂的条件下用均相沉淀法合成了含部分碳酸根的针状痉基磷灰石晶体。同时给出了碳酸根对羟基磷灰石晶体阴离子的转换及反应对碳酸根含量的影响的定性分析。还讨论了体系温度、营养料浓度、添加剂种类对晶体长度及长径比等性能的影响。实验结果表明,用尿素作添加剂合成羟基磷灰石时,晶体中含有部分碳酸根,碳酸根对羟基和磷酸根均存在部分替代,其含量仅与体系温度有关,而营养料的浓度、添加剂的水解速度和体系温度对晶体的长度和长径比有直接影响。在钙磷离子浓度积为4－50(mmol/L)^2。温度为82－95℃时,用均相沉淀法可以获得长度为50－150μm,长径比为40－100的针状羟基磷灰石单晶体。     

Preparation and Characteristics of Hydroxyapatite Whiskers by Homogeneous Precipitation Method

Hydroxyapatite whiskers were prepared by the homogeneous precipitation method. Soluble calcium ion and phosphate ion were used as initial materials, they were refluxed respectively at 85℃ , 90℃ and 95℃ for various lengths of time. A proper precipitation agent was selected to control the releasing speed of ions in the system; it induced the hydraxyapatite crystal to grow in a desired way. The pH values of each solutions were measured continuously during the reaction. After the reaction, the products were characterized by X- ray powder dif-fractometry (XRD), scanning electron microscopy ( SEM) and infrared spectroscopy (IR). It is shown that long hydroxyapatite whiskers were obtained under the conditions of 95℃ - 48h and 90℃ - 12h, 85℃ - 120h.