共查询到20条相似文献，搜索用时 15 毫秒
1.
李燕怡 《商洛师范专科学校学报》2014,(4):49-53
通过制备模拟体液来模拟人体环境对制备的多孔生物活性陶瓷进行生物相容性测试,将模拟体系温度、pH分别控制在36．5±1．5℃、7．3±1．5。将制备的多孔生物陶瓷浸泡在1．0倍与1．5倍的模拟体液中,分别培养2,4,6d。通过SEM观察培养之后多孔陶瓷材料的表面发现：培养生物玻璃多孔材料生长的羟基磷灰石状况良好,随着在模拟体液中生长时间的增加,生物玻璃矿化产生羟基磷灰石含量剧增以及磷灰石形貌发生变化。培养2d磷灰石在材料表面以及多孔内部延伸,羟基磷灰石生长尺寸可达到20μm,随时间延长玻璃表面生长出尺寸为10—100μm的树枝状结构磷灰石,培养6d有形状规则的片状磷灰石生成,尺寸达到100μm以上。 相似文献
2.
The objective of the study is the cytocidal and inhibitory effect of energy-controllable pulse on ovarian cancer cell line SKOV3.Ovarian cancer cell suspension were treated by electric pulse with different parameters,.The inhibitory rate(IR) was assayed by modified colorimetric MTT methods,the growth curves of two test groups and one control group were also measured.and the ultrasturctureal changes were observed under electron microscopy(EM) and scan electron microscopy (SEM),It was found that the treated SKOV3 cell proliferated more slowly.IR was increased with the enhancement of pulse paramters,The ultrastructural study showed that morphological changes occured obviously.Swollen mitochondria,fracutured ridges,cytoplasmic vacuoles and membrane holes appeard in most of the processed cells,and a part of bilayer membrane was ruptured.It is indicated that irreversible electric breakdown occurred in some of the treated cells,and the electric pulse could kill cancer cell and inhibit its recovery and growth. 相似文献
3.
柯跃前 《泉州师范学院学报》2008,26(4):63-66
添加不同含量的稀土氯化物LaCl3,制备了纳米晶体镍,采用透射电镜（TEM）和环境扫描电镜（ESEM）观察镀层的微观组织和结构．结果表明：添加LaCl3可以明显提高镀层表面光洁度、耐蚀性能,在加入1g／L LaCl3时,镀层具有最佳耐蚀性能． 相似文献
4.
采用HL-5000型横流CO2激光加工机在TC4钛合金表面激光熔覆TiC+Ti和TiC+Ti+F102复合涂层。通过SEM、EDAX、XRD、HXD-1000TMC型显微硬度计,HT-600型高温摩擦磨损试验机,分析了熔覆层的显微组织、成分、物相,测试了激光熔覆层的显微硬度和滑动摩擦磨损性能。结果表明,激光熔覆制备的TiC复合涂层与基体呈冶金结合,在TiC+Ti激光熔覆层中,熔覆层的组织是在Ti基体上分布着TiC树枝晶;在TiC+Ti+F102激光熔覆层中,TiC颗粒发生了部分溶解,熔覆层的组织是在Ti基和γ-Ni基的基体上分布着细小的TiC颗粒和TiC树枝晶。TiC+Ti激光熔覆层的硬度约为700 HV0.1,TiC+Ti+F102激光熔覆层的硬度约为800 HV0.1,两种复合涂层耐磨性均比TC4钛合金显著提高。 相似文献
5.
室温下,以Ti（S04）22-6g／L,H2021-2g／L,NaF3-5g／L,EDTA2-6g／L为转化液的主要成分,加入1-2g／LCe（N03）3 ．6H20促进转化膜的致密性和均匀性,控制转化液pH4．0-4．5,转化处理10min,在样品表面制备一层化学转化膜．通过中性盐雾测试和电化学测试表征转化膜的耐蚀性,采用冷场发射扫描电镜（SEM）观察转化膜的微观形貌,X射线能谱仪（EDS）分析转化膜的化学成分．结果表明：该转化膜耐蚀性优艮,EDS能谱分析得出这层颗粒状物质主要由Na,A1,F元素和少量的Mg,Ti,O元素组成,推断转化膜的主要成分为Na3AIF6,铈盐起到促进转化膜致密性和均匀性的作用． 相似文献
6.
HONG Quan QIAN Ying LI Lingjie ZHANG Shengtao College of Chemistry Chemical Engineering Chongqing University Chongqing P. R. China 《重庆大学学报(英文版)》2004,3(1):69-73
1.IntroductionDuringthepastyears,avarietyofsurfacetreatmentshavebeenusedtoincreasecorrosionresistanceofaluminumalloys.SinceHintonandhiscolleaguesfirstreportedthecorrosioninhibitionwithrareearthmetalsaltsforAA7075aluminumalloys[1],muchattentionhasbeenpaidtotheroleofrareearthadditivesintheareaofsurfacetreatmentsofaluminumanditsalloys.However,mostoftheseresearchesfocusedonrareearthconversioncoatingsformedbychemicalconversionmethods[2-8],theapplicationofrareearthmetalsaltsinanodizingofaluminumall… 相似文献
7.
采用均匀设计液相涂覆热扩散方法，研究了涂覆离子，热扩散条件等对SrTiO3系陶瓷电性能的影响；用扫描电子显微镜（SEM）作微观分析，X射线能谱仪作元素分析，证实钠离子（Na＋）的涂覆热扩散未在陶瓷晶粒之间产生新相，钠离子（Na＋）在晶粒内表面形成了一扩散层，讨论了扩散条件与电性能的内在联系． 相似文献
8.
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. 相似文献
9.
用常规的陶瓷工艺制备SnO2-Co2O3-Nb2O5-Y2O3陶瓷. 采用XRD、SEM来对陶瓷的微结构进行表征,详细研究了温度对陶瓷电学行为的影响. 结果表明:烧结的陶瓷结构致密,在陶瓷样品中,除了SnO2相之外,没有发现其他相,在晶粒与晶粒之间没有观察到明显的晶粒层. 在直流电条件下,陶瓷具有明显的稳定的变阻器行为,随着温度的升高这种行为减弱,电导率增大,表现出半导体行为. 这些事实可以归因于陶瓷中的固熔体和晶格中各种缺陷的形成. 相似文献
10.
本文研究了PbO气相扩散及其热扩散工艺条件对半导化SrTiO3基陶瓷的介电性能(ε)、介电损耗 (D)、非线性系数 (α)及电阻率 (ρ)的影响 .用SEM和EPMA对微观结构进行了观察和分析 ,结果显示PbO主要集中在晶界附近 .用PbO气相扩散法成功地获得了εapp>50 0 0 0、D <0 .0 35、α >6 .5、ρ >4× 1 0 9的SrTiO3基多功能陶瓷 相似文献
11.
Experimental investigations of the micro cracking behavior of a coating-substrate structure were carried out in-situ with a scanning electron microscope (SEM). An anodized coating layer was deposited on an AZ91D substrate by the galvanize pulse method. Results indicated that the failure mechanism of the coating-substrate structure was due to a mismatch of micro deformation between the coating and substrate. The micro deformations induced by different failure models were cracking, spalling, or delamination. The failure models were validated using theoretical, experimental, and digital image correlation methods. The critical stress of failure can be evaluated by measuring the biaxial stress. 相似文献
12.
采用覆层测厚仪、SEM、电化学工作站等研究了脉冲占空比和频率对Mg-4Gd-3Y-0．5Zr微孤氧化膜的生长、表面微观形貌和耐腐蚀性能的影响．结果表明,占空比、频率对膜层厚度影响较小;随着脉冲频率的增加,氧化膜袁面微孔数量增多、孔径减小,粗糙度降低;而随着占空比的增加,变化趋势则相反;膜层耐蚀性随频率和占空比的增加均先增强后降低,最佳频率和占空比分别为600Hz、10％． 相似文献
13.
The main thrust of this research was to determine the effectiveness of polyvinyl alcohol (PVA) powder in enhancing the durability of short GFRC materials. Accelerated aging of the materials was achieved through low-pressure steam curing in a moist chamber. The strength and ductility of GFRC were measured by the direct tension test, which showed that incorporation of PVA powder into GFRC could improve its mechanical behaviour and turn it from brittle to ductile. To investigate the mechanism of the tensile strength enhancement, the fiber-matrix interface was examined by polarizing optical microscopy and scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDAX). It was found that PVA powder tended to migrate to the fiber-matrix interfacial zone and thus prevented the accumulation of calcium hydroxide in this area. PVA film around the fiber resulted in a more ductile interfacial microstructure and better bonding between fiber and matrix, which should be responsible for enhancing the tensile property and preventing the aging of GFRC. Furthermore, PVA powder reduced the microhardness and brittleness at the interface. 相似文献
14.
研究了共聚物P（MPEGMA／AA）中单体聚乙二醇单甲醚甲基丙烯酸酯（MPEGMA,分子量550）、丙烯酸（AA）摩尔配比对阻垢分散性能的影响,并用X衍射（XRD）和电子扫描电镜（SEM）观察了碳酸钙垢晶型变化．结果表明,当共聚物中MPEGMA摩尔含量为1％～5％,共聚物具有较好的阻垢分散性能;ρCa^2＋为625mg／L,ρhco3^-为600mg／L,阻垢剂用量20mg／L时,阻碳酸钙率达70％以上;阻垢剂用量为5mg／L,阻磷酸钙率达80％以上,分散氧化铁上层清液最小透光率为62％．阻垢剂的侧链聚醚对碳酸钙垢具有晶格扭曲和分散作用． 相似文献
15.
研究载氟氧化铝中氟含量的测定方法,采用氟离子选择电极在PH为6～7的总离子强度调节缓冲溶液介质中,氟离子浓度在0.475～4.75ug/ml之间呈现良好线性关系,方法灵敏性和选择性较好,回收率在96.8%～101.6%之间.能够很好的应用于载氟氧化铝中氟含量的测定. 相似文献
16.
根据电场能促进骨细胞生长这一生物学特点,设计一种新型的既能填充骨缺损又能刺激骨细胞形成的仿生人工骨材料,从众多的压电陶瓷中选取BaTiO3、从活性生物材料中选取Ca3（PO4）2为主要原料,辅以助熔剂、成孔剂等添加剂,合成压电相与磷酸三钙复合型生物陶瓷人工骨（BTTCP）,确定合适的制备工艺,并用XRD、SEM、EPMA等现代测试手段对其组成、性能及微观结构的关系进行探讨和分析,为骨缺损的修复探索一条新途径. 相似文献
17.
用ON、XRD、SEN、EDAX等对经不同制备工艺获得的AITiB和新型AITiBRE中间合金细化剂进行了微观组织的观察分析比较。结果表明：地TiBRE中间合金中细化相主要为TiA13和TiB2，还存在着不稳定的（AITiRE）相；地TiBRE中间舍金中细化相质点的分布形态优于A13TiBRE中间合金；氟盐法所制备的地TiBRE中间合金中细化相的分布更为均匀弥散与细小，优于纯Ti粉颗粒法制备的地TiBRE中间合金的组织。 相似文献
18.
杨春蓉 《福建工程学院学报》2017,(6):555-558
以工业纯钛为基体,采用仿生法制备钛基磷酸盐涂层复合材料。对钛基进行酸碱活化处理和热处理后浸入模拟体液进行矿化,分析碱液浓度和处理时间、热处理温度等因素对钛基表面活性的影响。研究发现,当碱溶液浓度为9 mol/L、处理时间为10 h时,钛基体的表面粗糙度和表面能达到最大;随着热处理温度升高,钛基在模拟体液中矿化形成的磷灰石增多。但当热处理温度超过700 ℃时,钛基体表面的二氧化钛凝胶层结构改变,钛表面层与溶液的离子交换能力下降,磷灰石形成量减少。该研究可为钛及其合金在骨植入材料中的临床应用提供理论和实践依 相似文献
19.
在以甲基磺酸锡为主盐、硫脲为电位调整剂的镀液体系中,在铜箔上制备了呈缎面光泽的均匀锡镀层.镀覆过程,用电偶电流法进行了分析;对所得镀层的显微组织结构,采用FE-SEM和XRD进行研究.结果表明,在该镀液体系中浸镀锡,镀覆过程迅速而平稳,所得锡镀层具有体心四方的晶体结构,镀层显微形貌为均匀分布的颗粒状形态. 相似文献
20.
以十六烷基三甲基溴化铵（CTAB）为有机模板,加入到丙三醇和水的混合溶液中制备碳酸钙并在其母液中进一步合成羟基锡酸锌包覆碳酸钙.通过XRD,SEM,TG-DSC分别对产物的晶型、形貌、热解行为进行了分析,并研究了CTAB浓度对碳酸钙的形貌和晶体结构的影响.结果表明：碳酸钙为枝状文石型碳酸钙,羟基锡酸锌较好的包覆在枝状碳酸钙表面,当CTAB质量浓度为2.2 g/L时,枝状晶体形态最好. 相似文献