磁控溅射HA(+YSZ)/Ti6Al4V复合涂层的微观形貌和生长方式

采用磁控溅射方法在钛合金(Ti6A14V)基体上制备了HA( YSZ)复合涂层.利用X射线衍射仪(XRD)分析涂层的物相组成,扫描电镜(SEM)观察涂层的表面形貌,原子力显微镜(AFM)分析涂层的生长状况,划痕法测定涂层与基体的附着力.结果表明,用磁控溅射法可在Ti6Al4V基体上制备HA( YSZ)复合涂层,涂层组成与靶材基本相似,涂层呈多孔状,划痕法测量涂层的附着力约为80N,涂层的生长模式为层状生长加岛状生长.     

磁控溅射法制备HAF/YSZ梯度复合涂层及生物性能研究

采用射频磁控溅射技术在Ti6Al4V基体上成功制备了含氟羟基磷灰石梯度复合涂层(HAF/YSZ)。利用X射线光电子能谱(XPS)、电子探针(EDX)、扫描电镜(SEM)等对涂层的成分分布、形貌、界面结合进行表征。通过模拟体液(SBF)实验,分析和评价了HAF/YSZ涂层在模拟人体条件下的生物性能。结果表明,所制备涂层表面粗糙,呈多孔岛状结构,有利于新生骨组织的生长;涂层与基体结合紧密,各层间相互扩散,整体一致性较好;经模拟体液浸泡后,涂层表面有新生物质沉积,表现出较好的生物活性及稳定性;梯度复合涂层较氟含量单一的氟羟基磷灰石涂层具有更好的抗体液溶解能力及稳定性。     

三维钛网表面双生物陶瓷涂层的制备及其性能

采用浸渍涂敷-烧结法首次在医用三维钛网表面制备出双生物陶瓷涂层,利用X射线衍射、场发射扫描电子显微镜对HA-BG/BG/Ti复合材料进行了微观表征,拉伸法测量了Ti基体与BG涂层的结合强度,模拟人体体液(SBF)评价复合材料的生物相容性.研究表明:该双生物陶瓷涂层的内层为生物玻璃(BG)涂层,外层为多孔结构的羟基磷灰石-生物玻璃(HA-BG)复合涂层.Ti基体被致密的BG涂层包覆,由于在BG/Ti界面发生化学反应,界面的结合强度提高,平均结合强度达27 MPa.生物相容性实验表明,HA-BG/BG/Ti复合材料表面会被一层整齐、致密的HA覆盖,具有良好的生物相容性.     

磁控溅射HA（＋YSZ）／Ti6A14V复合涂层的微观形貌和生长方式

采用磁控溅射方法在钛合金（Ti6A14V）基体上制备了HA（4-YSZ）复合涂层。利用X射线衍射仪（XRD）分析涂层的物相组成，扫描电镜（SEM）观察涂层的表面形貌，原子力显微镜（AFM）分析涂层的生长状况，划痕法测定涂层与基体的附着力。结果表明，用磁控溅射法可在Ti6A14V基体上制备HA（＋YSZ）复合涂层，涂层组成与靶材基本相似，涂层呈多孔状，划痕法测量涂层的附着力约为80N，涂层的生长模式为层状生长加岛状生长。     

Ti6Al4V表面HAF/YSZ梯度复合涂层的制备和性能

采用射频磁控溅射技术在Ti6Al4V基体上制备含氟羟基磷灰石(HAF)梯度复合涂层,对涂层的氟含量、物相组成及形貌进行了表征,并分析了梯度复合涂层在模拟人体条件下的生物活性和稳定性。结果表明:复合涂层中的氟呈梯度分布,n(Ca)/n(P)随着涂层中氟含量的增加逐渐减小。HAF/YSZ(Y_2O_3稳定的ZrO_2,简称YSZ)复合涂层在SBF环境下生成的新物质为碳酸类骨磷灰石,氟促进磷灰石相的发育,氟含量呈梯度分布能有效提高涂层的抗体液溶解能力和与基体间的结合性能;HAF/YSZ梯度复合涂层比无氟羟基磷灰石及氟含量单一的涂层具有更好的生物活性和稳定性。     

纤维涂层法制备SiCf/Cu复合材料及其性能分析

为研究纤维涂层法制备SiCf/Cu复合材料的性能特点,通过磁控溅射法先后将Ti6Al4V界面改性层和基体Cu涂层涂覆到SiC纤维表面,并通过真空热压法将被涂覆的纤维制备成SiCf/Cu复合材料.对Ti6Al4V涂层、Cu涂层以及复合材料进行了微观分析,并测试了复合材料的拉伸强度.研究表明,复合材料的Cu基体由致密而细小的晶粒组成;Ti6Al4V提高了纤维/基体界面结合强度,复合材料轴向抗拉强度高达500 MPa,界面脱粘主要发生在纤维表面的碳涂层与纤维之间.     

射频磁控溅射制备 HA(+ZrO2+Y2O3)/Ti6Al4V 复合生物活性涂层

采用射频磁控溅射法制备了HA（＋ZrO2＋Y2O3）／Ti6Al4V生物复合涂层．借助于XRD、SEM、FTIR和AFM等对溅射涂层的相组成、微观形貌和界面结合进行了研究，并以模拟体液试验探讨了涂层的生物活性．实验结果表明：磁控溅射的复合涂层呈非晶态，经过退火处理，可以使其转化为晶态；复合涂层的微观表面凹凸不平，并呈现网状结构和较多的孔隙，其孔隙直径约为0．5-2．0μm，孔隙面积占涂层表面积的30％-40％；HA（＋ZrO2＋Y2O3）／Ti6Al4V复合涂层的界面结合强度随（ZrO2＋Y2O3）复合颗粒含量的增大和溅射功率的提高而增强，最高可达59．6MPa．复合涂层在模拟体液中浸泡一段时间后，表面覆盖一层新生物质—含有CO^2-3的类骨磷灰石，其晶粒非常小，它与自然骨中无机相的结构成分相似，表明复合涂层具有良好的生物活性．     

Ti-6Al-4V合金基体等离子喷涂生物活性羟基磷灰涂层的研究进展

系统阐述了在钛合金(Ti-6Al-4V)表面等离子喷涂羟基磷灰石(HA)涂层的研究进展.描述了等离子喷涂制备HA涂层的工艺过程、微观形貌和化学组成.综述几种综合性能较高的复合型涂层:HA/BG(生物活性玻璃)复合涂层,HA/ZrO2复合增强型涂层,HA/Ti涂层,HA/Ti-6Al-4V梯度涂层;并对HA涂层发展趋势进行了展望.     

仿生磷灰石涂层与钛基体结合强度的划痕法实验

本文采用碱热处理及SBF浸泡的方法在钛片上制备了仿生磷灰石涂层,并采用AES进行表面成分-深度分析,划痕法测定磷灰石涂层与基体的结合强度.结果显示,经碱热处理而制得的钛表面仿生磷灰石涂层与基体结合的界面为成分梯度界面,二者的结合要通过成分含量呈梯度变化的过渡层:Ca、P元素的含量从表面到基体逐渐下降,Ti元素的含量逐渐上升.热处理有利于提高涂层的基体结合强度,其原因是热处理使SBF中形成的磷灰石的晶核细小而均匀,使得表面涂层与基体之间的结合更为紧密.预钙化处理后形成的磷灰石涂层与金属之间仍为成分梯度界面,因此对涂层的基体结合强度影响不大.     

喷涂功率对碳/碳复合材料表面羟基磷灰石涂层的影响

采用等离子喷涂技术在碳/碳复合材料表面制备了羟基磷灰石(HA)涂层,采用电子拉伸机和自制装置测定了不同喷涂功率下涂层与基体的抗剪强度,采用扫描电镜观察了涂层表面、剪切断裂表面的形貌,采用电子探针分析了试样截面的形貌和成分线分布.结果表明:随着喷涂功率的增加,涂层中HA颗粒的熔化程度和涂层与基体的抗剪强度均增加,涂层与基体的界面属于机械结合,其剪切断裂的形式主要有界面失效和涂层内部失效两种.     

Checking of DIIV-1, DINIR-1, and DINS-1 instruments

Conclusions As follows from what has been said, the amount of specific measurements during the checking of DINIR-1 and DINS-1 instruments is quite large. Taking into account the constant addition to the inventory of these instruments as they are being produced, it is desirable, in the authors' opinion, to consider the problem of developing and subsequently producing a special instrument intended for the checking of various types of time interval meters.Translated from Izmeritel'naya Tekhnika, No. 6, pp. 77–81, June, 1971.     

Electrical properties of some (1, 1, 1) intermetallic compounds

Many intermetallic compounds form with a gap in their density of states at the Fermi level, giving rise to relatively large Seebeck coefficients, on the order of –150 to –300 V/deg. at room temperature. Consequently, when combined with reasonable carrier mobilities in the range of 30 to 50 cm2/V-s, half-Heusler compounds, such as MNiSn where M = (Ti, Zr, Hf), become attractive candidates for intermediate temperature (300°C to 600°C) thermoelectric applications. Samples of TiNiSn were prepared by arc melting and homogenized by various heat treatments. The temperature dependence of the electrical resistivity, Seebeck coefficient, and thermal diffusivity of these samples was characterized between 22°C and 900°C. The electrical resistivity and thermopower both decrease with increasing temperature, consistent with semiconducting behavior. The electrical power factor, defined as S2/ where S is the Seebeck coefficient and is the resistivity, appears quite sensitive to the degree of homogenization in the microstructure and values in excess of 25 W/cm-°C2 were observed in nearly single phase alloys within the 300 to 600°C temperature range. A brief survey of other selected ternary intermetallic compounds is also presented.     

Thermal conductivities of hex-1-ene,hept-1-ene,oct-1-ene,and dec-1-ene at 302–374 K

Measurements are reported on the temperature dependence of the thermal conductivity for olefins in the vapor state.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 55, No. 2, pp. 250–255, August, 1988.     

Hyper-cross-linked porous polymers based on 1, 1, 1-trimethyl-3, 3, 3-triphenyldisiloxane and their applications in water treatment

Journal of Materials Science - A series of new hyper-cross-linked porous polymers (HCP-TTDs) were successfully prepared by the Friedel–Crafts alkylation reaction of 1, 1, 1-trimethyl-3, 3,...     

Phase studies in the systems CoS1bMnS,CoS1bZnS,and CoS1bCdS

Phase relationships of the systems CoS1bMnS, CoS1bZnS, and CoS1bCdS are given based on X-ray diffraction. Rocksalt type MnS, sphalerite type ZnS, and wurtzite type CdS form solid solutions with cobalt sulfide. The unit cell dimensions of the Mn_1?xCo_xS, Zn_1?xCo_xS, and Cd_1?xCo_xS mixed crystals obey Vegard's law. Lattice constants of hypothetical rocksalt, sphalerite, and wurtzite type CoS have been extrapolated to be a_o = 505, a_o = 534, and a_o = 380, c_o = 625 pm. The solubility limits determined from lattice constant measurements are 23, 41, and 20 mol% CoS at 1000° C. The solubility of cobalt sulfide in MnS, ZnS, and CdS decreases with decreasing equilibrium temperature. In the case of MnS and CdS the solubility increases with increasing Co/S ratio of the cobalt sulfide, viz. Co₉S₈, CoS (mixture of Co₉S₈ and Co_1?xS with 1 : 1 ratio of Co/S), and Co_0.97S. No detectable solubility of MnS, ZnS, or CdS in cubic Co₉S₈ could be observed. A possible incorporation of little amounts of these sulfides into NiAs type Co_1?xS cannot be excluded.     

The vapor pressure of 1, 1-dichloro-2, 2, 2-trifluoroethane (R123)

The vapor pressure of 1, 1-dichloro-2, 2, 2-trifluoroethane (R123) has been measured at temperatures between 256.4 and 453.8 K by ebulliometric and static techniques. These results have been combined to obtain a correlation for the vapor pressure from 256.4 K to the critical temperature.