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Fluorescence of complexes of EuⅢwith aromatic carboxylic acid-1,10-phenanthroline@舒万艮 @周忠诚 @牛聪伟~~  相似文献
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Bioactive and bioresorbable composite was fabricated by a solvent evaporation technique using poly-L-lactide(PLLA) and bioactive glass (average particle size: 6.8μm). Bioactive glass granules are homogeneously distributed in the composite with microcrack structure. The formation of hydroxyapatite(HA) on the composite in simulated body fluid(SBF) was analyzed by scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), X-ray diffraction(XRD), and Raman spectra. Rod-like HA crystals deposit on the surface of PLLA/bioactive glass composite after soaking for 3 d. Both rod-like crystals and HA layer form on the surface for 14 d in SBF. The high bioactivity of PLLA/bioactive glass composite indicates the potential of materials for integration with bone.  相似文献
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1 INTRODUCTIONInrecentyears,manyinvestigationsonfluores cencepropertiesofrareearthions containingpolymercomplexeshavebeenmadebecausethepolymerscanbeusedasluminescenceandlasermaterialswithgoodquality[15] .Okamotoetal[6 8] synthesizedpolymerscontainingcoordinationgroupsandstudiedtheirfluo rescenceproperties .However ,thesynthesisoffunc tionalgroupspolymerswith goodenergydonerandenergylevelmatchingcapabilitywasverycomplicat ed ,whichmadetheuseofpolymerluminescentmate rialsuneconomic[1] .Fur…  相似文献
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采用热压工艺制备FeCrAl纤维增强的FeCrAl(f)/HA生物复合材料,通过金相显微镜、X射线衍射、扫描电子显微镜(SEM)以及能谱(EDS)等测试手段对试样的微观结构及成分进行观察和表征。采用三点抗弯法测定FeCrAl(f)/HA复合材料试样的力学性能。研究结果表明:复合材料的性能随FeCrAl纤维加入得到提高,并随着纤维含量(0~11%,体积分数)的增加逐渐明显下降。HA基体和FeCrAl纤维界面结合紧密,互相咬合较深,并在两相上出现了一定程度的互扩散。FeCrAl(f)/HA生物复合材料的最优化参数如下:纤维直径22μm,长度1-2mm、体积分数7%左右。  相似文献
5.
HA/316L stainless steel(316L SS) biocomposites were prepared by hot-pressing technique. The formation of bone-like apatite on the biocomposite surfaces in simulated body fluid(SBF) was analyzed by digital pH meter, plasma emission spectrometer, scanning electron microscope(SEM) and energy dispersive X-ray energy spectrometer(EDX). The results indicate that the pH value in SBF varies slightly during the immersion. It is a dynamic process of dissolution-precipitation for the formation of apatite on the surface. With prolonging immersion time, Ca and P ion concentrations increase gradually, and then approach equilibrium. The bone-like apatite layer forms on the composites surface, which possesses benign bioactivity and favorable biocompatibility and achieves osseointegration, and can provide firm fixation between HA60/316L SS composite implants and human body bone.  相似文献
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采用热压工艺制备了HA/316L粉非对称生物功能梯度材料(FGM)。HA/316L粉非对称生物FGM在宏观上呈现明显的梯度,微观上则表现出成分连续变化,且各成分分布均匀、弥散。在各梯度层内部及界面都没有裂纹及大孔洞出现,界面结合紧密。随着316L粉的含量增加,韧窝的数量逐渐增加,韧窝形貌由浅变深,边缘由尖锐逐渐变得圆滑,表明材料由脆性断裂向韧性断裂转化。纯HA梯度层为典型的脆性断裂,HA80/316L和HA60/316L梯度层表现为典型的晶间断裂,HA40/316L和HA20/316L梯度层断裂性质为晶间断裂中掺杂有韧性断裂,而316L梯度层则表现为典型的韧性断裂。316L粉的加入改变了HA/316L粉生物FGM各梯度层的断裂方式,从而提高了材料的力学性能。从整体上而言,HA/316L粉生物FGM主要增韧机制包括层间裂纹偏转增韧与裂纹偏转增韧。  相似文献
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Bioactive and bioresorbable composite materials were fabricated from poly-L-lactide and bioactive glass (average particle size 6.8 μm) by a solvent evaporation technique. Cellular cultivation in vitro and MTT assay were conducted for evaluating the influence on morphology, growth and proliferation of cultured fibroblasts. The results of cytotoxicity testing show that cells cultured in extracts of PLLA/BG and on the surface of composites demonstrate normal growth and proliferation. The bioactive glass in PLLA composite facilitates both adhesion and proliferation of rat fibroblasts on PLLA/bioactive glass composite film.  相似文献
8.
通过X射线衍射、X射线光电子能谱、透射电镜、扫描电镜以及能谱分析和电化学方法考察制备路线对氧还原反应(ORR)电催化剂Ag-MnOx/C物理性能及其催化活性的影响。结果表明:通过两步法制得的催化剂(Ag-MnOx/C-2)的表面Ag和Mn含量比一步法制备样品(Ag-MnOx/C-1)的高,这使得Ag-MnOx/C-2具有更高的催化活性。Ag-MnOx/C-2表面ORR的电子转移数高于Ag-MnOx/C-1的电子转移数,且在-0.60 V(相对于Hg/HgO)处的比质量动力学电流为46 mA/μg,为Ag/C的23倍。以Ag-MnOx/C-2为阴极催化剂组装的锌-空气电池的最高能量密度高达117 m W/cm2。  相似文献
9.
The binary complexes of terbium with benzoic acid and its derivatives (phthalic acid, iso-phthalic acid, oaminobenzoic acid, salicylic acid, sulfosalicylic acid) were synthesized and their compositions were identified by elemental analyses. UV, IR of the complexes were investigated. The UV spectra indicate that the complexes‘ ultraviolet absorption is mainly the ligands‘ absorption, but the location of peak drifts. The IR spectra show that the IR spectra of complexes are different from those of free ligands, and the band at 400 - 500 cm^-1 , due to the stretching vibration of Tb--O, is absent for free ligands. The fluorescence properties were investigated by using luminescence spectroscope, the results show that all the six complexes of terbium exhibit excellent luminescence, due to the transition from the lowest excited state ^5D4 to ^7F ground state manifold, the complexes of terbium with sulfosalicylic acid have the strongest fluorescence intensity, and is stronger than o-aminobenzoic acid-terbium, whose fluorescence intensity is regarded as the strongest one in the literature, and even stronger than some phosphor of terbium.  相似文献
10.
采用干粉铺叠法和热压工艺制备了非对称HA/316L不锈钢功能梯度生物材料,并测定了其相对密度和抗弯强度,采用X射线衍射仪、扫描电镜、金相显微分析技术等对材料进行了物相和显微组织分析.结果表明:非对称HA-316L不锈钢生物FGM在宏观上呈现明显的梯度分布,微观上则各成分分布连续、均匀,各梯度层之间没有明显的宏观界面,界面结合紧密;随着316L不锈钢含量的增大,材料的相对密度增加,抗弯强度提高,平均抗弯强度达450 MPa左右,体现出FGM的热应力缓和行为;此外,在生物FGM中,HA和316L不锈钢两相在热压过程中发生了不同程度的固溶,表明HA和316L不锈钢能够形成好的结合.  相似文献
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