简介:研究了不同成分的二元系HA-Ti和三元系HA-BG-Ti复合生物材料的烧结收缩率、抗压强度、抗弯强度、微观结构、物相结构及化学成分等.结果表明:二元系HA-Ti复合材料烧结收缩率变化曲线一直呈下降趋势,从11.2%降至3.3%;三元系的烧结收缩率变化曲线呈"S"形,先降低后升高再降低(23.1%→16.2%→21.8%→17.1%),且HA-BG-Ti三元系复合材料的烧结收缩率普遍高于HA-Ti二元系的烧结收缩率.当钛含量达到50%~60%时,HA-Ti系复合材料的抗压强度达到最小值68MPa,而HA-BG-Ti系复合材料的抗压强度却达到最大值131MPa;二元系复合材料的抗弯强度停滞在40MPa左右,而三元系复合材料的抗弯强度曲线在钛含量为70%~75%时出现最大值64MPa;总体上,三元系的抗压强度和抗弯强度均高于二元系的抗压强度和抗弯强度.由于HA-BG-Ti复合材料中的HA-Ti相界面依托生物玻璃以复杂的强键相结合,HA-Ti系复合材料的HA-Ti相界面存在CaTiO3等脆性相,因而从理论上解释了HA-BG-Ti三元系复合材料的力学性能好于HA-Ti二元系复合材料的力学性能的原因.
简介:Inthispaper,agradientbioactivecoatingmadefrommodifiedbioglass(BG)andhydroxyapatite(HA)waspreparedbyelectrophoreticdepositionmethod(EPD)onthesurfaceoftitaniumalloy.StrongbondingbetweenthematrixandBG/HAgradientcoatingwasgotbysintering.CrystalcompositionofthecoatingwasanalyzedbyXRD.ThecharacteristicsofsurfaceandcrosssectionofthecoatingwereobservedbySEM.Adhesivestrengthofthecoatingwastestedbypullmethod.Theoptimizingtechnologicalparametersweredetermined.
简介:ThehotrollingexperimentinvestigatesintotherelationshipbetweenthemicrostructuresandthemechanicalpropertiesofNb-TimicroalloyedsteelswithvariousTicontents.TheresultsindicatethattheeffectofthebainitefractionofNb-TimicroalloyedsteelsontheyieldstrengthofthesteelsisnotrelatedtoTicontent,whiletheslopeoftheHall-PetchrelationshipdecreaseswiththeincreaseofTicontent.Accordingly,theMisramodelfortheyieldstrengthofNb-Timicroalloyedsteelsismodified,andthefactorswhichcausethechangeintheslopeofHall-Petchrelationshiparediscussed.
简介:ThemorphologiesevolutionofvarioustypesofinclusionsinTi-IFsteelwereobservedbyaspecialdeptherosionmethod,andtheformationandevolutionprocesswerediscussed.TheresultsshowedthatthemaininclusionswereFeO·xMnObeforeAldeoxidizationandtheratioofintegratedoxygenandfreeoxygenwasinrangedof0.3to0.4.Inpresentstudy,themaineffectfactorsonthemorphologiesofAl2O3inclusionswere[Al]/[O]Free(solublealuminumdividefreeoxygen)andinitialfreeoxygen;clusterAl2O3wasformedeasilywithhighfreeoxygen([O]Free)andlow[Al]/[O](blew3inpresentstudy).Otherwise,thedendriticAl2O3wasformed;coral-likeAl2O3wasthemixtureofthedendriteAl2O3andsphericalAl2O3.SomeAl2O3·TiOxinclusionsappearedbecauseahigh[Ti]concentrationregionexistedaround70TiFe(containing70percenttitanium)particlesafter70TiFeaddition.ThemaximumsizesofAl2O3reached800μmwhen3minaluminumwasadded;asthetimepast,thelargesizeAl2O3decreasedsignificantly;themaximumsizeofAl2O3wasblew100μmand50μmincalmingsampleandtundishsamplerespectively.
简介:摘要目的构建BMSCs/COL-HA复合体,考察BMSCs在两种材料上的黏附与增殖,为探索更适合牙周缺损再生的组织工程支架材料提供依据。方法利用冷冻干燥仿生矿化的方法制备COL-HA。结果本实验在王晓敏,林晓艳等学者研究的基础上采用冷冻干燥的方法制备胶原-羟磷灰石多孔复合材料,并对部分材料进行交联处理,比较两种材料的生物学性能,进一步利用犬骨髓间充质干细胞BMSCs作为种子细胞,构建BMSCs/COL-HA复合体,考察BMSCs在两种材料上的黏附与增殖,为探索更适合牙周缺损再生的组织工程支架材料提供依据。