掺杂WC/Co的Al_2O_3/TiC/Ni系梯度功能材料

掺杂ＷＣ／Ｃｏ的Ａｌ２Ｏ３／ＴｉＣ／Ｎｉ系梯度功能材料研究了添加ＷＣ／Ｃｏ的Ａｌ２Ｏ３－ＷＣ－Ｃｏ／ＴｉＣ／Ｎｉ系梯度功能材料（ＦＧＭ）的力学性能,该材料是以Ａｌ２Ｏ３／ＴｉＣ／Ｎｉ系为基体,在表面层Ａｌ２Ｏ３中添加ＷＣ－Ｃｏ系组分制成的对称型ＦＧＭ...     

爆炸固结加自蔓延高温合成Ti／Al2O3梯度功能材料

采用爆炸固结加自蔓延高温合成（ＳＨＳ）法制备了Ｔｉ／Ａｌ２Ｏ３梯度功能材料（ＦＧＭ），并对所制备的ＦＧＭ的成分、组织和性能进行了研究。实验结果表明，采用该法可制备成分、组织和性能呈梯度分布、且符合设计要求的致密ＦＧＭ。此外还研究了Ｔｉ／Ａｌ２Ｏ３ＦＧＭ合成过程中的反应模式     

Fe含量对自蔓延高温合成TiCAl_2O_3Fe复合材料的影响

采用ＳＨＳ／ＰＨＩＰ 工艺制备了致密的ＴｉＣＡｌ２Ｏ３Ｆｅ 复合材料。研究了Ｆｅ 含量对燃烧温度、燃烧波速度、合成产物密实度及力学性能的影响。结果表明, 燃烧波速度在一定Ｆｅ 含量范围内出现一近似平台; 密实度随Ｆｅ 含量变化而变化, 在Ｆｅ 含量为１０ ％ 时, 产物的密实度最高, 为９９ ．４ ％ ; 随着Ｆｅ 含量的增加产物的抗弯强度不断提高, Ｆｅ 含量为１０ ％ 和３０ ％ 时, 抗弯强度分别为７４０ ＭＰａ 和９７０ＭＰａ 。     

TiC-Ni-Mo金属陶瓷的SHS法合成

利用自蔓延高温燃烧合成结合准热等静压技术（ＳＨＳ／ＰＨＩＰ）成功地制备了高致密度的ＴｉＣ２４Ｎｉ６Ｍｏ金属陶瓷（ＴＮ３０）。金属陶瓷主要由球形ＴｉＣ颗粒和近乎网状的Ｎｉ粘结相组成。ＴｉＣ颗粒与粘结相界面结合良好,部分粘结相中残留有微量的游离碳。ＴＮ３０的抗弯强度和抗压强度分别达到９１０ＭＰａ和３．０４ＧＰａ。     

盐类反应制备TiB2／Al—4.5Cu复合材料的研究

采用Ｋ２ＴｉＦ６和ＫＢＦ４混合盐反应法制备ＴｉＢ２／Ａｌ－４．５Ｃｕ复合材料，通过ＳＥＭ，ＸＲＤ及ＭＴＳ等仪器研究了复合材料的凝固组织和力学性能。增强相ＴｉＢ２颗粒细小（＜２μｍ），呈近球形，均匀分布于基体之中，起强化和细化基体作用，ＴｉＢ２颗粒与基体结合好。当Ｋ２ＴｉＦ６和ＫＢＦ４混合物加入质量为基体的２０％时，复合材料的综合性能最好。ＵＴＳ达３５２ＭＰａ，ＥＬ达４．４％，ＨＢ达１４６。     

颗粒增强铝基复合材料的组织与性能

用熔铸法制备了ＴｉＢ２和ＳｉＣ颗粒增强铝基复合材料,评价了ＴｉＢ２／Ａｌ和ＳｉＣ／Ａｌ复合材料的硬度,研究了增强剂的加入方式和体积分数对ＴｉＢ２／Ａｌ复合材料拉伸性能的影响;并用扫描电镜分析了复合材料的显微组织。结果表明,ＴｉＢ２颗粒对Ａｌ基体的增强效果比ＳｉＣ颗粒好,Ｔｉ,Ｂ化合物的增强效果优于ＴｉＢ２粉末,复合材料的力学性能随ＴｉＢ２体积分数增加而提高;用含Ｔｉ,Ｂ化合物的混合物增强的１．５％ＴｉＢ２／Ａｌ（体积分数）复合材料的热轧退火态性能为σｂ１６０．４ＭＰａ,δ１３．１％,铸态ＨＢ４５１ＭＰａ。ＳＥＭ观察结果表明,在铝基体中添加Ｔｉ、Ｂ化合物的混合物能在基体中原位生成ＴｉＢ２颗粒。     

Fe含量对自蔓延高温合成TiC—Al2O3—Fe复合材料的影响

采用ＳＨＳ／ＰＨＩＰ工艺制备了致密的ＴｉＣ－Ａｌ２Ｏ３－Ｆｅ复合材料。研究了Ｆｅ含量对燃烧温度、燃烧波速度、产物密实度及力学性能的影响。结果表明，燃烧波速度在一定Ｆｅ含量内出现一近似平台，密实度随Ｆｅ含量变化而变化，在Ｆｅ含量为１０％时，产物的密实度最高，为９９．４％；随着Ｆｅ含量的增加产物的抗率强度不断提高，Ｆｅ含量为１０％和３０％时，抗弯强度分别为７４０ＭＰａ和９７０ＭＰａ。     

TiAl／Al的连接及Ti／TiAl／Al系梯度材料的制备

在１４７３Ｋ,３０ＭＰａ,１ｈ的热压条件下烧结了Ｔｉ／Ｔｉ＋ＴｉＡｌ／ＴｉＡｌ粉体叠层材料。在烧结过程中,混合层Ｔｉ＋ＴｉＡｌ内部发生了剧烈的化学反应（Ｔｉ＋ＴｉＡｌ→ＡｌＴｉ２）,该反应波及到相邻的Ｔｉ层及ＴｉＡｌ层,因而形成耻物相组成渐变的精细梯度结构;Ｔｉ／Ｔｉ＋ＡｌＡｉ２／ＡｌＴｉ２／ＡｌＴｉ２／ＴｉＡｌ／ＴｉｏＡｌ。使用Ａ１７６Ｓｉ１０Ｚｎ１０Ｃｕ４（质量分数,％）合金钎料在８５３Ｋ,２     

喷射沉积Al5.5Cu/TiB_2自生复合材料的界面结构

运用ＴＥＭ 观察了铸态、喷射沉积态Ａｌ５ ．５Ｃｕ／ＴｉＢ２ 复合材料中ＴｉＢ２ 与基体的界面结构,发现在铸态时ＴｉＢ２ 与α（Ａｌ） 之间存在的位向关系为［０３３２］ ＴｉＢ２ ∥［１１０］ α（Ａｌ） ,（０１１１）ＴｉＢ２ ∥（００２） α（Ａｌ） , 而在沉积态时其位向关系为［０００１］ ＴｉＢ２ ∥［１１１］ α（Ａｌ） ,（１１２０）ＴｉＢ２ ∥（２２０）α（Ａｌ） 。力学性能测试结果表明： 喷射沉积后的Ａｌ５ ．５Ｃｕ／ＴｉＢ２ 自生复合材料的抗拉强度比铸态提高约５０ ＭＰａ , 延伸率则提高５００ ％ 左右,耐磨性能也有较大提高     

LSM法制备TiB2/Al-7Si复合材料的研究

研究了ＬＳＭ 法制备 ＴｉＢ２ 粒子增强ＡｌＳｉ７ 复合材料的物相组成;考察了ＴｉＢ２ 粒子对热处理组织与性能的影响。研究结果表明,按Ｋ２ＴｉＦ６ ＋ ２ＫＢＦ４＝ ＴｉＢ２ ＋ ４ＫＦ＋ ５Ｆ２ 反应式计算,在ｗ （ＴｉＢ２）为５％ 时,在复合材料中可以生成稳定且均匀分布的ＴｉＢ２ 粒子,未发现ＴｉＡｌ３ 等相。材料的杨氏模量由７２．３ ＧＰａ 提高至９６．８ ＧＰａ。ＴｉＢ２ 粒子对热处理组织与性能无明显影响     

HA/Ti composite for biomedical application by mechanical milling

In order to overcome the poor mechanical properties of HA and the low bioactivity of Ti,HA/Ti composites with various compositions were prepared by mechanical milling.The effects of milling condition and the composition on the microstructure,the density and the hardness of the composites were studied.The results show that during the ball milling process.Ti particles are refined and the homogeneity of the HA/Ti mixtures is improved;HA will partially decompose due to the existence of Ti and high sintering temperature.The microstructure of HA/Ti composites is highly dependent on the milling condition and the composition.In the microstructure.Ti phase connects to be a continuous network,and HA/Ti mixtures disperse in the network.The longer the milling time,the finer the network will be.The density of HA/T composites decreases with the content of HA increasing and the milling time prolonging,because HA deteriorates the sinterability of Ti.The hardness of HA/Ti composites increases firstly with the content of HA increasing,and then drops when the content of HA exceeds 30%.Addition of HA will strengthen the HA/T composite but will decrease the density of the composite,which accounts for the effect of HA on the hardness of the composites.     

阳极氧化-电化学沉积-水热合成法制备Ti/TiO2/HA

采用阳极氧化-电化学沉积-水热合成法制备Ti/TiO2/Ca10(PO4)6(OH)2生物陶瓷复合涂层.利用D/Max-rB型X射线衍射仪(XRD)分析涂层的组织结构,用Sirion200型扫描电镜(SEM)观察涂层的表面形貌.结果表明:钛合金(Ti-6Al-4V)板经以10%的硫酸为电解液和电压为120V条件下的阳极氧化,形成孔径大约为100～200nm的多孔氧化膜,再经电化学沉积,得到尺寸大小约200～400nm的针状CaHPO4,最后经盛有浓度为0.1mol/L的NaOH水溶液、温度为200℃的高压釜中水热合成10h,针状的CaHPO4(转变为片状的Ca10(PO4)6(OH)2.     

电泳沉积法制备HA/Ti0，复合涂层

羟基磷灰石是一种最有发展前途的生物材料之一.采用电泳沉积方法在钛合金基体上制备了HA/TiO2生物陶瓷涂层.将HA和TiO2粉体分散到正丁醇溶液中,再加入三乙醇胺,通过zeta电位确定了稳定的悬浮液中三乙醇胺和HA/TiO2的含量.研究了沉积电压和电泳时间对HA/TiO2涂层形貌和沉积量的影响.制得均匀致密涂层的适宜电压范围为250～350V.研究结果表明:由于电场强度随沉积时间改变,HA/TiO2沉积量随着沉积时间的增加表现出2段沉积速率不同的线性增长.     

粉末冶金法制备多孔Ti-HA生物复合材料的研究

以碳酸氢铵粉末为造孔剂,羟基磷灰石(HA)和Ti-6Al-4V粉末为原料,采用粉末冶金法制备多孔Ti-HA生物复合材料,并测定了其微观结构和力学性能。通过分析碳酸氢铵含量和成型压力对材料力学性能和孔隙率的影响,得到材料的抗压强度和孔隙率随成型压力的增加而分别增加和减少,随碳酸氢铵含量的增加则分别减少和增加。当碳酸氢铵含量为20wt%和30wt%时,材料的孔隙率分布在30%～50%,抗压强度高于20 MPa,孔径分布在100～500μm。     

Interface activation and surface characteristics of Ti/TiN/HA coated sintered stainless steels

Interface activation and surface characteristics of Ti/TiN/HA film coated sintered stainless steels (SSS) have been investigated by electrochemical and biocompatibility tests. HA (hydroxyapatite), Ti, and Ti/TiN film coatings were applied using electron-beam deposition method (EB-PVD). Ti, Ti/TiN, and Ti/TiN/HA film coated surfaces and layers were investigated by SEM and XPS. The coated films showed micro-columnar structure, and Ti/TiN/HA films were denser than Ti or HA-only film. The corrosion resistance of the HA coating was similar to that of Ti/TiN/HA film coating when Cu content reached 4 wt.%, but the corrosion resistance of the HA coating decreased when Cu content increased from 4 wt.% in 0.9% NaCl solution. Therefore, HA-only coating could ensure corrosion resistance when Cu content does not exceed 4 wt.%. The results of biocompatibility tests of SSS on dogs showed that bone formation and biocompatibility were favorable when Cu content did not exceed 4 wt.%. The biocompatibility with bone was generally favorable in Ti/TiN/HA film coating and HA-only coating, while bone formation was somewhat faster for the HA film coated surface than for the Ti/TiN/HA film coating. Also, good cell growth and osseointegration without toxicity were observed.     

Sol-gel derived HA/TiO2 double coatings on Ti scaffolds for orthopaedic applications

Hydroxyapatite/titania （HA/TiO2） double layers were coated onto Ti scaffolds throughout for orthopaedic applications by sol-gel method. Differential scanning calorimetry （DSC）, thermogravimetric analysis （TG） and X-ray diffractometry （XRD） were used for the characterisation of the phase transformations of the dried gels and coated surface structures. Scanning electron microscope （SEM） equipped with energy dispersive spectrometry （EDS） was used for the observation and evaluation of the morphology and phases of the surface layers and for the assessment of the in vitro tests. The in vitro assessments were performed by soaking the HA/TiO2 double coated samples into the simulated body fluid （SBF） for various periods. The TiO2 layer was coated by a dipping-coating method at a speed of 12 cm/min, followed by a heat treatment at 600 ℃ for 20 min. The HA layer was subsequently dipping-coated on the outer surface at the same speed and then heat-treated at difference temperatures. The results indicat that the HA phase begins to crystallize after a heat treatment at 560 ℃. The crystallinity increases obviously at 760 ℃. SEM observations find no delamination or crack at the interfaces of HA/TiO2 and TiO2/Ti. The HA/TiO2 coated Ti scaffolds displays excellent bone-like apatite forming ability when it is soaked into SBF. Ti scaffolds after HA/TiO2 double coatings can be anticipated as promising implant materials for orthopaedic applications     

电泳沉积HA／Ti复合涂层的结合强度和热稳定性

为了制备均匀致密、结合强度较高的电泳陶瓷涂层,用正丁醇作分散介质,在Ti基底上电泳沉积HA/Ti复合涂层。研究了Ti基底处理、烧结温度控制以及悬浮液配方等因素对涂层结合强度的影响。用扫描电镜(SEM)对热处理后涂层形貌和结构进行观察,采用红外光谱仪(FTIR)、X射线衍射仪(XRD)、差示扫描量热仪(DSC/TG)对涂层的组成和热稳定性进行了表征。结果表明:用H2O2/NH3·H2O处理Ti基底,700℃下烧结,Ti含量为44.6%的HA/Ti复合涂层结合强度可达到23.2MPa。     

Microstructure and properties of plasma-sprayed bio-coatings on a low-modulus titanium alloy from milled HA/Ti powders

New composite hydroxyapatite/titanium (HA/Ti) coatings were fabricated by plasma spraying on Ti–24Nb–4Zr–7.9Sn alloy from milled precursor powders. The microstructures, mechanical properties and apatite-induction abilities of the coatings were investigated, and the influences of the initial HA/Ti ratios on microstructure and properties were highlighted. XRD, SEM and TEM were used to analyze the microstructures of the coatings. The micro-hardness and elastic modulus were determined by indentation tests and the bond strength was determined by tensile tests. The apatite-induction ability of the coatings was evaluated in simulated body fluid (SBF) with ion concentrations similar to those of human blood plasma. The results showed that the microstructure, mechanical properties and apatite-induction ability were dependent on the HA/Ti ratios of the original powders. The mechanical properties increased, and the apatite-induction ability decreased with increasing Ti content. Various chemical reactions occurred during the preparation of the coatings, including the decomposition of HA, the reaction between HA and Ti and the oxidization of Ti, which resulted in the formation of new phases, such as CaTiO₃, Ca₃(PO₄)₂, TiP_x and titanium oxides in the different coatings. These new phases play an important role for the mechanical properties and the apatite-induction ability of the coatings.     

Preparation of Ti6Al4V/BG/HA graded coating by electrophoresis deposition in absolute alcohol medium

1　ＩＮＴＲＯＤＵＣＴＩＯＮＨｙｄｒｏｘｙａｐａｔｉｔｅ (ＨＡ ) ,ａｍａｊｏｒｉｎｏｒｇａｎｉｃｓａｌｔｃｏｍｐｏｓｉｔｉｏｎｉｎｈｕｍａｎｂｏｎｅ ,ｈａｓｅｘｃｅｌｌｅｎｔｂｉｏｃｏｍｐａｔ ｉｂｉｌｉｔｙ ,ｓｏｉｔｃａｎｃｏｍｂｉｎｅｗｉｔｈｂｏｎｅｔｉｓｓｕｅｗｅｌｌｉｎｃｈｅｍｉｃａｌｂｏｎｄａｆｔｅｒｉｔｉｓｉｍｐｌａｎｔｅｄｉｎｔｏｈｕｍａｎｂｏｄｙ[1,2 ] .Ｉｔｉｓａｇｏｏｄｂｏｎｅｆｉｌｌｅｒａｎｄｒｅｐｌａｃｅｍｅｎｔｍａ ｔｅｒｉａｌ;ｂｕｔｂｅｃａｕｓｅｏｆｉｔｓｂｒｉｔｔｌｅｎ…     

钛合金表面声电沉积/碱热处理法制备HA涂层研究

为了使钛合金(Ti-6Al-4V)具有生物活性,可在其表面施加生物活性羟基磷灰石(HA)涂层.对比了声电沉积法和碱热处理法实验结果,采用扫描电镜(SEM)、X射线衍射仪(XRD)、电子能谱(EDS)、傅立叶红外透射光谱(FTIR)以及划痕测试等进行了分析.结果表明,直接采用声电沉积法在钛合金表面制备的羟基磷灰石涂层,经热处理后存在龟裂剥落现象;通过碱热处理法,对钛合金基体表面进行预处理,然后,借助声电沉积法,在钛金属表面沉积了透钙磷石涂层,经热碱液处理转变成的羟基磷灰石涂层,涂层完整,未出现剥落.经进一步高温烧结处理,所制涂层仍呈片状形貌,其由部分含钠的羟基磷灰石组成,而且HA涂层破坏的临界载荷未烧结前的4.365 N提高至烧结后的8.175N.