超细TiO_2的新用途

介绍了超细二氧化钛相对于普通钛白粉所具有的一些特殊性能，并重点介绍了超细二氧化钛的新用途及其诱人的应用前景。     

用于防晒霜的二氧化钛等材料的光吸收测量

对几种用于防晒霜的二氧化钛材料和防晒霜成品进行了光吸收测量,结果表明,无论是纳米二氧化钛还是钛白粉,它们对紫外线的吸收效率都不如有机紫外线吸收剂好.     

新用途将推动全球钛白粉市场需求进一步趋紧

二氧化钛（或称钛白粉）广泛应用于各类结构表面涂料、纸张涂层和填料、塑料及弹性体，其它用途还包括陶瓷、玻璃、催化剂、涂布织物、印刷油墨和焊剂。分析显示，全球二氧化钛市场需求将进一步趋紧，同时由于生产成本不断上涨，生产厂商盈利受到严重挤压，造成厂商不断提价。     

掺铁二氧化钛纳米线的合成及其光催化性能

首次以钛酸丁酯、异丙醇等有机物为原料,在10M NaOH溶液中水解后,于180℃水热24h,一步法合成二氧化钛纳米线(TNWs),并用扫描电子显微镜(SEM)和X射线衍射(XRD)等手段表征其形貌和结构。结果表明,所得TNWs焙烧到950℃时,仍为锐钛矿相,表明本制备方法迟滞了二氧化钛由锐钛矿相到金红石相的转变。此外,以甲基橙为目标降解物,在300 W汞灯照射下,研究了不同水热温度、保温时间及掺杂量对掺铁二氧化钛纳米线(Fe-TNWs)光催化性能的影响。结果表明,于750℃焙烧4h制备的掺铁摩尔百分数为0.5%的TNWs,具有最强的光催化降解性能,其降解速率和效率较未掺杂的样品都有了大幅度的提高。     

水热温度对二氧化钛结构及光催化活性的影响

以四氯化钛、环氧丙烷和乙醇为原料,采用水热法在不同温度下分别合成了金红石相纳米二氧化钛及板钛矿相与金红石相混晶结构的纳米二氧化钛,并利用X射线衍射(XRD)、透射电镜(TEM)和N2吸附-脱附对其进行了表征。以甲基橙为探针研究了不同水热温度对二氧化钛光催化活性的影响。     

高钛渣——我国酸法钛白清洁生产的基础原料

<正>一、酸法钛白粉生产的简述硫酸法钛白粉(二氧化钛〔TiO2〕)生产是世界上历史最为悠久的传统方法。我国的钛白工业是从硫酸法起步的,所以目前该法仍然是我国生产钛白粉的主要方法。虽然盐酸法生产钛白粉有着许多独特的优点,但是这种     

压滤机在硫酸法钛白粉生产的应用

钛白粉是一种优质的白色颜料,具有良好的光散射能力,因而白度好,着色力高,遮盖力强。白度是钛白粉最重要的质量指标之一。影响钛白粉白度的因素是复杂的,杂质的含量是影响钛白粉的白度主要因素之一。因此,为了提高钛白粉的白度,在生产过程中应尽可能除去杂质含量。钛液中的不溶性杂质可在沉降和精滤过程中除去,通过结晶,可以除去溶液中大部分的硫酸亚铁,在偏钛酸水洗过程中,将溶解于溶液的硫酸亚铁等杂质除去。应用过滤设备对不同工段的二氧化钛进行过滤和水洗,实现二氧化钛同其它杂质的分离,过滤设备的正确选用有着至关重要的作用,既要最大限度减少废物的排放量,又不使产品的质量下降。     

有序介孔二氧化钛粉体研究进展

主要综述了高度有序六方相和立方相孔道结构介孔二氧化钛以及具有低有序蠕虫状孔道结构介孔二氧化钛的制备方法及其结构特征。总结了后处理法、模板剂脱除法在制备稳定、具有有序介孔和锐钛矿相孔壁的介孔二氧化钛粉体中的应用,指出采用直接合成法制备孔壁结晶的介孔二氧化钛原粉,之后用萃取法脱除模板剂并用钛酸异丙酯蒸气增强骨架,将是得到高稳定性有序介孔二氧化钛材料的良好途径。     

MWCNT/TiO2复合材料光催化活性研究

以多壁碳纳米管(MWCNT)为基核,以钛酸丁酯为前驱体,分别用溶胶-凝胶法和水热法制备碳纳米管/二氧化钛纳米复合光催化材料.用X射线衍射仪(XRD)、透射电子显微镜(TEM)对样品进行了表征,研究了溶胶-凝胶法和水热法工艺的控制对碳纳米管/二氧化钛复合光催化剂显微组织及性能的影响.以甲基橙为目标降解物,考察了样品的自然光催化活性.结果表明,所得复合粉体中仅有碳纳米管和锐钛型二氧化钛两种物相,其中采用水热法所得样品,其纳米级的球形二氧化钛颗粒可均匀吸附在碳纳米管表面.     

TiO2/CdS复合光催化剂的制备及结构研究

以钛酸四丁脂为原料、乙醇为溶剂、醋酸为水解抑制剂,采用溶胶-凝胶法制备CdS纳米颗粒改性TiO2光催化剂凝胶.系统地研究了干凝胶的热行为,在不同热处理温度下二氧化钛的晶体结构和二氧化钛热处理温度与晶粒度之间的关系.研究表明,670℃/3h焙烧后,TiO2由锐钛矿结构全部转变为金红石结构;当CdS的掺入量大于6%(mol)时,670℃/3h焙烧后,有CdTiO3新物相生成;CdS的掺入抑制了锐钛矿TiO2晶粒的长大和锐钛矿结构向金红石结构的转变.     

Development of TiB and nanocrystalline Ti-reinforced novel hybrid Ti nanocomposite produced by powder metallurgy

Journal of Materials Science - Titanium monoboride (TiB) whisker-reinforced titanium (Ti) matrix composites were produced by powder metallurgy, through vacuum sintering. TiB is formed by thermal...     

Preparation of titanium nitride coated powders by rotary powder bed chemical vapour deposition

Titanium nitride coated powders were prepared by rotary powder bed chemical vapour deposition (CVD) in which a powder in a rotary specimen cell was heated by infrared radiation in a reactant gas stream. Titanium powder covered with TiN or Ti₂N thin film was obtained by diffusion coating treatment of titanium particles (grain size 10 to 50 µm) at 900 to 1000°C and 0.5 to 1.0 atm for 60 min in a nitrogen stream. TiN was coated on to the surface of scaly graphite particles (grain size 30 to 100 µm or 100 to 1000 µm) as well as titanium particles by CVD in the reactant system TiCl₄-N₂-H₂ at 900° C and 1 atm for 40 min. The uniformity of the coating (composition and film thickness) and the dispersability of the coated particles were considerably promoted by rotating the powder bed at about 90 r.p.m. compared with nonrotary powder bed CVD.     

低成本钛及钛合金铸件生产方法的研究

本文以石墨粉为耐火材料，采用砂型铸造造型工艺造型，用真空凝壳炉熔炼浇注，成功生产出了钛及钛合金铸件。该工艺与传统机加石墨型铸造方法相比成本大幅降低，所生产铸件力学性能、化学成分均能达到标准要求。     

Dental magnesia-based investments for cast titanium crown: setting and fitness

Titanium crowns were cast using experimental magnesia-based investment mixed with hydrolysed sol. Ten types of hydrolysed sol were used, adding a catalyst to each sol whether the setting (hardening) of the magnesia investment powder appeared within 3 h after mixing. A penetration test using a Vicat needle to measure needle depth as setting was carried out after mixing of the investment powder, showed that the penetration depth decreased gradually with increasing holding time at room temperature. Setting time was shown to be more or less than 3 h or dependent on the gelation. The total magnitude of expansion (setting + thermal) ranged from 0.5 to 0.9% using the selected mixtures. Titanium cast crowns were made in the range 0.02–1.3 mm (occlusal) and 0.03–1.5 mm (cervical), depending on the expansion value of the particular magnesia-based investments mixed with the hydrolysed sols.     

高压氮气中自蔓延燃烧合成氮化钛

利用钛粉在高压氮气中的自蔓延燃烧合成（ＳＨＳ），制备了含氮量较高的ＴｉＮ，研究了反应物的松装密度、氮气压的改变与稀释剂的加入对燃烧波蔓延速率和产物转化率的影响，还观察到燃烧方式的改变。     

钛粉末冶金研究进展(英文)

从第12届世界钛会可以看出,传统钛粉末冶金即冷压烧结在降低钛制品的制造成本和改进烧结钛制品的成分及显微组织方面已有了许多可喜的进展。结合第12届世界钛会有关钛粉末冶金方面的研究报告,主要从钛粉体烧结过程中氧和残留氯化物的去除和控制、使用氢化钛粉的优点、通过控制氢化钛粉烧结过程相变制备出具有超细(亚微米至几个微米)显微组织特征的高性能钛材料、合金元素含量高钛合金的烧结特点、微波辐射烧结钛及钛合金几个方面讨论了钛粉末冶金相关研究的最新进展。     

混合元素法PM钛合金的研究进展

混合元素法PM钛合金在汽车工业中具有广阔的应用前景，以显微组织及力学性能为基准，综述了混合元素法Ti-6Al-4V合金的研究进展，提出了今后研究走向的几点思考。     

Laser heat treatment of titanium GRADE 1 with iron‐nickel powder

Titanium alloys thanks to their low density and high mechanical properties are a group of materials that are being used willingly nowadays. A promising method of titanium heat treatment is laser alloying. Process parameters like laser beam power, its traverse speed, amount of alloying elements and shield gas, have influence on the resulting material. Different chemical composition and morphology can be achieved resulting in a change of properties on the surface of the material. The paper presents the investigation of titanium GRADE 1 processed with iron‐nickel powder using laser alloying. The treatment was performed using a high power diode laser. Different laser beam power values were used. Treatment resulted in obtaining good‐adhere, porous‐free, uniform composite material with no cracks. Formation of new phases and solid solution was the reason why it was possible to achieve an increase in microhardness on the surface. Light microscopy, scanning electron microscopy with energy dispersive X‐ray spectroscopy examination, microhardness results and X‐ray diffraction are presented within the paper.     

Effects of addition of TiN nanoparticles on microstructure and mechanical properties of TiC based cermets

Abstract

Titanium carbide based cermets with additions of titanium nitride nanoparticles were fabricated by using ultrasonic dispersion and conventional powder metallurgy techniques. In order to characterise the microstructure, SEM and TEM have been utilised. The results show that the microstructure becomes finer with increasing additions of titanium nitride nanoparticles. The mechanical properties were also measured and the results show that the properties do not change monotonously with the amount of titanium nitride nanoparticle addition. Good properties can be obtained when the amount of TiN addition reaches 6 - 8 wt-%. The improvement of properties is mainly owing to the refinement of TiC grains as well as the deflection effect of titanium nitride nanoparticles on crack propagation.     

Laser-induced breakdown spectra in the infrared region from 750 to 2000 nm using a cooled InGaAs diode array detector

Emissions from a laser-induced breakdown spectroscopy (LIBS) plasma were examined in the region from 750 nm to 2000 nm. A Nd:YAG laser at 532 nm and 75 mJ per pulse were used to initiate the plasma. The detector was an InGaAs 1024 element diode array cooled to -100 degrees C. An f/4 spectrometer with gratings blazed for this region was used as the dispersive element. Survey spectra of soils, uranium, and other selected samples were taken in air and in a flow cell purged with argon at a local pressure of 0.84 x 10(5) Pa. Strong infrared lines of neutral aluminum, carbon, potassium, silicon, sulfur, and uranium, as well as once ionized lines of calcium, were observed out to 1670 nm. For potassium, the detection limits of the infrared (IR) system were compared with those obtained from a standard intensified charge-coupled device (ICCD) spectrometer arrangement, using the 766-770 nm doublet. Detection limits with the IR system were twice as high as those obtained from the ICCD detector.