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研究了真空蒸馏法分离铟锡合金,回收金属铟与锡的新工艺。从理论上分析了铟与锡分离的可能性和规律性,并进行工业化试验。工业化试验的结果表明,控制蒸馏温度1050℃,真空度3 Pa时,铟锡合金中的铟与锡能在较大程度上分离开,得到含铟量大于95%的粗铟,粗铟中的含锡量降至1%以下。铟的直收率达到92%,物料的总回收率达到99%。该方法是铟锡分离中流程短、无污染、低能耗的新工艺、新技术。 相似文献
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采用真空电阻炉对铟锡合金进行了实验研究。首先通过实验确定了较好的蒸馏时间和蒸馏温度范围。最后根据化验结果确定了对生产具有指导意义的实验条件,即对金属铟质量分数为90%的铟锡合金进行真空蒸馏时,采取的对生产具有指导意义的工艺条件为蒸馏温度1250℃,蒸馏时间60 min;蒸馏温度1300℃,蒸馏时间40 min;所得的金属铟的含铟量大于99%。 相似文献
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铟锡氧化物薄膜的生产现状与应用 总被引:1,自引:0,他引:1
刘世友 《材料科学与工程学报》1999,(2)
介绍了铟锡氧化物(ITO)薄膜的特征,主要生产工艺及其在汽车、宇航、建筑、电子、太阳能等领域的应用。并对该材料生产工艺及产品市场的发展前景进行了展望 相似文献
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Serguei Tikhov Vladimir Usoltsev Aleksey Salanov Sergey Tsybulya Yurii Chesalov Galina Kustova Vladislav Sadykov Galina Golubkova Oleg Lomovskii 《Journal of Materials Science》2010,45(12):3160-3168
The microstructure of the porous Cr–Al metal–oxide cermet was studied by means of XRD, SEM, EDX as well as IR and Raman spectroscopy.
This cermet was synthesized by mechanical alloying of Cr–Al powders in an AGO-2 planetary ball mill followed by hydrothermal
treatment in a special stainless steel die and calcination in air. As a result, a highly porous monolith comprised of metal-like
particles randomly distributed in the oxide matrix (Cr2O3 and Al2O3) was formed. Two types of the composite cores were found in cermets. The first one consisted of chromium phase containing
nanoparticles sized from 50 to 140 nm and Al-enriched phase at the interfaces. The second one consisted of new chromium oxide
phases with hexagonal Cr2N-like and fcc CrN-like structures probably with Cr2O and CrO stoichiometry. These new phases were stabilized within aggregates of the nanocomposite particles containing inclusions
of alumina. The relations between different preparation stages and the cermet microstructure are discussed. 相似文献
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A. Ph. Ilyuschenko V. A. Okovity A. I. Shevtsov N. G. Kashin A. I. Kulak 《Materials and Manufacturing Processes》2002,17(2):177-185
Powder synthesis on the basis of a matrix from nanocrystalline titanium dioxide with incorporated HA particles was developed. Using scanning and transmission electron microscopy (SEM and TEM), the shape, size, and relief of TiO2-HA powder particles are investigated. When calculating for the powder particles using the SEM photos and TEM negative films on a picture analyzer, the granulometrical composition and the average maximum particle diameter (0.7 μm) are determined. 相似文献
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Preparation of nickel-coated alumina composite powder by an aqueous-phase reduction process 总被引:3,自引:0,他引:3
A nickel coating on the surface of alumina particles, used as a reinforcement in metal-ceramic composite materials, substantially improves their wettability by molten metals. Nickel was deposited on alumina particles by reducing nickel ions from a solution under hydrogen pressure in the presence of ammonia as a complexing agent. It was found that the addition of Fe2+ ions and anthraquinone was necessary for forming an adequate nickel coating on the alumina surface. The optimum conditions were the [NH3]/[Ni2+] ratio of 1.6, 2760 kPa hydrogen pressure, 175 °C, and an anthraquinone addition of 0.04 g l–1. 相似文献
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制备了导电聚苯胺/纳米镍粉复合屏蔽材料.实验中把导电聚苯胺与镍粉以28的比例制成复合粉,然后再将复合粉与环氧树脂以37的比例混合,制成屏蔽涂料.检测结果显示,当聚苯胺电导率为102S/cm、镍粉颗粒尺寸为50~180nm、涂层厚度为0.45mm时,在30~1500MHz的频段范围可获得80~100dB的屏蔽效能.分析表明,大幅度提高吸收损耗,适当降低反射损耗可以减少二次电磁污染.这种屏蔽涂料不仅可用于电器机壳,而且也可用于电子元件、器件. 相似文献
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以偏钨酸铵(AMT)、可溶性钴盐、有机碳源为原材料,采用喷雾转化、直接碳化原位合成法,成功制备出WC-Co复合粉末。利用XRD、SEM等分析方法对粉末样品物相组成、微观形貌、粒度分布进行了研究。研究表明,由于Co对W碳化的促进作用,在900℃时,W就被完全碳化为WC,远低于W正常被碳化完全的温度;W的碳化过程主要依靠钨粉颗粒表面与含碳气氛热解后沉积在钨颗粒表面上的碳元素的反应以及碳向钨粉颗粒内部的扩散来实现,属固-固反应;由于生成W2C的自由能比WC的更低,W很快先被碳化为W2C,然后再进一步碳化为WC;W/Co/C碳化反应体系沿WCo3,Co6W6C,W2C-Co,WC-Co步骤进行反应;随着温度的升高,反应体系可不经过前两步,而直接生成W2C-Co,再进一步碳化为WC-Co复合粉。 相似文献
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Synthesis of Al2O3-WC composite powder by SHS process 总被引:2,自引:0,他引:2
J. Zhang J. H. Lee C. W. Won S. S. Cho B. S. Chun 《Journal of Materials Science》1999,34(21):5211-5214
Al2O3-WC composite powder was synthesized by self-propagating high-temperature synthesis using Al powder as a reducing agent. WC, W2C and Al2O3 were concurrently formed in WO3-Al-C system. It was found that the complete reaction was achieved with excessive addition of carbon and appropriate processing parameters such as degree of dilution, particle size of aluminum, pellet compaction pressure and carbon source. The final product which was leached by 50% 1 : 4 HNO3 + HF diluted solution was consisted of Al2O3-55wt%WC having 2–3 m of mean particle size. 相似文献
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Investigation of functional core-rim composite part production by inserted powder injection moulding
Mehmet Subaşi Harun Koçak Asghar Safarian Çetin Karataş 《Materials Science & Technology》2020,36(3):293-298
In this study, the use of Cu and Ni interlayers have been investigated for functional core-rim composite part production with WC-Co 9?wt-% feedstock/steel. For this purpose, different experiments have been performed and joining condition, shear strength and microstructure of the intermediate region have been examined. It has been found that AISI 4340 insert/WC-Co have been joined and 85.8?MPa shear strength achieved, but high speed steel insert has not joined. Moreover, it has been determined that better results are obtained with Ni interlayer. Under the same conditions, when the 40?µm Ni interlayer has been used between AISI 4340 core and WC-Co rim, shear strength has been increased approximately twice and has been 162.7?MPa. 相似文献
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《Advanced Powder Technology》2020,31(5):1940-1945
In this study, high-purity and ultrafine WC-6%Co composite crystallites was synthesized by a simple two-step process consisting of the precursor-formation of the mixture of blue tungsten oxide (WO2.9) and cobaltic oxide (Co2O3) and the following deep reduction and carburization with CH4-H2 mixed gases. The experimental results revealed that after the first carbothermic reduction stage at 1050 or 1150 °C, a mixture of W, WO2 and Co7W6 was obtained, which was further carburized to the WC and Co phases by CH4-H2 mixed gases at 900 °C. With the increase of C/WO2.9 molar ratio, the particle sizes of first-stage precursor and carbonized product were both decreased. The particle sizes of final products are mainly determined by C/WO2.9 ratio and reaction temperature at the first stage. When the C/WO2.9 ratio was in the range of 2.3–2.7, the high-purity WC-6%Co composite powder with the average particle sizes of 160–410 nm could be obtained. 相似文献