Статья
  • формат pdf
  • размер 165.23 КБ
  • добавлен 16 июня 2011 г.
Koc r., Hodge d.B. Production of TiB2 from a precursor containing carbon coated TiO2 and B4c
Статья. Опубликована в "Joual of materials science letters" 19 (2000)667–669, Издательство Kluwer Academic Publishers, 2000 г.
Abstract. The synthesis of titanium diboride (TiB2) by reduction of carbon-coated titania (TiO2) mixed with boron carbide (B4C) was investigated. Degussa P-25 TiO2 with a
surface area of about 50 m2/g powder and a 70/30% anatase to rutile phase, B4C with a surface area of about 18 m2/g were used as starting powders. TiO2 was coated with C by decomposing propylene (C3H6) and allowing the C to adhere to the surface of the TiO
2. This carbon coated TiO2 was then mechanically mixed with the B4C. This mixture was reacted at 1400C in ?owing argon atmosphere for the production of TiB
2. X-ray diffraction (XRD), free oxygen and carbon, BET surface area analysis, and transmission electron microscopy (TEM)were used to characterize the produced TiB2 powders. The use of the C-coated precursor resulted in TiB2 with a BET surface area of 7.3 m2/g, submicron particle size (0.7–0.9 mcm), and oxygen content of 1.66 wt% when reacted at 1400C for 2h in ?owing argon gas.
Похожие разделы
Смотрите также

Angelo J.A., Jr. Solid matter

  • формат pdf
  • размер 5.99 МБ
  • добавлен 19 августа 2011 г.
Facts On File Inc., New York, 2011, 212p. Solid Matter: An Initial Perspective Physical Behavior of Matter The Gravity of Matter Fundamentals of Materials Science Rocks and Minerals Metals Building Materials Carbon—Earth’s Most Versatile Element Sand, Silicon, and Ceramics Polymers, Soft Matter, and Composites

Axelbaum R.L., Dufaux D.P., Frey Cc.A., Sastry S.M.L. A flame Process for Synthesis of Unagglomerated, Low-Oxygen Nanoparticles: Application to Ti and TiB2

Статья
  • формат pdf
  • размер 795.17 КБ
  • добавлен 16 июня 2011 г.
Статья. Опубликована в METALLURGICAL AND MATERIALS TRANSACTIONS B, VOLUME 28B, DECEMBER 1997—1199 Abstract. A gas-phase ?ame process for synthesizing unagglomerated nanoparticles of metals, intermetallics, ceramics, and composites is described. Employing this process, titanium and titanium boride have been synthesized by the vapor-phase reaction of sodium with titanium tetrachloride and a 1:2 mixture of titanium tetrachloride and boron trichlorid...

Bidan G., Bernier P., Lefrant S. Advances in Synthetic Metals: Twenty years of progress in science and technology

  • формат pdf
  • размер 20.09 МБ
  • добавлен 25 сентября 2011 г.
Elsеvier Sciеnce, 1999, 458 pages This edited work contains eight extensive, review-type contributions by leading scientists in the field of synthetic metals. The authors were invited by the organisers of the International Conference on Science and Technology of Synthetic Metals '98 (ICSM'98) to review the progress of research in the past two decades in a unifying and pedagogical manner. The present work highlights the state-of-the-art of the f...

Donnet C., Erdemir A. (Eds.) Tribology of Diamond-like Carbon Films: Fundamentals and Applications

  • формат pdf
  • размер 21.83 МБ
  • добавлен 30 августа 2011 г.
Springer Science + Business Media, LLC, New York, 2008, 664 pages Since their initial discovery, Diamond Like Carbon films have enjoyed an overwhelming interest from both the scientific and industrial community. This book highlights some of the most important structural, chemical, mechanical and tribological characteristics of DLC films. It is particularly dedicated to the fundamental tribological issues that impact the performance and durability...

Krishnarao R.V., Subrahmanyam J. Studies on the formation of TiB2 through carbothermal reduction of TiO2 and B2O3

Статья
  • формат pdf
  • размер 598.93 КБ
  • добавлен 16 июня 2011 г.
Статья. Опубликована в Materials Science and Engineering A362 (2003) 145–151, Издательство Elsevier B.V. , 2003 г. Abstract Formation of titanium di-boride (TiB2) whiskers through carbothermal reduction of TiO2 and B2O3 has been studied from 900 to 1600 C in 1 atm argon. K2CO3, which forms a low melting liquid by reacting with TiO2, and NiCl2, which catalyses the carbon gasi?cation, were used to aid the whisker formation by a vapor–liquid–solid (...

Kurz W., Fisher D.J. Fundamentals of Solidification

  • формат pdf
  • размер 32.34 МБ
  • добавлен 09 ноября 2011 г.
Trans. Tech. Publication, 4th edition, 1992, 305 pages This updated edition presents a picture of the majority of solidification phenomena which control the formation of microstructures. Solidification phenomena play an important role in many processes used in a wide range of fields, from production engineering to solid-state physics. Simple models have been developed to attempt to aid understanding of this complex subject. In this text there...

Nastasi M., Mayer J.W, Hirvonen J.K. Ion-solid interactions: fundamentals and applications

  • формат djv
  • размер 5.53 МБ
  • добавлен 03 июня 2011 г.
Cambridge University Press, 2004 - 540 pages Annotation: Modern technology depends on materials with precisely controlled properties. Ion beams are an excellent way to achieve controlled modification of surface and near-surface regions. In every integrated circuit production line, for example, there are ion implantation systems. In addition to integrated circuit technology, ion beams can modify the mechanical, tribological, and chemical propertie...

Schaaf P. Laser nitriding of metals

Статья
  • формат pdf
  • размер 3.13 МБ
  • добавлен 07 июня 2011 г.
Article. Progress in Materials Science 47 (2002) 1-161 Abstract: Laser nitriding can be described as the irradiation of metal surfaces by short laser pulses in nitrogen containing atmospheres. This may lead to a strong take-up of nitrogen into the metal and nitride formation which can improve the metal's surface properties, e.g. the hardness or the corrosion and wear resistance. Here, the laser nitriding of iron, carbon steel, stainless steel, an...

Sopicka-Lizer M. (Ed.) High-Energy Ball Milling: Mechanochemical processing of nanopowders

  • формат pdf
  • размер 46.72 МБ
  • добавлен 24 декабря 2011 г.
Woodhead Publishing Limited, 2010, 422 pages Mechanochemical processing is a novel and cost effective method of producing a wide range of nanopowders. It involves the use of a high energy ball mill to initiate chemical reactions and structural changes. High energy ball milling: Mechanochemical processing of nanopowders reviews the latest techniques in mechanochemistry and how they can be applied to the synthesis and processing of various high-t...

Welham Nicholas J. Formation of Nanometric TiB2 from TiO2

Статья
  • формат pdf
  • размер 212.22 КБ
  • добавлен 16 июня 2011 г.
Статья. Опубликована в Journal of the American Ceramic Society, Vol. 83, No. 5, 2000 Abstract. Titanium diboride can be produced by ball-milling a mixture of TiO2, B2O3, and Mg metal for between 10 and 15 h. The reaction was found to be completed during the milling with no evidence of residual Mg. The unwanted phase, MgO, was readily removed by leaching in acid. The leached powder obtained after 15 h milling had a particle size of 200 nm and was...