The effect of silica-containing binders on the titanium/face coat reaction

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Description

The interactions of CP-Ti and Ti-6Al-4V with investment molds containing alumina/silica and yttria/silica face coat systems were studied. Containerless melting in a vacuum was employed and small test samples were made by drop casting into the molds. The effects of the face coat material and mold preheat temperatures on the thickness of the alpha case on the castings were evaluated with microhardness and microprobe measurements. It was found that the thickness of the alpha case was the same, whether a yttria/silica or alumina/silica face coat was used, indicating that the silica binder reacted with the titanium. Hence, the use of ... continued below

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20 p.

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Frueh, C.; Poirier, D. R. & Maguire, M. C. November 1996.

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  • Frueh, C.
  • Poirier, D. R. Univ. of Arizona, Tucson, AZ (United States). Dept. of Materials Science and Engineering
  • Maguire, M. C. Sandia National Labs., Albuquerque, NM (United States). Liquid Metal Processing Lab.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The interactions of CP-Ti and Ti-6Al-4V with investment molds containing alumina/silica and yttria/silica face coat systems were studied. Containerless melting in a vacuum was employed and small test samples were made by drop casting into the molds. The effects of the face coat material and mold preheat temperatures on the thickness of the alpha case on the castings were evaluated with microhardness and microprobe measurements. It was found that the thickness of the alpha case was the same, whether a yttria/silica or alumina/silica face coat was used, indicating that the silica binder reacted with the titanium. Hence, the use of expensive refractories, such as yttria, represents an unnecessary cost when combined with a silica binder. It was also found that the alloyed titanium castings had a thinner alpha case than those produced from CP-Ti, which suggests that the thickness of the alpha case depends on the crystal structure of the alloy during cooling from high temperatures. Furthermore, castings made in small yttria crucibles used as molds exhibited little or no alpha case.

Physical Description

20 p.

Notes

OSTI as DE97001471

Source

  • Other Information: PBD: Nov 1996

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  • Other: DE97001471
  • Report No.: SAND--96-2712
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/414395 | External Link
  • Office of Scientific & Technical Information Report Number: 414395
  • Archival Resource Key: ark:/67531/metadc674497

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Creation Date

  • November 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

Description Last Updated

  • April 13, 2016, 1:37 p.m.

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Frueh, C.; Poirier, D. R. & Maguire, M. C. The effect of silica-containing binders on the titanium/face coat reaction, report, November 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc674497/: accessed November 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.