TY - JOUR
T1 - The effect of silica-containing binders on the titanium/face coat reaction
AU - Frueh, C.
AU - Poirier, D. R.
AU - Maguire, M. C.
N1 - Funding Information:
This work was supported by the United States Department of Energy under Contract No. DE-AC04-94AL85000. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy. One of the authors (CF) appreciates the support of an Associate Western Universities–Department of Energy Fellowship. Discussions with A. Yasrebi, Precision Castparts Corp. (Portland, OR), D. Mus-toe, Custom Technical Ceramics (Arvada, CO); L. Gon-nsen, Sandia National Laboratories (Albuquerque, NM); B.A. Mueller, Howmet (Whitehall, MI); and W.D. Boettin-ger, NIST (Gaithersburg, MD) are greatly appreciated. The assistance of M. Cromwell, E. Romero, and P. Sung in preparing the manuscript and some of the figures is also appreciated.
PY - 1997
Y1 - 1997
N2 - 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 argon 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 in the drop 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 can reduce the apparent inertness of a more stable refractory, such as yttria. 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, the small drop castings made in small yttria crucibles used as molds exhibited little or no alpha case.
AB - 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 argon 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 in the drop 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 can reduce the apparent inertness of a more stable refractory, such as yttria. 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, the small drop castings made in small yttria crucibles used as molds exhibited little or no alpha case.
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U2 - 10.1007/s11663-997-0019-1
DO - 10.1007/s11663-997-0019-1
M3 - Article
AN - SCOPUS:0031246689
VL - 28
SP - 919
EP - 926
JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
SN - 1073-5615
IS - 5
ER -