Low expansion feldspathic porcelain

Details Low expansion feldspathic porcelain Low expansion feldspathic porcelain

1997-10-30

1999-11-30

Koslow, C. Melissa

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 6, 106 3, 433218, 433220, 4332021, 4332011, 4332121, C03C 1010, A61C 13083

Patent

active

059942460

ABSTRACT:
A feldspathic porcelain composition is provided which comprises a continuous glassy matrix phase and a discontinuous, substantially uniformly dispersed cubic leucite crystalline phase, said composition possessing a fusion temperature of from about 800.degree. to about 1200.degree. C. Methods of making the feldspathic porcelain composition are also provided, said methods comprising the steps of forming an alkali aluminosilicate powder comprising SiO.sub.2, Al.sub.2 O.sub.3, K.sub.2 O and Na.sub.2 O and at least one metal salt of rubidium, cesium, calcium, strontium, barium or thallium; heating the powder to effect an exchange of alkali cations with metal cations derived from said metal salt to provide a feldspathic porcelain composition which comprises a continuous glassy matrix phase and a discontinuous crystalline phase comprising cubic leucite.

REFERENCES:
patent: 4550030 (1985-10-01), Ohi et al.
patent: 4604366 (1986-08-01), Kacicz et al.
patent: 4798536 (1989-01-01), Katz
patent: 5071801 (1991-12-01), Bedard et al.
patent: 5192722 (1993-03-01), Bedard et al.
patent: 5204077 (1993-04-01), Mori et al.
Palmer, David C. et al., Phase Transitions in Leucite: X-ray Diffraction Studies, 16 Phys. Chem. Minerals, 714-719 (1989). No month.
Mazzi, Fiorenzo, et al., The crystal structure of tetragonal leucite, 61 Amer. Mineralogist, 108-115 (1976). No month.
Taylor, D. & Henderson, C.M.B., The Thermal Expansion of the Leucite Group of Minerals, 53 Amer. Mineralogist, 1476-1489 (1968). No month.
Martin, R.F. & Lagache, M., Cell Edges and Infrared Spectra of Synthetic Leucites and Pollucites in the System KAlSi.sub.2 06--RbAlSi.sub.2 0.sub.6 --CsAlSi.sub.2 0.sub.6, 13 Can. Minerologist, 275-281 (1975). No month.
Martin, R.F. & Lagache, M., L'effet du remplacement du potassium par le rubidium sur les parametres de la maille de la sanidine et la leucite, 93 Bull. Soc. fr. Mineral. Cristallogr., 581-582 (1970). No month.
Prasad, A. & Vaidyanathan, T.K. Crystallization of Cubic Leucite by Composition Additives, Paper presented at 19th annual session, American Association for Dental Research (Mar. 9, 1990).
(Abstract)--Dendry, Isabelle. L. et al., Effect of Rubidium-Leucite on the Flexural Strength and Thermal Expansion of Leucite-Reinforced Porcelain, Dental Research Meeting, (Mar. 1996).
Dendry, Isabelle L. & Rosensteil, Stephen F., Phase Transformations in Feldspathic Dental Porcelains, 48 Bioceramics: Materials and Applications 149-156, (1995). No month.
Faust, George T., Phase Transition in Synthetic and Natural Leucite, 43 Schweiz..Mineral.Petrogr.Mitt., pp. 165-195 (1963). No month.
Hirao, Kazuyuki et al., Thermal Expansion and Structure of Leucite-type compounds, 80 J. Phys. Chem., 1612-1616 (1976). No month.
Kriven, Waltraud M., Possible Alternative Transformation Tougheners to Zirconia: Crystallographic Aspects, 71 J. Amer. Cer. Soc., 1021-30 Dec. 1988.
Gallagher, Sarah A. & McCarthy, G.J., High Temperature Thermal Stability of CsAlSiO.sub.4, and CsAlSi.sub.2 O.sub.6 17 Mat. Res. Bull., 89-94 (1982). No month.
Rouf, M.A. et al., Crystallization of Glasses in the Primary Plan Field of Leucite in the K.sub.2 0-Al.sub.2 0.sub.3 --Si0.sub.2 System, 77 Trans. J. Brit. Ceram. Soc. 36-39 (1978) No month.
Hermansson L. & Carlsson, R., On the Crystallization of the Glassy Phase in Whitewares, 77 Trans. J. Brit. Ceram. Soc. 32-35 (1978) No month.
Hahn, Christoph & Teuchert, K., Importance of the glass ceramic system K.sub.2 O-Al.sub.2 O.sub.3 -SiO.sub.2 in dental porcelain, 57 Ber. Dt. Keram. Ges. 208-214 (1980). No month.
Mackert, J. Rodway Jr., Effects of Thermally Induced Changes on Porcelain-Metal Compatibility, pp. 53-64. No month.
Prasad et al, "Crystallization of Cubic Leucite By Composition Additives", paper presented at 19th Session of Amer. Assoc. Dent. Res., Mar. 9, 1990.
Hahn et al, "Importance of the Glass Ceramic System K2O-Al2O3-SiO2 in Dental Porcelain", Ber. Dt. Ges. No. 9-10, pp. 208-214, 1980.

Affiliated with

Also associated with

Rating

Low expansion feldspathic porcelain does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low expansion feldspathic porcelain, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low expansion feldspathic porcelain will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1672158