Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1994-05-11
1995-07-18
Langel, Wayne
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106451, 423306, 423601, 501 94, 501102, 501108, 501123, C01B 2545, C01G 2802
Patent
active
054337780
ABSTRACT:
Compounds that satisfy the general formula A.sub.1-Y.sup.4+ A.sub.Y.sup.1+ A.sub.Y.sup.3+ V.sub.2-X E.sub.X O.sub.7 exhibit isotropic NTE behavior above a temperature of about 100.degree. C. Y is from about 0.0 to about 0.4, and more preferably is about 0.2. X is from about 0.6 to about 1.4, and is more preferably about 1. Particularly suitable NTE compounds have X about 1 and Y about 0. A.sup.4+ is selected from the group consisting of Hf, Zr, Zr.sub.a M.sub.b, Hf.sub.a M.sub.b and mixtures thereof wherein a plus b equals one and M is selected from the group consisting of Ti, Ce, Th, U, Mo, W, Pb, Sn, Ge and Si. More preferably, A.sup.4+ is selected from the group consisting of Hf and Zr. A.sup.1+ is selected from the group consisting of the alkali earth metals, A.sup.3+ is selected from the group consisting of the rare earth metals, and E is selected from the group consisting of P and As. The NTE materials may be incorporated into compositions such as epoxy and ceramic compositions.
REFERENCES:
patent: 3941715 (1976-03-01), Shidlovsky
patent: 4112194 (1978-09-01), Chenot et al.
patent: 4337173 (1982-06-01), Otake
patent: 4675302 (1987-06-01), Roy et al.
patent: 4801566 (1989-01-01), Limaye et al.
patent: 5102836 (1992-04-01), Brown et al.
patent: 5254510 (1993-10-01), Matsuhiro et al.
patent: 5322559 (1994-06-01), Sleight
Komarneni, "Hydrothermal Preparation of the Low-expansion NZP Family of Materials," Int. J. Tech. Ceram. 4:31-39 (1988).
Craig et al., "Zirconium Pyrovanadate Transitions," J. Am. Ceram. Soc. 55:532 (1972). (only 1 pg).
Yamai et al., "Low-Thermal-Expansion Polycrystalline Zirconyl Phosphate Ceramic," J. Am. Ceram. Soc. 68:273-278 (1985).
Harrison et al., "High-Temperature Zirconium Phosphates," J. Am. Ceram. Soc. 37:277-289 (1954).
Ota et al., "Thermal Expansion of ZrP.sub.2 O.sub.7 and Related Solid Solutions," Japan, J. Materials Science, 22:3762-3764 (1987).
Buchanan et al., "Properties of Hot-Pressed Zirconium Pyrovanadate Ceramics," J. Electrochem. Soc.: Solid-State Science And Technology, 1905-1910, Sep. 1983.
Limaya, "New Low Thermal Expansion Materials for High Use Temperatures," Materials and Processing Report 4:1-2 (1989).
Laud et al., "Subsolidus Relations in the System ZrO.sub.2 -ThO.sub.2 -P.sub.2 O.sub.5," J. Am. Ceram. Soc. 54:407-409 (1971).
Gillery et al., "Thermal Contraction of .beta.-Eucryptite (Li.sub.2 O.multidot.Al.sub.2 O.sub.3 .multidot.2SiO.sub.2) by X-Ray and Dilatometer Methods," J. Am. Ceram. Soc. 42:175-177 (1959).
Roy et al., "Very Low Thermal Expansion Coefficient Materials," Ann. Rev. Mater. Sci. 19:59-61 (1989).
Langel Wayne
The State of Oregon Acting By and Through the State Board of Hig
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