Negative thermal expansion material

Details Negative thermal expansion material Negative thermal expansion material

1993-05-11

1994-06-21

Langel, Wayne

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106451, 423306, 501 94, 501102, 501108, 501123, C01B 2545

Patent

active

053225597

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 P.sub.X O.sub.7 exhibit isotropic NTE behavior in the range of normal ambient temperatures. 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, Pt, 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, and A.sup.3+ is selected from the group consisting of the rare earth metals. Such NTE materials exhibit isotropic negative linear expansion at a temperature below about 100.degree. C. The NTE materials also 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.
Komarneni, "Hydrothermal Preparation of the Low-expansion NZP Family of Materials," Int. J. High Tech. Ceram. 4:31-39 (1988).
Craig et al., "Zirconium Pyrovanadate Transitions," J. Am. Ceram. Soc. 55:532 (1972). (Only 1 page).
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).

Affiliated with

Also associated with

Rating

Negative thermal expansion material does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2218459