EP0306242A2
Expired / Lapsed
EP
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Heat-resistant materials and method of producing them
Assignee: NGK Insulators Ltd
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Filing: 1988-08-26
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Granted: —
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Expires: 2008-08-26
Abstract
Abstract A novel solid solution has a composition of R y Zr₄Si x P 6-x O₂₄ (R is at least one element capable of forming bivalent or trivalent cation, 0≦x≦2, 2/3≦y≦2). Furthermore, heat-resistant sintered body and heat-resistant phosphate based compound sintered body comprises the above solid solution and has excellent heat resistance and high temperature stability. And also, a method of producing such sintered bodies is disclosed.
Inventors
- 👤 Keiichiro 4E Coop. Nakanomachi House Watanabe
- 👤 Tsuneaki Ngk Takemi-Ryo Ohashi
- 👤 Tadaaki Matsuhisa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 15:12
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/481
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
56 words
A solid solution having a composition of R y Zr₄Si x P 6-x O₂₄, wherein R is at least one element capable of forming bivalent or trivalent cation, x is a numerical value of 0 to 2, and y is a numerical value of 2/3 to 2 satisfying an electrically neutral condition of the chemical formula.
Claim 2
Dependent Claim
56 words
A solid solution having a composition of R y Zr₄Si x P 6-x O₂₄, wherein R is at least one element capable of forming bivalent or trivalent cation, x is a numerical value of 0 to 2, and y is a numerical value of 2/3 to 2 satisfying an electrically neutral condition of the chemical formula.
Claim 3
Dependent Claim
59 words
A heat-resistant sintered body comprising a solid solution of R y Zr₄Si x P 6-x O₂₄ system, wherein R is at least one element capable of forming bivalent or trivalent cation, x is a numerical value of 0 to 2, and y is a numerical value of 2/3 to 2 satisfying an electrically neutral condition of the chemical formula.
Claim 4
Dependent Claim
59 words
A heat-resistant sintered body comprising a solid solution of R y Zr₄Si x P 6-x O₂₄ system, wherein R is at least one element capable of forming bivalent or trivalent cation, x is a numerical value of 0 to 2, and y is a numerical value of 2/3 to 2 satisfying an electrically neutral condition of the chemical formula.
Claim 5
Dependent Claim
87 words
A heat-resistant phosphate based compound sintered body containing not less than 10% by weight of a solid solution of R y Zr₄Si x P 6-x O₂₄ system, wherein R is at least one element capable of forming bivalent or trivalent cation, x is a numerical value of 0 to 2, and y is a numerical value of 2/3 to 2 satisfying an electrically neutral condition of the chemical formula, and having a weight-reduced percentage of not more than 10% after heat treatment at 1,400°C for 100 hours.
Claim 6
Dependent Claim
87 words
A heat-resistant phosphate based compound sintered body containing not less than 10% by weight of a solid solution of R y Zr₄Si x P 6-x O₂₄ system, wherein R is at least one element capable of forming bivalent or trivalent cation, x is a numerical value of 0 to 2, and y is a numerical value of 2/3 to 2 satisfying an electrically neutral condition of the chemical formula, and having a weight-reduced percentage of not more than 10% after heat treatment at 1,400°C for 100 hours.
Claim 7
Independent Claim
113 words
A method of producing a heat-resistant sintered body, which comprises molding and firing a batch mixture of materials selected from ZrP₂O₇, (ZrO)₂P₂O₇, ZrO₂, Zr(OH)₄, ZrSiO₄, SiO₂, a phosphate of R, a silicate of R and RO (where R is an element capable of forming bivalent or trivalent cation) to precipitate a solid solution of R y Zr₄Si x P 6-x O₂₄ system, wherein R is at least one element capable of forming bivalent or trivalent cation, x is a numerical value of 0 to 2, and y is a numerical value of 2/3 to 2 satisfying an electrically neutral condition of the chemical formula, as a main crystalline phase of the sintered body.
Claim 8
Independent Claim
113 words
A method of producing a heat-resistant sintered body, which comprises molding and firing a batch mixture of materials selected from ZrP₂O₇, (ZrO)₂P₂O₇, ZrO₂, Zr(OH)₄, ZrSiO₄, SiO₂, a phosphate of R, a silicate of R and RO (where R is an element capable of forming bivalent or trivalent cation) to precipitate a solid solution of R y Zr₄Si x P 6-x O₂₄ system, wherein R is at least one element capable of forming bivalent or trivalent cation, x is a numerical value of 0 to 2, and y is a numerical value of 2/3 to 2 satisfying an electrically neutral condition of the chemical formula, as a main crystalline phase of the sintered body.
Claim 9
Independent Claim
116 words
A method of producing a heat-resistant phosphate based compound sintered body, comprises molding and firing a batch mixture of materials selected from ZrP₂O₇, (ZrO)₂P₂O₇, ZrO₂, ZrSiO₄, SiO₂, a phosphate of R, a silicate of R and RO (where R is an element capable of forming bivalent or trivalent cation) to form a sintered body containing not less than 10% by weight of a solid solution of R y Zr₄Si x P 6-x O₂₄ system, wherein R is at least one element capable of forming bivalent or trivalent cation, x is a numerical value of 0 to 2, and y is a numerical value of 2/3 to 2 satisfying an electrically neutral condition of the chemical formula.
Claim 10
Independent Claim
116 words
A method of producing a heat-resistant phosphate based compound sintered body, comprises molding and firing a batch mixture of materials selected from ZrP₂O₇, (ZrO)₂P₂O₇, ZrO₂, ZrSiO₄, SiO₂, a phosphate of R, a silicate of R and RO (where R is an element capable of forming bivalent or trivalent cation) to form a sintered body containing not less than 10% by weight of a solid solution of R y Zr₄Si x P 6-x O₂₄ system, wherein R is at least one element capable of forming bivalent or trivalent cation, x is a numerical value of 0 to 2, and y is a numerical value of 2/3 to 2 satisfying an electrically neutral condition of the chemical formula.
Claim 11
Dependent Claim
30 words
The method according to claim 4 or 5, wherein said firing is carried out at a temperature of not lower than 1,400°C for a time of 1 to 24 hours.
References Cited (Backward Citations)
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