EP0285312A2
Expired / Lapsed
EP
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Ceramic materials to be insert-cast and ceramic port liners
Assignee: NGK Insulators Ltd
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Filing: 1988-03-23
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Granted: —
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Expires: 2008-03-23
Abstract
Abstract Ceramic materials to be insert-cast contain not less than 65% of aluminum titanate as a crystalline phase, and have an average particle diameter of crystals thereof being not less than 10 µm, Young's modulus of 50 to 2,000 kgf/mm², compression strength of 5 to 40 kgf/mm², and porosity of 5 to 35%. These liners are free from cracking due to compression force during insert-casting, peeling-off during use, and facilitate insert-casting. In a port liner having a depressed portion at an outer peripheral surface, a reinforcement is filled into the depression which meets either one or both of requirements that differences in coefficient of thermal expansion at 800°C and Young's modulus between the reinforcement and the material of the liner body are in a range of ±0.1% and in a range of ±1,000 kgf/mm², respectively. Alternatively, the outer peripheral surface of the port liner body is worked to give an uneven surface where the liner is joined to a metal in insert-casting, or a stress-releasing slit may be formed in a wall of the port liner body. Further, the outer peripheral surface of the ceramic port liner body may be covered with a ceramic sheet which is irreveribly expandable by heating.
Inventors
- 👤 Toshiyuki Hamanaka
- 👤 Takashi 32 Ngk Kita-Kazoku Apartments Harada
- 👤 Fumio Hattori
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 17:12
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4264; F02F1/4271; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/478; F01; F01N; F01N13/00; F01N13/08; F01N13/10; F01N13/102; F01N13/16; F02B; F02B77/00; F02B77/02; F02F1/4214; F02F7/00; F02F7/0085; F02F7/0087; F02B1/00; F02B1/02; F02B1/04; F02B3/00; F02B3/06; F02F2001/008; F02F2001/244; F02F2001/245; F02F2001/4278; F02F2200/00; F02F2200/06; F05; F05C; F05C2203/00; F05C2203/08; F05C2251/00; F05C2251/04; F05C2251/042; F05C2253/00; F05C2253/16
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
57 words
A ceramic materials to be insert-cast, which contains not less than 65% of aluminum titanate as a crystalline phase, and has an average particle diameter of crystals of said aluminum titanate being not less than 10 µm, Young's modulus of 50 to 2,000 kgf/mm², compression strength of 5 to 40 kgf/mm², and porosity of 5 to 35%.
Claim 2
Dependent Claim
57 words
A ceramic materials to be insert-cast, which contains not less than 65% of aluminum titanate as a crystalline phase, and has an average particle diameter of crystals of said aluminum titanate being not less than 10 µm, Young's modulus of 50 to 2,000 kgf/mm², compression strength of 5 to 40 kgf/mm², and porosity of 5 to 35%.
Claim 3
Dependent Claim
30 words
A ceramic material to be insert-cast according to claim 1, wherein an average coefficient of thermal expansion in a temperature range from 40°C to 800°C is not more than 2.0×10⁻⁶/°C.
Claim 4
Dependent Claim
24 words
A ceramic material to be insert-cast according to claim 1 or 2, wherein thermal conductivity is in a range from 0.8×10⁻³ to 5.0×10⁻³ cal/cm·sec°C.
Claim 5
Dependent Claim
27 words
A ceramic material to be insert-cast according to any one of claims 1 to 3, wherein Young's modulus is in a range from 50 to 200 kgf/mm².
Claim 6
Dependent Claim
54 words
A ceramic material to be insert-cast according to any one of claims 1 to 4 wherein said ceramic material has a chemical composition of from 40 to 65% of Al₂O₃, from 30 to 60% of TiO₂, and at least one of SiO₂, MgO and Fe₂O₃ in a total amount of not more than 10%.
Claim 7
Dependent Claim
33 words
A ceramic material to be insert-cast according to any one of claims 1 to 5 which contains at least one of rutile, corundum and mullite as a crystalline phase other than aluminum titanate.
Claim 8
Dependent Claim
30 words
A ceramic material to be insert-cast according to any one of claims 1 to 6, said ceramic material being adapted to be used as engine port liners and/or manifold liners.
Claim 9
Dependent Claim
99 words
A ceramic port liner comprises a port liner body having a depressed portion at an outer peripheral surface thereof, and a reinforcement integrally filled into said depressed portion so that the ceramic port liner has an integral structure with a flat or swelled surface thereon, said reinforcement meeting either one or both of the requirements that the difference in coefficient of thermal expansion at 800°C between the material constituting the port liner body and that of the reinforcement is in a range of ±0.1% and that the difference in Young's modulus therebetween is in a range of ±1,000 kgf/mm².
Claim 10
Dependent Claim
99 words
A ceramic port liner comprises a port liner body having a depressed portion at an outer peripheral surface thereof, and a reinforcement integrally filled into said depressed portion so that the ceramic port liner has an integral structure with a flat or swelled surface thereon, said reinforcement meeting either one or both of the requirements that the difference in coefficient of thermal expansion at 800°C between the material constituting the port liner body and that of the reinforcement is in a range of ±0.1% and that the difference in Young's modulus therebetween is in a range of ±1,000 kgf/mm².
Claim 11
Dependent Claim
25 words
A ceramic port liner according to claim 8, wherein the port liner body is made of an aluminum titanate-based ceramic material having low Young's modulus.
Claim 12
Dependent Claim
29 words
A ceramic port liner according to claim 8 or 9, wherein the reinforcement is made of a material having the same properties as that of the port liner body.
Claim 13
Dependent Claim
46 words
A ceramic port liner comprising a port liner body made of a ceramic material, and worked portions formed on an outer peripheral surface of the port liner body to give uneven portions at a joining surface thereof to a metal for encasting the port liner body.
Claim 14
Dependent Claim
46 words
A ceramic port liner comprising a port liner body made of a ceramic material, and worked portions formed on an outer peripheral surface of the port liner body to give uneven portions at a joining surface thereof to a metal for encasting the port liner body.
Claim 15
Dependent Claim
16 words
A ceramic port liner according to claim 11, wherein said outer peripheral surface-worked portions are grooves.
Claim 16
Dependent Claim
16 words
A ceramic port liner according to claim 11, wherein said outer peripheral surface-worked portions are projections.
Claim 17
Dependent Claim
21 words
A ceramic port liner according to claim 11, wherein said outer peripheral surface-worked portions consist of a number of closed cells.
Claim 18
Dependent Claim
30 words
A ceramic port liner according to any one of claims 11 to 14, wherein said port liner body is made of an aluminum titanate-based ceramic material having low Young's modulus.
Claim 19
Dependent Claim
45 words
A ceramic port liner comprising a ceramic port liner body with a depressed portion at an outer peripheral surface thereof, and a slit formed in a wall of the port liner body, said slit being adapted to relieve stress applied upon the port liner body.
Claim 20
Dependent Claim
45 words
A ceramic port liner comprising a ceramic port liner body with a depressed portion at an outer peripheral surface thereof, and a slit formed in a wall of the port liner body, said slit being adapted to relieve stress applied upon the port liner body.
Claim 21
Dependent Claim
16 words
A ceramic port liner according to claim 16, wherein said slit is filled with ceramic fibers.
Claim 22
Dependent Claim
39 words
A ceramic port linear according to claim 16 or 17, wherein said slit is formed on upper and lower side walls of the wall of the port liner body, said upper and lower side walls facing the depressed portion.
Claim 23
Dependent Claim
39 words
A ceramic port liner according to claim 16 or 17, wherein said is formed from an end face of an exhaust opening of the port liner body along a direction in which a gas flows through the port liner.
Claim 24
Dependent Claim
30 words
A ceramic port liner according to any one of claims 16 to 19 wherein the port liner body is made of an aluminum titanate-based ceramic material having low Young's modulus.
Claim 25
Dependent Claim
38 words
A ceramic port liner comprising a port liner body made of a ceramic material, and a ceramic sheet coated around an outer peripheral surface of the port liner body, said ceramic fiber sheet being irreversibly expandable by heating.
Claim 26
Dependent Claim
38 words
A ceramic port liner comprising a port liner body made of a ceramic material, and a ceramic sheet coated around an outer peripheral surface of the port liner body, said ceramic fiber sheet being irreversibly expandable by heating.
Claim 27
Dependent Claim
26 words
A ceramic port liner according to claim 21, wherein said ceramic sheet is made of vermiculite, ceramic fibers, and a fine amount of an organic binder.
References Cited (Backward Citations)
No citation records indexed.
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