Claims
- 1. An exhaust valve for a Diesel engine, wherein a seat face thereof is formed with coated layer comprising ceramic and metal, the coated layer increasing in density of ceramic toward an upper surface thereof, wherein the coated layer comprises a plurality of layers which each vary in ceramic density, and wherein the coated layer comprises a double structure.
- 2. The valve of claim 1, wherein an upper layer of said double structure is ceramic and a lower lower layer is metal.
- 3. The valve of claim 1, wherein an upper layer is ceramic and metal complex layer and a lower layer is metal.
- 4. The valve of claim 1, wherein said coated layer is subjected to press heat treatment.
- 5. An exhaust valve for a Diesel engine, wherein a seat face thereof is formed with coated layer comprising ceramic and metal, the coated layer increasing in density of ceramic toward an upper surface thereof, wherein the coated layer comprises a plurality of layers which each vary in ceramic density, and wherein the coated layer comprises a triple structure.
- 6. The valve of claim 5 wherein an upper layer is ceramic, a lower layer is metal, and a middle layer is ceramic and metal complex layer.
- 7. The valve of claim 5, wherein an upper layer and a middle layer are of ceramic and metal complex, and a lower layer is of metal.
- 8. The valve of claim 5, wherein an upper layer is ceramic, and middle and lower layers are of metal.
- 9. The valve of claim 5, wherein an upper layer is ceramic and metal complex layer, and middle and lower layers are metal.
- 10. The valve of claim 5, wherein said coated layer is subjected to press heat treatment.
- 11. An exhaust valve for a Diesel engine, wherein a seat face thereof is formed with coated layer comprising ceramic and metal, the coated layer increasing in density of ceramic toward an upper surface thereof, wherein the coated layer comprises a plurality of layers which each vary in ceramic density, and wherein the coated layer comprises at least four layers.
- 12. The valve of claim 11, wherein an upper layer is of ceramic, a lower layer is metal and middle layers are ceramic and metal complex having a higher ceramic density toward an upper surface.
- 13. The valve of claim 11, wherein a lowest layer is of metal, and other layers are of ceramic and metal complex.
- 14. The valve of claim 11, wherein a complex layer at a lower layer is of metal and other layers are of metal and ceramic complex.
- 15. The valve of claim 11, wherein a complex layer at a lower layer is of metal, and an upper most layer is ceramic, and other layers are of metal and ceramic complex.
- 16. The valve of claim 11, wherein layers at an upper side are of ceramic and metal complex, and other layers are of metal.
- 17. The valve of claim 11, wherein an uppermost layer is of ceramic, and other layers are of metal.
- 18. The valve of claim 11, wherein an uppermost layer is ceramic and metal complex, and other layers are of metal.
- 19. The valve of claim 11, wherein said coated layer is subjected to press heat treatment.
Priority Claims (2)
Number |
Date |
Country |
Kind |
55-152264 |
Oct 1980 |
JPX |
|
56-149620 |
Sep 1981 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 315,666, filed 10/28/81, now U.S. Pat. No. 4,530,322.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2856232 |
Jul 1980 |
DEX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
315666 |
Oct 1981 |
|