Claims
- 1. A method of improving the corrosion resistance of far-infrared emitter comprising a body made from a stainless steel comprising from 20% to 35% by weight of chromium and a chromium oxide layer formed on the stainless steel body by high temperature oxidation treatment with a thickness corresponding to a weight of at least 0.2 mg/cm.sup.2, wherein the method comprises including in the stainless steel from 0.5 to 5.0% by weight of molybdenum, up to 3.0% by weight of manganese, and up to 3.0% by weight of silicon, the balance being iron and unavoidable impurities.
- 2. A method of improving the emissivity of a far-infrared emitter comprising a body made from a stainless steel comprising from 10% to 35% by weight of chromium and a chromium oxide layer formed on the stainless steel body by high temperature oxidation treatment with protrusions having a length of at least 5 microns, wherein the method comprises including in the stainless steel from 1.0 to 4.0% by weight of silicon and up to 3.0% by weight of molybdenum, the balance being iron and unavoidable impurities.
- 3. In a far-infrared emitter comprising a body made from a stainless steel comprising from 20% to 35% by weight of chromium and a chromium oxide layer formed on the stainless steel body by high temperature oxidation treatment with a thickness corresponding to a weight of at least 0.2 mg/cm.sup.2, wherein the improvement comprises the stainless steel further comprising from 0.5% to 5.0% by weight of molybdenum, up to 3.0% by weight of manganese, and up to 3.0% by weight of silicon, the balance being iron and unavoidable impurities, said improvement resulting in the far-infrared emitter being substantially rust-free.
- 4. The far-infrared emitter according to claim 3, wherein the far-infrared emitter is completely rust-free.
- 5. In a far-infrared emitter comprising a body made from a stainless steel comprising from 10% to 35% by weight of chromium and a chromium oxide layer formed on the stainless steel body by high temperature oxidation treatment with protrusions having a length of at least 5 microns, wherein the improvement comprises the stainless steel further comprising from 1.0% to 4.0% by weight of silicon and up to 3.0% by weight of molybdenum, the balance being iron and unavoidable impurities, said improvement resulting in the far-infrared emitter having an emissivity of at least 0.7.
- 6. A far-infrared emitter according to claim 5, wherein the far-infrared emitter has an emissivity of at least 0.8.
- 7. A far-infrared emitter according to claim 5, wherein the far-infrared emitter has an emissivity of at least 0.9.
Priority Claims (2)
Number |
Date |
Country |
Kind |
63-184630 |
Jul 1988 |
JPX |
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63-184631 |
Jul 1988 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 07/371,083 filed Jun. 26, 1989, now abandoned.
US Referenced Citations (11)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0034133 |
Aug 1981 |
EPX |
0091526 |
Oct 1983 |
EPX |
0290719 |
Jan 1988 |
EPX |
2093073A |
Aug 1982 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
371083 |
Jun 1989 |
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