Claims
- 1. A case nitrided aluminum product, comprising:
- (a) an aluminum body, and
- (b) a case nitrided surface layer of said aluminum body having a depth of 5 micrometers or more, and exhibiting a case hardness of from 250 to 1,200 micro Vickers hardness;
- said case nitrided surface layer comprising a mixed phase of aluminum nitride and aluminum and formed of a material having a needle-like shape and having a diameter of from 5 to 50 nm.
- 2. The case nitrided aluminum product according to claim 1, wherein said nitrided layer includes nitrogen in an amount of from 5 to 30% by weight.
- 3. The case nitride aluminum product according to claim 1, wherein said nitrided layer has a depth of 20 micrometers or more.
- 4. A case nitrided aluminum product according to claim 1 prepared by a process, comprising:
- contacting an aluminum substrate with a nitriding agent at a surface portion thereof, the nitriding agent comprising an aluminum powder; and
- nitriding the surface of the aluminum substrate with an ambient gas at a temperature below the melting point of the aluminum substrate while maintaining contact between said aluminum substrate with said nitriding agent, the ambient gas comprising a nitrogen gas.
Priority Claims (2)
Number |
Date |
Country |
Kind |
5-274878 |
Oct 1993 |
JPX |
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6-240386 |
Oct 1994 |
JPX |
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Parent Case Info
This is a division of application Ser. No. 08/317,525 filed Oct. 4, 1994, now U.S. Pat. No. 5,514,225.
US Referenced Citations (4)
Foreign Referenced Citations (6)
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Sep 1991 |
DEX |
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DEX |
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JPX |
62-153107 |
Jul 1987 |
JPX |
62-278202 |
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JPX |
Non-Patent Literature Citations (2)
Entry |
Scholz, H. & Greil, P., "Nitridation Reactions of Molten Al-(Mg, Si) Alloys," Journal of Materials Science, 26 (1991) 669-677. |
Soviet Patent Abstracts, A-M Chemical, Refractories; Ceramics page 4, week 9415, Jun. 1, 1994, Derwent Publications (abstract of SU 1415804-AI). |
Divisions (1)
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Number |
Date |
Country |
Parent |
317525 |
Oct 1994 |
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