QUASI-WELD-FREE AND NANOCRYSTALLINE APPROACHES TO LONG-LIFE BELLOWS SEALS IN CRYOCOOLERS & OTHER RECIPROCATING MACHINES

Award Information
Agency: Department of Defense
Branch: Missile Defense Agency
Contract: N/A
Agency Tracking Number: 25618
Amount: $55,849.00
Phase: Phase I
Program: SBIR
Awards Year: 1994
Solitcitation Year: N/A
Solitcitation Topic Code: N/A
Solitcitation Number: N/A
Small Business Information
Anco Engineers, Inc.
9937 Jefferson Blvd., #200, Culver City, CA, 00000
Duns: N/A
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Paul Ibanez
 (310) 204-5050
Business Contact
Phone: () -
Research Institution
N/A
Abstract
Two very different approaches to the sealing reliability probelm of reciprocating machines are to be investigated and compared. In one approach, bellows design improvements are the result of combining the excellent dead volume avoidance characteristics of welded bellows with the structural characteristics of formed bellows. Formed bellows avoid both the high strees concentration values and the large amount of uncertainty regarding these values by eliminating the need for circumferential welds. In the proposed design, circumferential welds are not used avoiding or minimizing fatigue problems which have caused failures whenever bellows-driven crycoolers have been tried. This combination of design improvements provides a Quasi-Weld-Free Bellows. The other approach being evaluated involves a material that shows promise of demonstrating greater resistance to the formation of fatigue cracks. This material is called nanocrystalline nickel or nickel alloy. A bellows can be made of this material by electro-forming processes.

* information listed above is at the time of submission.

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