COMBUSTION SYNTHESIS OF POWDERS FOR ADVANCED CERAMIC MATERIALS

Award Information
Agency: National Science Foundation
Branch: N/A
Contract: N/A
Agency Tracking Number: 14256
Amount: $49,967.00
Phase: Phase I
Program: SBIR
Awards Year: 1991
Solitcitation Year: N/A
Solitcitation Topic Code: N/A
Solitcitation Number: N/A
Small Business Information
Aerochem Research Laboratories
P.o. Box 12, Princeton, NJ, 08542
Duns: N/A
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 H.f. Calcote
 Director Of Research
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
FINE, ULTRAPURE, SPHERICAL PARTICLES ARE DESIRABLE STARTING MATERIALS FOR PRODUCING HIGH PERFORMANCE ADVANCED CERAMIC PRODUCTS. AEROCHEM HAS A UNIQUE FLAME SYNTHESIS PROCESS FORPREPARING SUCH HIGH QUALITY POWDERS, INCLUDING SILICON NITRIDE. THIS PROCESS DIFFERS FROM THE USUAL COMBUSTION SYNTHESIS IN THAT NO OXYGEN IS USED: THE PARTICLE-PRODUCING REACTANTS ALSO SUPPORT THE FLAME. FOR SILICON NITRIDE, SILANE, AMMONIA, HYDRAZINE, AND NITROGEN ARE BURNED ON A FLAT FLAME BURNER. A HIGH QUALITY POWDER IS PRODUCED OF WHICH A SAMPLE, WITHOUT ADDITIVES, WAS SUCCESSFULLY SUBJECTED TO HOT ISOSTATIC PRESSING. HOWEVER, THE USE OF HYDRAZINE MAKES THE PROCESS COMMERCIALLY UNACCEPTABLE BECAUSE OF THE COST, EXPLOSIVE NATURE, AND TOXICITY OF HYDRAZINE. WHILE THERMODYNAMIC AND OTHER CONSIDERATIONS INDICATE THAT AMMONIA SHOULD SUPPORT A FLAME WITHOUT HYDRAZINE PRESENT, WE HAVE NOT BEEN ABLE TO OPERATE WITHOUT SOME HYDRAZINE. A COMPUTER MODELING STUDY IS PROPOSED TO UNDERSTAND WHY THE AMMONIA/SILANE SYSTEM DOES NOT SUPPORT A FLAME UNDER THE CONDITIONS WHICH HAVE BEEN EMPLOYED, AND TO DEFINE THE CONDITIONS UNDER WHICH A FLAME COULD BE SUPPORTED. EXPERIMENTS WILL THEN BE PERFORMED TO DETERMINE THE PRACTICAL FEASIBILITY OF OPERATING UNDER THE DEFINED CONDITIONS. SUCCESSFUL COMPLETION OF THIS PROGRAM WOULD MAKE AVAILABLE FOR ADVANCED CERAMIC MANUFACTURE A HIGHER QUALITY POWDER THAN IS CURRENTLY AVAILABLE.

* information listed above is at the time of submission.

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