Accession Number : ADA311790

Title :   Processing of Interconnected Glass and Ceramic Composites for Electronic Packaging.

Descriptive Note : Final rept. 27 Jul 94-26 Apr 96,

Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Kumta, Prashant N.

PDF Url : ADA311790

Report Date : 09 JUL 1996

Pagination or Media Count : 96

Abstract : Glasses and glass-ceramics are well known for their low dielectric constant (epsilon approx. 3-5) at 1MHz which make them useful substrate materials for high speed electronic packaging. On the other hand, crystalline ceramics such as AlN have moderate dielectric constants (epsilon approx. 9-12) at 1MHz high thermal conductivity useful for high power packages. Porous and glass infiltrated ceramic composites with interconnected high thermal conductivity phases therefore, have the potential of possessing optimum dielectric constant (approx. 5) and thermal conductivity (approx.20-60 W/m-K) for substrate applications. This report discusses the results of the work conducted in processing interconnected porous composites of AlN, and also low dielectric constant glasses and glass- ceramics in the B2O3-P2O5-SiO2 system. A systematic investigation has been conducted to study the effect of pre-treatment of AlN powders in ammonia on their sinterability. At the same time, the combined effects of this pretreatment and the influence of volume fraction on thermal conductivity has been studied. Similarly, studies have been conducted to understand the structure of the oxide glasses, their sinterability, and the effect of nitrogen substitution on their dielectric constant.

Descriptors :   *ELECTRONIC EQUIPMENT, *GLASS, *CERAMIC MATERIALS, *PACKAGING, HIGH POWER, OPTIMIZATION, SILICON DIOXIDE, POWDERS, PROCESSING, COMPOSITE MATERIALS, SUBSTRATES, CRYSTALS, NITRIDES, NITROGEN, AMMONIA, DIELECTRIC PROPERTIES, OXIDES, ALUMINUM, CONSTANTS, THERMAL CONDUCTIVITY, POWER, BORON, PHOSPHORUS, POROUS MATERIALS, SINTERING.

Subject Categories : Ceramics, Refractories and Glass
      Inorganic Chemistry
      Electrical and Electronic Equipment
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE