Accession Number : ADA327502

Title :   Pressureless Infiltration of Ceramics by Molten Metals.

Descriptive Note : Annual rept.,

Corporate Author : COLORADO SCHOOL OF MINES GOLDEN CENTER FOR WELDING AND JOINING RESEARCH

Personal Author(s) : Chidambaram, P. R. ; Edwards, G. R.

PDF Url : ADA327502

Report Date : DEC 1995

Pagination or Media Count : 105

Abstract : Pressureless infiltration of molten metals into ceramics is perhaps the most cost- effective approach to liquid-metal processing of metal-matrix composites. Two approaches are currently being investigated for their respective pressureless infiltration potential. A 'carrier oxide' approach to infiltration relies on the use of a intermediary liquid oxide which carriers the liquid metal into the capillary channels of the porous ceramic. The effectiveness of this approach was discovered by understanding the nature of wetting and spreading in copper-oxygen and copper-titanium alloy liquids in contact with alumina substrates. Aluminum oxide, a relatively cheap reinforcing material, does not develop an interface with liquid aluminum, but titanium readily wets aluminum oxide. Titanium-coated aluminum oxide surfaces are energetically conducive to the pressureless infiltration of liquid aluminum. Results from the above two approaches are discussed in detail in the following sections.

Descriptors :   *METALS, *CERAMIC MATERIALS, PROCESSING, COMPOSITE MATERIALS, COPPER ALLOYS, MELTS, MATRIX MATERIALS, SUBSTRATES, COSTS, OXYGEN, WETTING, ALUMINUM OXIDES, REINFORCING MATERIALS, TITANIUM ALLOYS, POROUS MATERIALS, LIQUID METALS.

Subject Categories : Ceramics, Refractories and Glass
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE