Standard Historical Last Updated: Jul 06, 2011 Track Document
ASTM F44-95(2006)

Standard Specification for Metallized Surfaces on Ceramic

Standard Specification for Metallized Surfaces on Ceramic F0044-95R06 ASTM|F0044-95R06|en-US Standard Specification for Metallized Surfaces on Ceramic Standard new BOS Vol. 10.04 Committee F01
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Abstract

This specification covers requirements for powdered refractory metal coatings produced with or without additives. These coatings are applied to ceramic bodies in order to join ceramic bodies to metals or to other metallized ceramics by means of brazing or soldering. Included in this specification are requirements for a secondary metallic layer which is usually applied over the refractory metal layer. Two levels of quality for uniformity of metallizing are discussed, Level A and Level B. These levels discuss conditions and requirements needed in order to accept the uniformity of metallizing. Thickness of metallizing shall be measured using a metallurgical microscope. A polished cross-section that is perpendicular to the metallized surfaced is measured. The particles in the metallized layer must be sintered in order to form a dense matrix when viewed in cross section at 400 times. This cross section will indicate the extent of threedimensional sintering. A torque peel test and a tension test shall be performed in order to determine the bond strength of brazed metallized ceramics. Vacuum tightness of the brazed metallized ceramics shall also be determined.

Scope

1.1 This specification covers requirements for powdered refractory metal coatings produced with or without additives. These coatings are applied to ceramic bodies in order to join ceramic bodies to metals or to other metallized ceramics by means of brazing or soldering. Included in this specification are requirements for a secondary metallic layer which is usually applied over the refractory metal layer.

1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

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Details
Book of Standards Volume: 10.04
Developed by Subcommittee: F01.03
Pages: 3
DOI: 10.1520/F0044-95R06