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ASTM International - ASTM C664-10(2020)

Standard Test Methods for Thickness of Diffusion Coating

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Organization: ASTM International
Publication Date: 1 November 2020
Status: active
Page Count: 3
ICS Code (Properties of surfaces): 17.040.20
significance And Use:

3.1 A diffusion coating is one produced by causing an element or elements to react with or diffuse into, or both, the surface of a metallic substrate, thus chemically altering the substrate... View More

scope:

1.1 These test methods cover two procedures for measuring the thickness of diffusion coatings.

1.2 Test Method A is the determination of the dimensional-change thickness, defined as the difference in the thickness of the part before and after coating. (The terms micrometer thickness and part growth are considered synonymous with dimensional change thickness.)

1.3 Test Method B is the determination of total coating thickness, defined as the distance between the observably unaffected substrate and the exterior surface of the coating. This includes the total of all included phases, zones and layers. (The term case depth is considered to be synonymous with total coating thickness.) The total coating thickness is determined by cross-sectioning the coating, preparing a metallurgical mount and microscopically measuring the coating thickness.

1.4 The total coating thickness as determined microscopically from a cross-section will usually be greater than, or equal to, the dimensional change thickness determined by part growth. When the coating is produced primarily by reaction with the substrate, the substrate-coating interface recedes as the substrate is consumed in the reaction. In such cases the difference between the total coating thickness and the dimensional change thickness is the thickness of the substrate consumed.

1.5 Diffusion coatings are usually formed at elevated temperatures for service at elevated temperatures. This means that diffusion coatings are dynamic systems which are continually undergoing changes while in an elevated-temperature environment. It is necessary to know that certain phases are growing at the expense of others and to know the previous history of a coating to understand the significance of coating thickness data.

1.6 Values in SI units are to be regarded as the standard. Inch-pound units are provided for information only.

1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Document History

ASTM C664-10(2020)
November 1, 2020
Standard Test Methods for Thickness of Diffusion Coating
1.1 These test methods cover two procedures for measuring the thickness of diffusion coatings. 1.2 Test Method A is the determination of the dimensional-change thickness, defined as the difference...
May 1, 2015
Standard Test Methods for Thickness of Diffusion Coating
1.1 These test methods cover two procedures for measuring the thickness of diffusion coatings. 1.2 Test Method A is the determination of the dimensional-change thickness, defined as the difference...
April 1, 2010
Standard Test Methods for Thickness of Diffusion Coating
1.1 These test methods cover two procedures for measuring the thickness of diffusion coatings. 1.2 Test Method A is the determination of the dimensional-change thickness, defined as the difference...
September 15, 2005
Standard Test Methods for Thickness of Diffusion Coating
1.1 These test methods cover two procedures for measuring the thickness of diffusion coatings. 1.2 Test Method A is the determination of the dimensional-change thickness, defined as the difference in...
March 10, 1999
Standard Test Methods for Thickness of Diffusion Coating
1.1 These test methods cover two procedures for measuring the thickness of diffusion coatings. 1.2 Method A is the determination of the dimensional-change thickness, defined as the difference in the...
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