ASTM F 1438 : 1993 : R2012
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Standard Test Method for Determination of Surface Roughness by Scanning Tunneling Microscopy for Gas Distribution System Components
Hardcopy , PDF
03-12-2023
English
01-07-2012
Important note : Users cannot be edited or removed once added to your Multi user PDF.CONTAINED IN VOL. 10.04, 2015 Defines a method for analysing the surface texture of gas distribution system components using a scanning tunneling microscope (STM). Assumes that the STM operator understands the use of the instrument, its governing principles, and any artifacts that can arise.
| Committee |
F 01
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| DocumentType |
Test Method
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| Pages |
10
|
| ProductNote |
Reconfirmed 2012
|
| PublisherName |
American Society for Testing and Materials
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
1.1The purpose of this test method is to define a method for analyzing the surface texture of the above-mentioned components using a scanning tunneling microscope (STM). STM is a noncontact method of surface profiling that can measure three-dimensional surface features in the nanometer size range, which can then be used to represent the surface texture or to provide figures of merit. Application of this test method, where surface texture is used as a selection criterion, is expected to yield comparable data among different components tested.
1.2.1This test method is limited to characterization of stainless steel surfaces that are smoother than R a = 0.25 μm, as determined by a contact-stylus profilometer and defined by ANSI B46.1. The magnifications and height scales used in this test method were chosen with this smoothness in mind.
1.2.2Intentional etching or conductive coating of the surface are considered modifications of the gas-wetted surface and are not covered by this test method.
1.2.3This test method does not cover steels that have an oxide layer too thick to permit tunneling under the test conditions outlined in 11.3.
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