MIL-STD-869D
b. All material meets the chemical composition requirements as specified in the purchase order.
c. The material has been spray tested with oxygen-acetylene. Oxygen- acetylene combustion flame and plasma flame spray equipment, whichever is applicable. Insure that coatings can be produced that are smooth, uniform, and free from cracks and voids with required bond strength.
d. Material meets requirements of engineering and industry standards.
4.1.8 Gases. The following gases shall be used flame spraying:
GAS SPECIFICATION TYPE
Oxygen BB-O-925 Commercial Acetylene BB-A-106 Commercial Propane Commercial Hydrogen BB-H-886 Commercial
4.1.8.1 Gases for plasma flame spraying. Gases for the plasma flame spraying process shall be as follows:
GAS SPECIFICATIONS
Hydrogen Pre-Purified 99.5% Max-Oxygen Content 0.05% Max-Dewpoint -76°F
(-60°C)
Nitrogen Pre-Purified
Max-Oxygen Content 0.002% Max-Dewpoint -76°F (-60°C)
Argon High Purity
4.2 Bond Strength. Flame sprayed coatings have bond strengths ranging from
3.000 to a maximum 12.000 psi. Coatings should only be used where the bond strength of the coating is approved for a specific application by engineering authority.
4.3 Coating Material. The coating material must be specified by the responsible authority. Metallurgical laboratory testing may be required where deemed necessary.
4.4 Spraying Parameters. Air, fuel gas, primary and secondary pressures and flow settings for the spraying of each material shall be in accordance with those recommended by the equipment manufacturer's instructions manuals for each process.
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