High Temperature

CATEGORY: Maskant Materials

High temperature coating masking materials are used primarily to prevent coating in selected areas during diffusion coating processes above 1500°F (815°C) for new and overhauled engines.

M-1 (S-8946)

A base-metal powder maskant used dry or as undercoating for other materials in the APV masking system. When used as a slurry mask, it is combined with B-4, B-100, or B-200 binders, and then topcoated with M-7 maskant. M-1 is relatively inert to superalloy base metals. After thermal processing, the M-1 becomes a soft powder and is readily removed from the surface by an air blast. No grit blasting or wire brushing is required. Metallographic examination shows alloy depletion of approximately 0.0003-0.0007 inches with coating processing of about 1,850°F – 2,050°F (1,010°C – 1,121°C).

M-5 (S-8115)

A base-metal powder maskant used to protect selected areas of nickel and iron based alloys/superalloys during chromium diffusion coating. It is used as a dry powder and does not necessitate a binder.

M-7 (S-8096)

An overcoating powder maskant which when combined with APV binder provides a top coating to the M-1 maskant. M-7 forms a tight envelope (cocoon) over the M-1 after coating thermal processing. After processing, the envelope is hard and retains both the M-1 and itself intact, thereby avoiding contamination of the coating pack or coating mix source material during removal. The M-7 envelope is easily cracked open by striking with a wooden, plastic, or rubber implement. The easily removable, soft M-1 is readily evident under the M-7. M-7 Green is also available where color is required by the user to make it distinguishable from the part to be coated.

M-10 (S-8101)

A finer particle (mesh) size version of M-1 maskant that provides approximately 50% reduction in particle size.

M-17 (S-8917)

A base-metal powder maskant combining M-1 and M-7. It can be used dry or as a slurry mask when combined with B-4, B-100 or B-200. When used in slurry form it does not necessarily require separate coats of M-1 and M-7.

M-13 (S-8213)

An overcoating powder maskant that provides a top coating to the M-1 maskant. The advantage of using M-13 instead of M-7 is that it does not require aluminum to create a tight envelope (cocoon) after thermal treatment. It is especially effective in pure CVD coating processes, which do not usually introduce the coating gases until the part to be coated reaches the coating temperatures.


Step by Step Application Process:

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