A-A-52515 Powder, Chromium Carbide-Nickel Chromium Alloy (Metric)This CID covers a two-component powder containing chromium carbide and nickel chromium alloy particles mechanically distributed in a uniform mixture (75 chromium carbide and 25 nickel chromium) used in plasma spray coating operations. This powder is primarily intended for use as an anti-fretting coating for use in environments up to 815 Deg. C.

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A-A-52515

TABLE I. Component percentages by weight.

Component	Percentage (%)
A (Chromium carbide)	74-76
B (Nickel chromium alloy)	Remainder

2.1.2 Particle size. The particle size distribution by weight shall be as shown in table II.

TABLE II. Particle size distribution by weight.

Sieve designation 1/		% by weight				Weight Passed through sieve	Weight Retained on sieve
Sieve designation 1/		Chromium carbide		Nickel chromium alloy		Weight Passed through sieve	Weight Retained on sieve
Micrometer	Mesh	Min	Max	Min	Max	X
53	270	100	---	100	---	X
45	325	---	1	---	1		X
20	---	60	90	45	75	X
5	---		15	---	5	X

1/ Sieve designation in accordance with ASTM E11.

2.1.3 Chemical composition. The chemical composition of the material shall conform to the percent by weight for each element as specified in table III.

TABLE III. Chemical composition.

Elements	% by weight
	Chromium carbide		Nickel chromium alloy
	Min	Max	Min	Max
Manganese	---	---	---	2.5
Silicon	---	0.1	---	1.5
Iron	---	0.7	---	1.0
Carbon	12.5	---	---	0.25
Chromium	85.5	---	18.0	22.5
Nickel	---	---	76.0	80.0