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MIL-P-85856/6 1988 Edition, December 7, 1988
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POWDER MATERIALS FOR FLAME AND PLASMA SPRAYED COATINGS COBALT BASE, TYPE I, CLASS 2, COMPOSITION C
Includes all amendments and changes through Interim Notice 2, September 4, 1998
Additional Comments: INACTIVE FOR NEW DESIGN
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This specification is approved for use by all Departments and Agencies of the Department of Defense.

The complete requirements for acquiring the powder described herein shall consist of this document and the latest issue of MIL-P-85856.

Chemical Composition(1)
Cr      Ni    Fe      W     C     Mn     Si      Co    P      S
-----------------------------------------------------------------
24.5    9.5   2.0    7.0   0.42   1.0    1.0    Bal   0.04   0.04
26.5   11.5   max.   8.0   0.55   max.   max.         max.   max.




Particle Size/Distribution

−170 Mesh (−90 µm)   100.0 min.
−200 Mesh (−75 µm)    95.0 min.
+325 Mesh (+45 µm)    90.0 min.

Sprayed Coating Properties

Bond Strength        41.0 MPa (6000 psi) min.

Hardness             Rockwell 15N, 75 min.

Microstructure       See paragraph 4.5.4.1.2
                     Porosity - 15% max.
                     Unmelted Particles - 15% max.


Deposit Efficiency and Deposition Rate

65% min for N2/H2 @ 15.0 lb/hr
30% min for A/H2 @ 7.0 lb/hr




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