50 Kw

Traverse Rate

100 sfpm

100 sfpm

Powder Feed Rate

6 Lbs./Hr.

10 Lbs./Hr.

Preheat

None

1800°F

Spray Distance

5 In.

12 In.

Other

90° air imp cooling

40 torr Abs. Press., RTA cleaned

used. A line source of Chromium radiation was used at operating conditions of 35 KV and 20 mA. A Soller slit assembly and a 1" divergent slit were used on the incident beam side. A receiving slit, a Soller slit assembly and a diffracted beam monochrometer with a graphite crystal were used on the diffracted beam side. The diffracted beam intensity was detected by scintillation detector. The diffractometer was calibrated periodically with Si (311) diffraction peak from an NBS standard powder sample. The procedure for getting a diffractogram consisted of initially step scanning intervals of 0.25' of 20 and of 40 seconds counting time of at each step. Initial scanning of samples was done in the 20 angle range of 20*-150". Subsequently, all samples were analyzed by slow step scanning by intervals of 0.05' of 20* in angular ranges closer to strong diffraction peaks.

More attention was paid to angular ranges of 90-104' and 120-135* of 20, where the resolution of (311) and (113) tetragonal peaks in the formal angle range and (400) and (004) tetragonal peaks in the latter range becomes possible. A quantitative analytical program was established to determine the phase distribution within each powder or coating.

Powder distributions were reformulated using an Alpine Model 100 cyclonic separator followed by blending to meet the required distribution. The distribution of the separated sizes could be adjusted by changing the rotational velocity of the turbine wheel and the gas pressure used.

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