How to polish Zr2O3 coating to Ra3.2
06-13-2016, 01:40 PM
|How to polish Zr2O3 coating to Ra3.2
Does anybody know what's the procedure to make APS Zr2O3 coating with roughness of Ra3.2 um ? And how to protect cooling hole of parts during spraying?
06-23-2016, 05:40 PM
|RE: How to polish Zr2O3 coating to Ra3.2
The roughness you ask for is not so smooth, you ask for a coating with roughness of Ra 3.2 µm, so it'is enough to use a diamond grinding wheel Grit Size C150 / 6,6 ct/mm3 , and in order to protect the cooling holes of parts during spraying, you can use a graphite (or sometime Cu) pin wedge with the appropriate dimensions.
Formulas for determining minimum stock removal required on diameter to achieve desired surface finish are as follow:
Surface Finish in Micrometers-(µm) Ra
(Existing Finish - Desired Finish) /100 = Required Stock Removal
Existing Finish = 5.25 µm; Desiderated Finish = 3.25 µm
(5.25 – 3.25) /100 =0.02 mm
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