For Manufacturing And Quality Control Of Polished Molybdenum Disks
Material — molybdenum of 99.95% purity degree.
Table 1.
|
|
Diameter, mm |
Thickness, mm |
Thickness permit, mm |
Permit deviation in parallelity, mm |
Permit deviation in flatness, mm, max. |
Roughness, μm |
|||
|
1 |
80 -–0,19 |
3.4 |
±0,1 |
£0.010 |
£0.004 |
£0.16 |
|||
|
2 |
56 –0,19 |
2.5 |
±0,2 |
£0.010 |
£0.004 |
£0.16 |
|||
|
3 |
40 –0,16 |
1.8 |
±0,2 |
£0.008 |
£0.003 |
£0.16 |
|||
|
4 |
32 –0,13 |
1.5 |
±0,2 |
£0.008 |
£0.003 |
£0.16 |
|||
|
5 |
24 –0,13 |
1.2 |
±0,1 |
£0.010 |
£0.004 |
£0.16 |
|||
Disks should be etched in a substance of the following composition:
Hydrochloric acid HCl chemically pure — 3 parts
Nitric acid HNO3 concentrated and chemically pure — 1 part
Etching period — 8-10 minutes.
There should be no etching cracks, skins, cut-offs or chips, rough edges, scratches, alien inclusions on disks surface. Way of controlling – visual. In doubtful cases the microscope with a magnifying glass 16x is used. Dividing into layers is not permitted.
|
The lot quantity, pcs. |
The selection quantity, pcs |
Acceptance reject items quantity, pcs |
Reject number, pcs |
||||||
|
151-280 |
32 |
2 |
3 |
||||||
|
281-500 |
50 |
3 |
4 |
||||||
|
501-1200 |
80 |
4 |
5 |
||||||
|
1200-3200 |
125 |
6 |
7 |
||||||
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