Moly
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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 | ||||||
Power semiconductor devices, protection components and industrial power solutions.
