| However, the market for NF3 use is growing rapidly, particularly as a plasma etchant and equipment cleaning agent. |
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| Frequently, poor results are achieved when this etchant is used on mechanically prepared specimens of many aluminium materials. |
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| When there is a gap between sample and resin water, alcohol or etchant can bleed out of the gap during drying or even on the microscope. |
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| One disadvantage of this etchant is its extremely sensitive reaction to remnant deformation layers on the surface of the prepared specimen. |
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| The only really universal etchant for aluminium materials is Barker's method of electrolytic etching with subsequent optical microstructural contrasting in polarized light. |
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| Despite final polishing with an oxide suspension, the specimens are still not completely deformationfree and thus unsuitable for use with this etchant. |
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| If etchant is added on the final stage it should not be too much as it is applied just to speed up the process and solve the deformed layer, not really to achieve the etch effect. |
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| Dry etching. types of alloys the regions in Always use fresh etchant. the vicinity of precipitation are Etching is complete when the surface attacked. |
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| The immediate application of this etchant to specimens of a number of aluminium materials, in particular the wrought alloys, produced, as expected, unsatisfactory results. |
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| Before applying the porcelain primer, phosphoric acid etchant with a cotton pellet should be applied on the base for 60 to 90 seconds. |
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| Penetration of the tissue by the etchant, and hence the resulting depth of etch in the metal surface, was controlled by the degree of swelling of the gelatin. |
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| Most quality work is carried out in etching machines provided with impellers that break up the etchant into a spray and force it against the plate. |
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| This etchant has the advantages of being chemically relatively innocuous and of not attacking intermetallic phases and precipitates, which are often etched away by many well-known etchants. |
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| The disadvantage of this etchant, however, is its exceedingly sensitive reaction with residual deformation layers in the surface of the prepared specimen. |
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| Why compound the issue of high chloride levels from a HASL flux or high sulfate residues from trapped etchant below these components as well? |
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| The patterned polymer films act as local protective barriers during the subsequent etching process where the etchant reacts with the exposed silicon wafer. |
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| The unexposed areas remain resistant to the action of the etchant. |
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| If frosty appearance is not obtained, apply etchant again, rinse and dry. |
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| You apply chlorhexidine directly after you have rinsed off the etchant. |
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