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2. Etching (microfabrication) - Wikipedia

   en.wikipedia.org/wiki/Etching_(microfabrication)

   Etching is a critically important process module in fabrication, and every wafer undergoes many etching steps before it is complete. For many etch steps, part of the wafer is protected from the etchant by a "masking" material which resists etching. In some cases, the masking material is a photoresist which has been patterned using photolithography.

3. Alkali–silica reaction - Wikipedia

   en.wikipedia.org/wiki/Alkali–silica_reaction

   ASTM C1293: "Test Method for Concrete Aggregates by Determination of Length Change of Concrete Due to Alkali-Silica Reaction". It is a long-term confirmation test (1 or 2 years) at 38 °C in a water-saturated moist atmosphere (inside a thermostated oven) with concrete prisms containing the aggregates to be characterised mixed with a high-alkali ...

4. The $10 DIY Hack For Fixing Concrete That Will Save You the ...

   www.aol.com/lifestyle/10-diy-hack-fixing...

   We have an 8-step guide to repair your concrete steps like a pro and skip the handyman. Skip to main content. Lifestyle. 24/7 help. For premium support please call: 800-290-4726 more ways to ...

5. Surface micromachining - Wikipedia

   en.wikipedia.org/wiki/Surface_micromachining

   Micro-machining starts with a silicon wafer or other substrate upon which new layers are grown. These layers are selectively etched by photo-lithography; either a wet etch involving an acid, or a dry etch involving an ionized gas (or plasma). Dry etching can combine chemical etching with physical etching or ion bombardment. Surface micro ...

6. Etching - Wikipedia

   en.wikipedia.org/wiki/Etching

   ferric chloride may be used for etching copper or zinc plates, whereas nitric acid may be used for etching zinc or steel plates. Typical solutions are 1 part FeCl 3 to 1 part water and 1 part nitric to 3 parts water. The strength of the acid determines the speed of the etching process. The etching process is known as biting (see also spit ...

7. Chemical milling - Wikipedia

   en.wikipedia.org/wiki/Chemical_milling

   Chemical milling or industrial etching is the subtractive manufacturing process of using baths of temperature-regulated etching chemicals to remove material to create an object with the desired shape. [1] [2] Other names for chemical etching include photo etching, chemical etching, photo chemical etching and photochemical machining. It is ...