
	Where results make sense

Topic: Chemical etching

In the News (Fri 18 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Etching - Wikipedia, the free encyclopedia
		Etching is an intaglio method of printmaking in which the image is incised into the surface of a metal plate using an acid.
		Etching is also used in the manufacturing of printed circuit boards and semiconductor devices and the preparation of metallic specimens for microscopic observation.
		Zinc is also used, because as a softer metal, etching times are shorter; however, that softness also leads to faster degradation of the image in the press.
	en.wikipedia.org /wiki/Etching (818 words)

	Chemical etch monitor for measuring film etching uniformity during a chemical etching process - Patent 5573624
		The etch station of claim 7, wherein the monitoring means comprises the impedance monitor and further wherein the particular change in the electrical characteristic comprises a particular change in a component of impedance, wherein said component is selected from the group consisting of admittance, reactance, resistance, capacitance, and inductance.
		Etch rates, etch times, and etch end points are difficult to consistently predict due to lot-to-lot variations in film thickness and constitution, as well as etch bath temperature, flow, and concentration variability.
		Monitoring of the particular etching characteristic is effected by electrically sensing, in-situ, changes in an electrical characteristic of the wafer, such as, the impedance or an element or elements of impedance (e.g., admittance, capacitance, inductance, reactance and/or resistance), between the two electrodes 12.
	www.freepatentsonline.com /5573624.html (3725 words)

	Metal Etching - Metal Etching Services > Metal Acid Etching, Metal Chemical Etching Services (Site not responding. Last check: 2007-10-23)
		Photo chemical etching, which is the most common etching method, is a low-cost process that provides high quality, fast turnaround and precision accuracy unavailable in other etching processes.
		Abrasive etching is the process of using controlled, high-pressure compressed air to direct an abrasive, such as sand or aluminum oxide, at the surface of a material to create the etched effect.
		Photo etching, the most common metal etching process and otherwise referred to as “metal chemical etching,” “chemical milling,” “photochemical etching,” “chemical etching” or "photochemical machining," is the process in which a desired image is etched on the surface of the metal part via a photosensitive template.
	www.iqsdirectory.com /metal-etching (1530 words)

	Wet etching - Wikipedia, the free encyclopedia
		Wet etching is the removal of material by immersing the wafer in a liquid bath of chemical etchant.
		In silicon, a popular anisotropic wet etch substrate, the initial (0 degree) surface is called 100 and etches a hundred times faster than the 110 (45 degree) and 111 (54 degree) surfaces.
		The etch pit density is a measure for the number of dislocations per area.
	en.wikipedia.org /wiki/Wet_chemical_etching (265 words)

	Spontaneous Etching 2 (Plasma Etch Fundamentals)
		Chemical or so-called “spontaneous” etching is the result of the interaction of reactive free radicals with the surface.
		A classical example of a chemical reaction which is relevant for plasma etching is the reaction of XeF2 with silicon.
		This was the proof for the concept of ion enhanced chemical etching which is the foundation of plasma etching.
	www.clarycon.com /spontaneousetcha.html (440 words)

	Semiconductors: Silicon: Device Fabrication: Etching
		Wet Chemical Etching: Wet etching is accomplished by submersion of the wafer in an acid bath.
		Physical Bombardment: Physical etching processes are similar to sandblasting; argon gas atoms are used to physically bombard the layer to be etched, and a vacuum pump system is used to remove dislocated material.
		The wafer to be etched is attached to a negative electrode, or "target," in a glow-discharge circuit.
	www.osha.gov /SLTC/semiconductors/devicefab/etching.html (688 words)

	Qualitetch UK - Chemical Etching
		One of the key strengths of the etching process is that the chemistry is unaware of the hardness (or type) of material that it is etching through.
		The ratio of etch depth to undercut is called etch factor and is determined by the process chemistry and the spray pressure and direction of its application.
		The differential etch rates at the floor and sides of the spray etch cavity are responsible for the characteristic profile of the finished edge.
	www.qualitetch.co.uk /chemical_etching.asp (517 words)

	Photolithography - Wikipedia, the free encyclopedia
		A layer of photoresist -- a chemical that hardens when exposed to light (often ultraviolet) -- is applied on top of the metal layer.
		Finally, the hardened photoresist is etched using a different chemical treatment, and all that remains is a layer of metal in the same shape as the mask (or the inverse if negative resist has been used).
		The resulting wafer is then "hardbaked" on a bake plate at high temperature in order to solidify the remaining photoresist, to better serve as a protecting layer in future ion implantation, wet chemical etching, or plasma etching.
	en.wikipedia.org /wiki/Photolithography (1716 words)

	Photoelectrochemical etching of semiconductors
		However, because of the complexity of the reactions, the sequence of chemical and electrochemical reactions is often treated as a pseudo-first-order reaction in which the rate is directly proportional to Kp(x = 0), where K is the pseudo-first-order rate constant and p(x = 0) is the hole concentration at the semiconductor- solution interface [9].
		In summary, the PEC etching of semiconductors is a chemical process initiated by the photogeneration of minority carriers within the semiconductor.
		Thus, it is possible to etch silicon with oxide present, or to use silicon dioxide as an etch mask for PEC etching.
	www.research.ibm.com /journal/rd/425/kohl.html (4762 words)

	Professional Glass Consultants: What is glass etching?
		Disadvantages of the process are that the etch produced by the chemical is not as strong or as bright and white as the blasted finish.
		So using chemical etching is much more limited than blasting, but it can get you started doing small surface etchings right now, at a very low expense.
		To use the etching creme, simply prepare a design the same way you would for abrasive blasting, then apply the creme according to the manufacturer’s instructions, clean it off after the prescribed amount of time and you are finished.
	www.etchmaster.com /information_site/is_chemical.htm (522 words)

	TRG Porous Silicon Project
		Silicon, when anodized electrochemically or chemically in an HF-containing electrolyte, is etched in a manner which produces a sponge-like porous layer of silicon with pore dimensions that range from several microns in width to only a few nanometers.
		Of central importance is a series of experiments involving the photoinduced chemical etching of porous silicon.
		While in electrochemically etched material these emitters are uniformly distributed across the material, in the chemical etching system they can be locally less dispersed, so that regions which emit yellow are separate from those which emit orange or red.
	www.chembio.uoguelph.ca /thomas/posi_research.html (890 words)

	Chemical Etching (Site not responding. Last check: 2007-10-23)
		As the etching process works more efficiently if the bath is gently agitated, the lid prevents the etchant from splashing out (this stuff is pretty nasty), and keeps the blanks from contacting each other while they are in the bath.
		Once a suitable etch has been achieved, the process can be stopped by rinsing the parts in water.
		I etched casting numbers (to the right of the white styrene block) and a step at the left end.
	ipmslondon.tripod.com /modelingarticles/id2.html (1222 words)

	Photo Chemical Machining Terms, Etching, And Engineering Terminology Glossary
		Designing artwork using this photochemical machining method for the chemical machined part whereby all shapes are outlined with a controlled line width to be etched vs. non-outlining with the results being non-controlled etched areas.
		Etched depth to the lateral etch ratio, or etching undercut.
		Etching at unequal rates involving limited areas frequently from In-homogeneities in the work piece, hot spots from unequal heat transfer or, on a micro scale, selected grain faces or constituents.
	www.e-fab.com /p39.htm (3446 words)

	Chemical Milling & Etching by Mech-Chem Associates, Inc.
		The chemical milling and acid etching systems are appropriately designed and installed to handle the corrosive environment created by the acids and chemicals, as well as accommodating the production, process, operating and product quality requirements of the client.
		The tanks were enveloped in a spill containment dike for containment of a potential chemical spill with spill detection and alarm.
		This acid pickling and chemical milling facility consisted of the process system, process tanks, heating and cooling system, and solution agitation as well as the ventilation and fume control system, wastewater neutralization, secondary containment, and safety and alarm systems.
	www.mech-chem.com /chemicalmillingetching/chemicalmillingetching.htm (943 words)

	29401. Chemical etching electrolyte [Egypt]
		What is the chemical analysis of the electrolyte used for printing on Stainless Steel DIN no 17443 material no. 1.4441 and DIN 17440 for instruments (using chemical etching process)which should conduct electrical current and could it be from natural salts please advise.
		There is chemical etching and there is electrochemical etching.
		Chemical etching of stainless steel is difficult and requires the strongest combination of several harsh and highly toxic acids.
	www.finishing.com /294/01.shtml (134 words)

	MBF - chemical machining and photo etched - the engraving
		Chemical machining in brass, nickel silver, bronze, copper beryllium, aluminium, steel and special alloys.
		The method of photo etching, or chemical machining on plate, is a sophisticated system for engraving little pieces, usually complicated, with minimal
		Deriving from an ancient system that is still being used today in the graphical arts, it has spread in the last years due to its increasing quality and to the constant improvement of the planning and control services, raising the value of the engraved and allowing frequently solutions that were never thought of before.
	www.sigrav.com /english/pg11.htm (114 words)

	Chemical Etching, Chemical Etching Metal - Ostling Technologies (Site not responding. Last check: 2007-10-23)
		chemical etching process where the image on a stencil is transferred to an electrically conductive product by the action of electrolyte and electricity.
		Chemical etching metal is widely used for cutlery, tools, medical instruments, sanitary hardware, ball bearings, and many other products.
		chemical etching manufacturer in marking solutions providing you with a low cost entry into the world of permanent chemical etching.
	www.permanentmarking.com /chemical-etching (472 words)

	Chemical Etching Precision Metal Parts - Chemical Milling & Machining from Fotofab
		You need custom-made precision metal parts - chemical etching, metal stamping, RF shielding, or any custom part made out of metal.
		We've been in the chemical etching and metal stamping business for years, so we know how to make your custom part quickly, accurately, and affordably… so you can get on with your business.
		Through chemical etching and metal stamping we produce typical applications such as RF/EMI shields, screens, contacts, connector housings, lead frames, apertures and many more.
	www.fotofab.com (550 words)

	Chemical Etching of Molybdenum Trioxide: A New Tailor-Made Synthesis of MoO3 Catalysts (Site not responding. Last check: 2007-10-23)
		Chemical Etching of Molybdenum Trioxide: A New Tailor-Made Synthesis of MoO3 Catalysts
		Chemical Etching of Molybdenum Trioxide: A New Tailor-Made Synthesis of MoO
		and etching mechanisms have been studied on the basis of the surface morphological evolution of etching patterns of the catalysts.
	pubs.acs.org /cgi-bin/abstract.cgi/inocaj/1998/37/i08/abs/ic971269v.html (205 words)

	Design Guide To Photo Chemical Etching - Photofabrication Engineering Inc.
		When you are designing or specifying photo etched or chemically machined parts, there are certain guidelines which will help expedite the job.
		Because of the nature of the etching process and the inherent undercutting at the edges of the resist pattern on the surface, all dimensions, tolerances and configurations are a function of the thickness of the stock being etched, the material itself and, to a lesser extent, the process variables.
		As a general rule, when etching from two sides, the bevel (B) is approximately 10% of the metal thickness.
	www.photofabrication.com /design.php?PHPSESSID=d119d1718d495996757ac515d31b68a1 (560 words)

	An Metal Etching Informational Page, About Metal Etching and Metal Acid Etching.
		Other metals can be etched using gas or electric-based processes.
		Abrasive etching with high-compression air is another option.
		Photo etching, the most common metal etching process and otherwise referred to as “metal chemical etching,” “chemical milling,”; “photochemical etching,” “chemical etching” or "photochemical machining," is the process in which a desired image is etched on the surface of the metal part via a photosensitive template.
	www.iqsdirectory.com /info/metal-etching (706 words)

	Photo Chemical Machining, Milling, Photo-Etching - E-FAB
		Technology terms defined: Photo Chemical Machining (PCM), photo etching, and chemical milling involves the exact removal of material from a thin metal sheet by various processes.
		The photo chemical machining and milling processes can precisely etch lines and spaces on all types of metals (alloys: kovar, nickel, brass, beryllium, copper, stainless steel, aluminum, and others) with detailed accuracies.
		Utilizing photo chemical machining, photo etching, chemical milling, and CNC micro fabrication techniques for close tolerance manufacturing procedures have many possibilities in producing a wide variety of precision parts and components.
	www.e-fab.com (408 words)

	etching - Art collections - find the art you desire.
		dbanks - Dry etching - Microengineering Intro The most common form of dry etching for micromachining applications is reactive Ions are accelerated towards the material to be etched, and the etching BYU Cleanroom - Selective Chemical / Wet Etching Recipes of Metals Chemical Etching - Metals and Semiconductors.
		Specific etches of certain ArtLex on Etching Etching defined, techniques, with images of examples from art history, and links to other resources.bellange map This is achieved by lightly and repeatedly stabbing the grounded etching plate with an etching Bellange combined stippling and normal line etching.
		Etching prints artshop Etching prints twentieth century and contemporary art.bellange map This is achieved by lightly and repeatedly stabbing the grounded etching plate with an etching Bellange combined stippling and normal line etching.
	www.artworksnj.org /art/etching.html (595 words)

	JCE 1998 (75) 840 [Jul] Chemical Etching of Group III - V Semiconductors
		Chemical etching is basically a process used to selectively remove controlled amounts of material from the original substrate.
		The etch depth can be designed to be just tens of angstroms or up to a few hundred angstroms.
		The etching process is one of the important stages in the fabrication of micro electronics devices.
	jchemed.chem.wisc.edu /Journal/Issues/1998/jul/abs840.html (316 words)

	Laser-Enhanced Chemical Etching of Solid Surfaces
		Detailed measurements of the etch rates as functions of the laser frequency, the laser intensity, and the gas pressure have been performed for some of the gas-solid systems.
		The enhanced surface reactions have been classified into three categories: those activated by the vibrational excitation of the etchant molecules, those with radicals generated by photodissociation, and those induced by laser excitation of solid substrates.
		Achievable etch rates and spatial resolutions for the various reaction mechanisms are also examined.
	domino.research.ibm.com /tchjr/journalindex.nsf/f556e7f920289a74852565450065410b/9991fc0f66af5faf85256bfa0067f515?OpenDocument (123 words)

	CHEMICAL-ETCHING PROCESSOR - Job Description
		Etches specified portions of metal parts and materials used in manufacturing aircraft, using immersion equipment, templates, handtools, and precision measuring instruments: Reads work order, blueprints, and process specifications to determine location of etch, finished dimensions, and method and sequence of operations.
		Applies maskant to surfaces to be etched, scribes etch lines, using template, and removes maskant from etch areas.
		May immerse parts and materials in successive baths and rinses to perform surface processing in addition to etching, such as pickling, chromodizing, passivating, degreasing, and stripping, and be designated Process Equipment Operator (aircraft mfg.).
	careerplanner.com /DOT-Job-Descriptions/CHEMICAL-ETCHING-PROCESSOR.cfm (187 words)

Try your search on: Qwika (all wikis)