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chemical milling

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Image
Published: 01 August 2005
Fig. 12 Titanium domes. Before chemical milling (left) and after chemical milling (right) in an incorrect etchant that caused the dome to undergo brittle fracture More
Image
Published: 01 January 2015
Fig. 13.14 Effect of multistep chemical milling of titanium. A 3 is approximately equal to R 3 ; A 2 and A 1 are less than R 2 and R 1 , respectively, depending on their depths of cut. Overhang is diminished as depth of cut becomes shallower. More
Image
Published: 01 January 2015
Fig. 13.13 Transition zone on chemically milled workpiece, that is, the distance from the edge of a milled step to the point where the thickness of the milled area becomes constant More
Image
Published: 01 December 2000
Fig. 6.1 Cast and hot isostatically pressed alpha-beta titanium alloy (Ti-6222S) F-18 ejector block (after chemical milling, blending, and mill repair) More
Image
Published: 01 December 2000
Fig. 10.5 Summary of machining effects on high-cycle fatigue behavior of Ti-6Al-4V (annealed, 32–34 HRC). EDM, electrical discharge machining; CHM, chemical milled More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480293
EISBN: 978-1-62708-318-8
... Aircraft This condition is eliminated by a chemical etch or chemical mill in a bath consisting of HNO 3 -HF and water (10%HNO 3 -3%HF is commonly used) applied to a scale-free surface before machining. A simple test for alpha case is to draw a sharp scriber over the surface to be machined...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120079
EISBN: 978-1-62708-269-3
... electrochemical machining (ECM), chemical milling (CHM), and laser beam machining (LBM). Titanium once was perceived as a material that is difficult to machine. A broad base of titanium machining knowledge now exists, and manufacturers know that with proper procedures titanium can be fabricated using...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180001
EISBN: 978-1-62708-256-3
... This example shows how scheduling issues—and the tendency for people to cut corners to save time—can contribute to failures. Titanium domes like those in Fig. 12 are frequently reduced in size by a process called chemical milling. The domes are actually a very simple forging produced by back extrusion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230339
EISBN: 978-1-62708-298-3
... of as much as 127 μm (0.005 in.) [ Brush Wellman 1982 ]. Etchants commonly used for chemical milling are: 2%HF-2%HNO 3– 2%HSO 4 [ Brush Wellman 1982 , Hashiguchi 1992 ] Sulfuric acid solutions Nitric/hydrofluoric acid solutions and ammonia bifluoride [ Hashiguchi 1992 ] 15% ammonium...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740213
EISBN: 978-1-62708-308-9
.... Nontraditional Machining Processes Nontraditional machining processes include processes such as electrical discharge machining (EDM), electrochemical machining (ECM), ultrasonic machining (USM), and chemical milling (CM). In these operations, material is removed by a variety of physical mechanisms ( Table 1...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230493
EISBN: 978-1-62708-298-3
..., and melting skull streams. During processing of wrought beryllium-copper alloys, parts are chemically milled (pickled) to improve surface finish. At Brush Wellman, most of the pickling is done in a nitric acid or sulfuric acid-peroxide bath. The spent acid liquor is neutralized with a caustic solution...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110144
EISBN: 978-1-62708-247-1
... lapping, chemical decapsulation, laser ablation, plasma reactive ion etching (RIE), CNC based milling and polishing, or a combination of these coupled with optical or electrical endpoint means. This article discusses the general characteristics, advantages, and disadvantages of each of these techniques...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110379
EISBN: 978-1-62708-247-1
... layers of material in order to locate and identify the area of interest. Several of the top-down delayering techniques include wet chemical etching, dry reactive ion etching, top-down parallel lapping (including chemical-mechanical polishing), ion beam milling and laser delayering techniques...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290009
EISBN: 978-1-62708-319-5
... production routes are mechanical milling, chemical precipitation, electrolytic deposition, and melt atomization. Different production steps are often combined to customize the powder characteristics. For example, metal powders can be reduced from an oxide by heating in hydrogen followed by milling...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.tb.atia.t59340117
EISBN: 978-1-62708-427-7
... or alkali), and chemical treatment to coating with a lacquer, oil, or paint ( Ref 6.6 ). In most cases, a combination of these operations is required to produce a long-lasting surface from a mill finish sheet. Several different chemical treatment options are available, depending upon the desired surface...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120039
EISBN: 978-1-62708-269-3
... in corrosive media. Fig. 6.1 Cast and hot isostatically pressed alpha-beta titanium alloy (Ti-6222S) F-18 ejector block (after chemical milling, blending, and mill repair) Fig. 6.2 Investment-cast titanium components for use in corrosive environments For a while in the 1990s, sporting...
Image
Published: 01 January 2000
Fig. 13 Heavily tuberculated 75 mm (3 in.) outer diameter steel mill water supply line. Source: Nalco Chemical Company More
Image
Published: 01 January 2000
Fig. 19 Carbon steel coupon removed from a rolling mill cooling tank. Note the thick greasy deposits resulting from rolling oils. Removal of the deposits shows the corrosion beneath (see right side of figure). Source: Nalco Chemical Company More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110391
EISBN: 978-1-62708-247-1
..., and ion milling, either in the FIB or in a dedicated ion mill. chemical etchants chemo-mechanical polishing cross-sectioning delineation methods focused ion beam ion milling semiconductor devices Introduction Sample preparation for physical failure analysis has been a challenge since...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110016
EISBN: 978-1-62708-247-1
... the precision decapsulation results. For FBGA packages using Cu bond wires, laser milling is required prior to the chemical decapsulation. Cu wires cannot withstand a long chemical exposure compared to Au wires; therefore, shortening the chemical exposure time is crucial. Laser milling can thin down...