Ceramic coating for high-temperature corrosion protection by laser-CVD processes

Pou, J.; González, P.; García, E.; Fernández, Dolores Vilavedra; Serra, J.; León, B.; Saunders, S. R. J.; Pérez‐Amor, M.

doi:10.1016/0169-4332(94)90433-2

Cited by 15 publications

(5 citation statements)

References 10 publications

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“…The photolytic LCVD process may also be more controllable, since the reaction is less dependent on substrate temperature and geometry. Examples of photolytic applications include mirrors (Yamada et al , 1995) corrosion resistant coatings (Pou et al , 1994) mask repair (Putzer et al , n.d.) and circuit repair (Glass et al , 1996).…”

Section: Introductionmentioning

confidence: 99%

Temperature controlled laser chemical vapor deposition (LCVD) using thermal imaging

Jean

Lackey

Duty

2005

Assembly Automation

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PurposeTo describe the thermal imaging control system used to deposit lines of graphite in a laser chemical vapor deposition (LCVD) system.Design/methodology/approachA thermal imaging‐based control system is applied to the LCVD process to deposit layered carbon lines of uniform height and width. A 100 W CO2 laser focused to a 200 μm diameter spot size is used to provide the heat source for the carbon deposition. A high resolution thermal imaging camera is used to monitor and control the average deposition temperature.FindingsCarbon lines are grown with heights of 250 μm and widths of 170 μm consisting of 20 layers. Laser spot temperatures are in excess of 2,170°C, and the total pressure used is 1 atm with a 75 percent methane concentration and the remainder hydrogen. The length of the lines is 3.3 mm, and the scan speed is 5 mm/min. The volumetric deposition rate is 0.648 mm3/h.Research limitations/implicationsThe temperature process control resulted in uniform geometry at the center of the lines, but it was not as effective at the ends of the lines where the geometry was more complex.Originality/valueIntroduces a control technique for uniform line deposition for the LCVD process, which represents a core building block for complex geometries. The establishment of basic control algorithms will enable LCVD to realize the potential for rapid prototyping of metals and ceramics with sub‐millimeter feature sizes.

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Section: Introductionmentioning

confidence: 99%

Temperature controlled laser chemical vapor deposition (LCVD) using thermal imaging

Jean

Lackey

Duty

2005

Assembly Automation

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“…Work by Bradley et al examined the surface treatment of alumina-based refractories with CO 2 and HPDLs [29,30] and a xenon arc lamp [31], whilst Lawrence and Li [32] studied the laser beam interaction characteristics of the Al 2 O 3 -based refractory considered in this work. 5 …”

Section: Introductionmentioning

confidence: 99%

“…Typically, tailoring of the manufacturing process involves techniques for densification of the refractory material [2]. As for coatings, established technologies using chemical, mechanical and/or thermal methods are employed to apply surface layers [5,6]. However, problems such as residual stress generation, low production rates, coating stability, microcracking and porosity are often attendant with these methods [7,8].…”

Section: Introductionmentioning

confidence: 99%

Surface treatment of an Al2O3-based refractory with CO2 and high power diode lasers for improved mechanical and chemical resistance characteristics

Lawrence

2003

Surface and Coatings Technology

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Within both normal and corrosive (NaOH and HNO 3 ) environmental conditions, the wear rate and wear life characteristics of an Al 2 O 3 -based refractory were greatly enhanced by means of CO 2 and high power diode laser (HPDL) surface treatment. Such improvements are attributed to the fact that after laser treatment, the microstructure of the Al 2 O 3 -based refractory was altered from a porous, randomly ordered structure, to a much more dense and consolidated structure that contained fewer cracks and porosities. What is more, resulting from the different rates of solidification brought about by differences in the wavelengths of the two lasers, dissimilar microstructures were subsequently generated. Indeed, despite the fact that the glaze thickness was less, the wear life of the HPDL treated surface exceeded that of the CO 2 laser treated surface in all the test environments owing to its finer, more densely packed and less cracked microstructure.

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“…The treatment of both bulk ceramic materials [7][8][9][10][11] and ceramic coatings [12][13][14][15] has been reported. The knowledge of how far a laser beam is absorbed by a material's surface is of fundamental interest, since the outcomes of many laser processing procedures are intrinsically influenced by this parameter.…”

Section: Introductionmentioning

confidence: 99%

Determination of the absorption length of CO2, Nd:YAG and high power diode laser radiation for a selected grouting material

Lawrence

Minami

et al. 2002

Applied Surface Science

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The laser beam absorption lengths of CO 2 , Nd:YAG and a high power diode laser (HPDL) radiation for a newly developed SiO 2 /Al 2 O 3 -based tile grout have been determined through the application of Beer-Lambert's law. The findings revealed marked differences in the absorption lengths despite the material having similar beam absorption coefficients for the lasers. The absorption lengths for the SiO 2 /Al 2 O 3 -based tile grout for CO 2 , Nd:YAG and HPDL radiation were calculated as being 232±11 µm, 193±4 µm and 183±8 µm respectively. Moreover, this method of laser beam absorption length determination, which has hitherto been used predominantly with lasers operated in the pulsed mode, is shown to be valid for use with lasers operated in the continuous wave (CW) mode, depending upon the material being treated.

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Ceramic coating for high-temperature corrosion protection by laser-CVD processes

Cited by 15 publications

References 10 publications

Temperature controlled laser chemical vapor deposition (LCVD) using thermal imaging

Temperature controlled laser chemical vapor deposition (LCVD) using thermal imaging

Surface treatment of an Al2O3-based refractory with CO2 and high power diode lasers for improved mechanical and chemical resistance characteristics

Determination of the absorption length of CO2, Nd:YAG and high power diode laser radiation for a selected grouting material

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