Microstructure of Al2O3–SiC nanocomposite ceramic coatings prepared by high velocity oxy–fuel flame spray process

This paper presents a study about polypropylene-pine wood composites, both as filaments and products, coated with aluminum (Al) or copper (Cu), obtained through flame thermal spray process after subjecting the composites to thermal treatments in the second and third step of the study. Results revealed that a previous aluminum layer was needed in order to obtain copper coatings on the composites. The physical and mechanical properties of both metal coated composite filaments were also evaluated and compared with the uncoated composite filaments with and without heat treating these. Consequently, it was observed that the nature of the coating adhesion on the substrates was mechanical, and therefore abrasion blasting of filaments or the use of a higher wood fiber content in the composite improved the Al or Cu adhesion. Also, it was observed that extruded wood fiber/PP filaments should not be cooled in water because pieces might be molded directly once the moisture affects the metal coatings adhesion onto the substrates.

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Influence of Agglomerate Size on the Properties of Al2O3-Al2Cu3 Multiphase Ceramic Coatings

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.336-338.1791 ◽

2007 ◽

Vol 336-338 ◽

pp. 1791-1792

Author(s):

Hai Ping Cui ◽

Jun Yan ◽

Shi Guo Du ◽

Xin Kang Du

Keyword(s):

Mechanical Properties ◽

Size Range ◽

Ceramic Coatings ◽

Reactive System ◽

Flame Spray ◽

Agglomerate Size ◽

Binding Strength

Al2O3-Al2Cu3 multiphase coatings were prepared on the surface of steel by reactive flame spray. The binding strength, microhardness and abrasion quality of the coatings were measured and analyzed. The influence of the agglomerate size on the properties of the coatings was emphatically studied to choose suitable size range for Al-CuO reactive system. The results showed that coatings prepared by using –150∼+250 meshes agglomerates exhibited good mechanical properties.

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Lead-Free Piezoelectric Ceramic Coatings Fabricated by Thermal Spray Process

IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control ◽

10.1109/tuffc.2017.2748154 ◽

2017 ◽

Vol 64 (11) ◽

pp. 1758-1765 ◽

Cited By ~ 7

Author(s):

Kui Yao ◽

Shuting Chen ◽

Kun Guo ◽

Chee Kiang Ivan Tan ◽

Meysam Sharifzadeh Mirshekarloo ◽

...

Keyword(s):

Thermal Spray ◽

Piezoelectric Ceramic ◽

Ceramic Coatings ◽

Lead Free ◽

Thermal Spray Process ◽

Spray Process

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THE EFFECT OF FUEL TO OXYGEN RATIOS ON THE PROPERTIES OF HIGH VELOCITY OXY-FUEL TiO2 NANO-PHOTOCATALYST COATINGS

Modern Physics Letters B ◽

10.1142/s0217984910022263 ◽

2010 ◽

Vol 24 (02) ◽

pp. 247-255 ◽

Cited By ~ 1

Author(s):

MARYAMOSSADAT BOZORGTABAR ◽

MEHDI SALEHI ◽

MOHAMMADREZA RAHIMIPOUR ◽

MOHAMMADREZA JAFARPOUR

Keyword(s):

Electron Microscopy ◽

Crystallite Size ◽

High Velocity ◽

X Ray Diffraction ◽

Thermal Spray Process ◽

Spray Process ◽

Transmission Electron ◽

Hvof Thermal Spray ◽

Coating Morphology ◽

Oxygen Ratio

A liquid fuel high velocity oxy-fuel (HVOF) thermal spray process has been used to deposit TiO 2 photocatalytic coatings utilizing a commercially available anatase/rutile nano-powder as the feedstock. The coatings were characterized in terms of the phases present, its crystallite size and coating morphology by means of X-ray diffraction analysis, scanning electron microscopy and transmission electron microscopy, respectively. The results indicate that the sprayed TiO 2 coatings were composed of both TiO 2 phases, namely anatase and rutile with different phase content and crystallite size. A high anatase content of 80% by volume was achieved at 0.00015 fuel to oxygen ratio with nanostructure coating by grain size smaller than feedstock powder. It is found that fuel to oxygen ratio strongly influenced on temperature and velocity of particles in stream jet consequently on phase transformation of anatase to rutile and their crystallite size and by optimizing the ratio which can promote structural transformation and grain coarsening in coating.

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Surface Wear Improvement of Al-Alloys by Amorphous Iron-Based Flame-Sprayed Coatings

Materials Science Forum ◽

10.4028/www.scientific.net/msf.690.405 ◽

2011 ◽

Vol 690 ◽

pp. 405-408 ◽

Cited By ~ 2

Author(s):

Joel Voyer

Keyword(s):

Wear Resistance ◽

Flame Spraying ◽

Flame Spray ◽

Phase Content ◽

Coating Properties ◽

Amorphous Iron ◽

Spray Process ◽

Spraying Parameters ◽

Iron Based ◽

Sprayed Coatings

Partially amorphous iron-based coatings were produced onto aluminium using a powder flame-spraying process with a commercially available feedstock powder (Nanosteel SHS-7170) obtained from the Nanosteel Company Inc.. Several coating properties such as the microstructure, porosity, phase content, micro-hardness, and wear resistance were evaluated in the as-sprayed condition. As shown by the results obtained, the powder flame iron-based coatings perform relatively well in term of wear resistance in comparison with similar coatings produced using other expensive thermal spray techniques. Furthermore, this study shows that all the coating properties (microstructure, porosity, phase content, hardness and wear performance) depend strongly on the flame spraying parameters used. Finally, this paper demonstrates clearly that the flame-spray process may be used to produce amorphous iron-based coatings having a good wear resistance, and that this process appears to be a suitable inexpensive alternative to plasma or HVOF processes based on the present results.

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