While the coatings' heat treatment had a positive effect on the coefficient of friction, the abrasive and adhesive wear resistance of annealed coating was lower compared to as-sprayed coating. Co-Cr-W HVOF-sprayed protective coatings are used for their high oxidation and wear resistance.
Effect of Particle State on the Adhesive Strength of HVOF However, when solid-liquid two-phase droplets impact on a substrate as in HVOF process, the effect of spray materials becomes significant. WC-Co coatings with excellent adhesive strength over 70
Sep 19, 2005 · Effect of Spraying Conditions on Deposition Efficiency. Deposition efficiency is defined as the ratio of the coating weight to the weight of total feedstock. Figure 3 shows the variation of deposition efficiencies of TiO 2 powders with the spraying power (Figure 3a) and the spraying distance (Figure 3b). The results reveal that the deposition efficiency of TiO 2 coatings depend on the two
Effect of critical plasma spray parameter on complex Jan 01, 2013 · The porosity and adhesive strength of coatings also exhibit strong dependency on the CPSP. The porosity decreases as the CPSP is increased. The porosity value decrease to 76.8% for increasing of CPSP from 0.67 to 1.67. In additional, adhesive strength tends to increase from 5.2 MPa to 12.9 MPa as the CPSP increases from 0.67 to 1.67. The coatings are formed by spreading of melted
Effect of heat treatment on microstructure and mechanical Sep 05, 2008 · In this study, the effect of post-spray heat treatment on the microstructure, microhardness, and adhesive strength of the cold-sprayed Ti coating was investigated. It was found that a thick and relatively porous Ti coating was deposited by cold spraying. The coating surface layer presented a more porous structure. The microhardness of the as-sprayed Ti coating was slightly
The objective of this work was to evaluate the influence of moisture on the microstructure of inulin powder, obtained from spray drying an inulin concentrate extract from chicory roots.
Effect of particle state on the adhesive strength of HVOF Dec 01, 2002 · The adhesive strength of the coating was estimated according to the American Society for Testing and Materials (ASTM) C633-79. The melting state of the spray droplet was examined from the coating microstructure. It was found that the melting state of spray particles had a significant effect on the adhesive strength of HVOF sprayed Ni-based coatings.
Effects of droplet thermal state on deposit microstructure All riehts reserved 1359-6462/96-$12.00 + .OO 0956-716X(95)00583-8 EFFECTS OF DROPLET THERMAL STATE ON DEFOSIT MICROSTRUCTURE IN SPRAY FORMING Chen-An Chen, Paul Acquaviva, Jung-Hoon Chun and Teiichi Ando* Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, Cambridge, MA 02 139 *Department of Mechanical
Inconel 718 was cold spray formed to a 6-mm thickness on an 8-cm diameter aluminum alloy tube using Sulzer Amdry 1718 powder and the Plasma Giken PCS-1000 cold spray system. The effects of spray
Microstructure, Tensile Adhesion Strength and Thermal The other TBC systems due to the lower conductivity and diffusivity of bonding layers could decrease the adverse thermal effect on the polymer substrate during top coat deposition and exhibited adhesive bond coat/substrate interfaces. The tensile adhesion test showed that the adhesion strength of the coatings to the substrate is inversely
Splat microstructure of plasma sprayed cast iron with Achieving a plasma sprayed cast iron coating containing graphite requires stringent control on spray parameters that synergistically influence the coating properties and thus the performance. The microstructure of cast iron splats greatly depends on spray parameters such as substrate temperature, chamber pressure, and spray distance. This paper presents the effect of chamber pressure on the
Effect of thermal spray processes on microstructures and properties of Ni-20%Cr coatings Songklanakarin J. Sci. Technol., 2006, 28(3) :677-686 Ni-20%Cr coatings were produced using different thermal spray techniques, which were spray and fuse, flame spray and arc spray. The Ni-20%Cr powder was sprayed onto a mild steel substrate using the