Wear behaviour of plasma-sprayed AlSi/B4C composite coatings

Abstract This paper describes the wear behaviour of AlSi/B 4 C composite coatings with 0–25 wt% B 4 C particles for diesel engine motors. These coatings were successfully fabricated on AlSi substrates using an atmospheric plasma spray technique. The produced samples were characterized by means of an optical microscope, scanning electron microscope and microhardness tester. The obtained results pointed out that an increase of B 4 C particles in AlSi coatings was caused on the rising of the microhardness values and the decrease of the thermal expansion coefficient of the coatings. The friction and wear experiments were performed under dry conditions using a ball-on-dics configuration against WC/Co counter material for different loads. It was concluded that wear resistance of the coatings produced using B 4 C powders is greatly improved compared with the substrate material. The highest wear resistance of the coatings were also determined in the 20% B 4 C coating.

[1]  Toshio Nakamura,et al.  Simulations of Crack Propagation in Porous Materials , 2001 .

[2]  S. Nutt,et al.  Microstructural investigation on B4C/Al-7093 composite , 2001 .

[3]  Li Aiju,et al.  Reactive and dense sintering of reinforced-toughened B4C matrix composites☆ , 2004 .

[4]  U. Kocabicak,et al.  Comparison of the developed thermal stresses in Al2O3–SG, ZrO2–12%Si+Al and ZrO2–SG coating systems subjected to thermal loading , 1999 .

[5]  S. Kang,et al.  Aluminum hybrid composite coatings containing SiC and graphite particles by plasma spraying , 2001 .

[6]  S. Chandra,et al.  Modeling development of residual stresses in thermal spray coatings , 2006 .

[7]  E. Çeli̇k,et al.  Al–Si/B4C composite coatings on Al–Si substrate by plasma spray technique , 2007 .

[8]  E. Liang,et al.  Preparation and characterization of in situ synthesized B4C particulate reinforced nickel composite coatings by laser cladding , 2006 .

[9]  H. Hillebrecht,et al.  Synthesis and crystal structure of Al3BC, the first boridecarbide of aluminium , 1997 .

[10]  B. Kolman,et al.  Study of phase changes in plasma sprayed deposits , 1992 .

[11]  E. Çeli̇k,et al.  Effects of residual stress on thickness and interlayer of thermal barrier ceramic MgO–ZrO2 coatings on Ni and AlSi substrates using finite element method , 2002 .

[12]  Kon-Bae Lee,et al.  Reaction products of Al–Mg/B4C composite fabricated by pressureless infiltration technique , 2001 .

[13]  Peter R. Strutt,et al.  Abrasive wear characteristics of plasma sprayed nanostructured alumina/titania coatings , 2000 .

[14]  Khiam Aik Khor,et al.  Plasma sprayed functionally graded thermal barrier coatings , 1999 .

[15]  J. Matějíček,et al.  In situ measurement of residual stresses and elastic moduli in thermal sprayed coatings: Part 1: apparatus and analysis , 2003 .

[16]  J. Matějíček,et al.  Intrinsic residual stresses in single splats produced by thermal spray processes , 2001 .

[17]  Jean-Pierre Celis,et al.  Velocity effects on the wear, friction and tribochemistry of aluminum MMC sliding against phenolic brake pad , 2004 .

[18]  E. Çeli̇k,et al.  Effects of porosity on thermal loadings of functionally graded Y2O3–ZrO2/NiCoCrAlY coatings , 2002 .