ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In this work, Al2O3-Al composite coatings with different compositions (Al2O3-5wt.% Al,Al2O3-10wt.% Al and Al2O3-15wt.% Al) were deposited by plasma spraying. The effect of Aladdition on the mechanical properties of coatings was explored in terms of microhardness, fracturetoughness and sliding wear rate. An additional statistical study of Weibull analysis was carried out forfurther investigating the mechanical data variation. The increase in Al addition was realized to showlittle effects to decrease porosity of coatings. With the increase in Al addition, the microhardness ofcoatings decreased from 869 to 742 Hν0.2 along with larger fluctuation in microhardness valuesindicated by lower Weibull modulus (5.7-10), whereas toughness of coatings was improved rangingfrom 2.7 to 4.1 MPa.m1/2. Friction tests showed that the Al additions effectively contribute todecrease the friction coefficient of coatings sliding against steel counterpart. Among variouscoatings, the Al2O3-15wt.% Al coating exhibits lowest friction coefficient but worst wear resistance.This may arise due to its significantly decreased microhardness
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.569.361.pdf
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