http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Effect of nano-CeO<sub>2</sub> on cobalt-based alloy laser coatings
Li, Mingxi,Zhang, Shihong,Li, Huisheng,He, Yizhu,Yoon, Jae-Hong,Cho, Tong-Yul Elsevier 2008 Journal of materials processing technology Vol. No.
<P><B>Abstract</B></P><P>Cobalt-based alloy coatings with/without nano-CeO<SUB>2</SUB> addition prepared by a 5kW CO<SUB>2</SUB> laser on Q235 low carbon steel were introduced. The effects of nanoparticles on the macro-quality, microstructure, phase composition, and wear resistance of the coatings were investigated. The microstructure and phases composition of the coatings were analyzed using Olympus-Pme-3 type microscope, Philip Xl 30 type scanning electron microscope and XD-3A type X-ray diffractometer (XRD). The wear resistance was tested using MM-200 type sliding wear machine, and the wear mechanism was analyzed by JSM-35C type scanning electron microscope (SEM). The results showed that defect (such as crack, gas hole, etc.) -free coatings were obtained. There existed γ-Co and Cr<SUB>23</SUB>C<SUB>6</SUB> in cobalt-based alloy coatings. Another two phases of CeCo<SUB>2</SUB> and ϵ-Co were identified with nanoparticles addition. Fine microstructure and equiaxed dendrite were obtained by adding nano-CeO<SUB>2</SUB>. The relative wear resistance is improved with the increased amount of nano-CeO<SUB>2</SUB>, and the coatings with the best wear resistance when laser power was 2.0kW by adding 1.5wt.% CeO<SUB>2</SUB>. The mechanism was found from abrasive/adhesive wear to fretting wear. The wear resistance decreased with 2.0wt.% CeO<SUB>2</SUB> addition.</P>