Electro-spark deposition (ESD) was adopted for preparing high property coatings by depositing WC-8C0 cemented carbide on an spheroidal graphite roll substrate. The microstructure and properties of the coating were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) and ball-disc configuration wear tester. The results show that nanosized particles and amorphous structures prevail in the coating which is metallurgically bonded to the substrate. The microstructures of the transition zone include columnar structure and equiaxed structure. The primary phases of the coating contain W_2C, W_6C_(2.54),Fe_3W_3C, and CO_3W_3C. The results of abrasive test show that the coating has low friction coefficients (μ_(average) = 0.18) and the wear mechanisms are mainly abrasive wear, fatigue wear, and oxidation wear. The maximum microhardness value of the coating is about 17410 N/mm~2. The study reveals that the electro-spark deposition process has better coating quality and the coating has high wear resistance and hardness.
参考文献
| [1] | A.Agarwal;N.B.Dahotre .Synthesis of boride coating on steel using high energy density processes: comparative study of evolution of microstructure[J].Materials Characterization,1999(1):31-44. |
| [2] | Agarwal A.;Dahotre NB. .Pulse electrode deposition of superhard boride coatings on ferrous alloy[J].Surface & Coatings Technology,1998(2/3):242-250. |
| [3] | Galinov I .Investigation of the composition of Ag,Ni and AgNi pseudo-alloy coatings applied by electrospark alloying on a Cu substrate[J].Surface and Coatings Technology,1993,56:131. |
| [4] | Ribalko AV.;Sahin O. .The use of bipolar current pulses in electrospark alloying of metal surfaces[J].Surface & Coatings Technology,2003(2/3):129-135. |
| [5] | Parkansky N.;Rapoport L.;Boxman RL.;Goldsmith S.;Rosenberg Y.;Beilis II. .Electrode erosion and coating properties in pulsed air arc deposition of WC-based hard alloys[J].Surface & Coatings Technology,1998(1/2):130-134. |
| [6] | Staia MH.;Cruz M.;Carrasquero E.;Campillo B.;Perez R. Constantino M.;Sudarshan TS.;Fragiel A. .Characterization and wear behavior of pulsed electrode surfacing coatings[J].Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear,2001(2):1051-1060. |
| [7] | Johnson R.N.Electrospark deposition:principles and applications[A].Florida,USA,2002:87. |
| [8] | Johnson R.N.Principle and application of electro-spark deposition[A].Phoenix,USA,1988:188. |
| [9] | Wang R.J;Qian Y.Y;Liu J .Structural and interfacial analysis of WC92-Co8 coating deposited on titanium alloy by electrospark deposition[J].Application Surface Sinence,2004,228(01):405. |
| [10] | Frangini S.;Masci A.;Di Bartolomeo A. .Cr7C3-based cermet coating deposited on stainless steel by electrospark process: structural characteristics and corrosion behavior[J].Surface & Coatings Technology,2002(2/3):279-286. |
| [11] | Kurz W;Fisher D.J.Fundamentals of Solidification[M].Trans Tech Publications Ltd,Uetikon-Zuerich,Switzerland,1998:87. |
| [12] | Li J.C.Electrodeposition of Al-Mn amorphous alloy[J].Transactions of Nonferrous Metals Society of China,1997(07):172. |
| [13] | Qiao S.R;Han D .Spark discharge quenching on steel surface[J].Materials for Mechanical Engineering,2004,23:7. |
| [14] | Wang Y;Yang Y;Tian W;Li C.G .Thermal sprayed WC-Co coatings and their mechanical properties[J].Rare Metals,2007,26:80. |
| [15] | Huang S.W;Samandi M;Brandt M .Abrasive wear performance and microstructure of laser clad WC/Ni layers[J].Wear,2004,256:1105. |
| [16] | 花银群,陈瑞芳,杨继昌,张永康,李长生,路淼.激光淬火和冲击复合强化处理40Cr钢的耐磨性能研究[J].摩擦学学报,2003(05):448-450. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%