Presentation on theme: "Study the Effect of Wetting between Fly Ash – Aluminum Alloy on Wear Resistance of Composites Presenter Liang Ging. Fan Author Shueiwan H. Juang, Liang."— Presentation transcript:
Study the Effect of Wetting between Fly Ash – Aluminum Alloy on Wear Resistance of Composites Presenter Liang Ging. Fan Author Shueiwan H. Juang, Liang Ging. Fan, Shao Jun. Gu 2014/6/4
2 Fly Ash PropertiesClass FClass C (SiO 2 )+(Al 2 O 3 )+(Fe 2 O 3 ), min, % (SO 3 ), max, %5.0 Moisture Content, max, %3.0 Loss on ignition, max, %6.0 ASTM C618 CNS 3036
2014/6/43 Chemical Reactions
2014/6/44 AluminumFly Ash, ALFA AlCuFeMgMnNiSiSnZn other <1.30< ~12.0 <0.20<1.00 SiO 2 Al 2 O 3 Fe 2 O 3 CaOMgOK2OK2ONa 2 OSO Chemical composition of fly ash wt% Chemical composition of ADC12 Al alloy wt% ) JIS designation, ADC12, was selected as the base metal. Fly ash was gotten from Mailiao power plant (Taiwan) and its density is ranged about 2.0~2.5 (g/cm 3 ).
2014/6/45 SEM Micrographs of Fly ash (a)(b) SEM micrograph showing (a) a complete particle of fly ash and (b) rough surface appeared on some particles.
2014/6/46 Wetting solid liquid SC Spreading Coefficient γ Interfacial Energy Θ contact angle Al matrix porosity fly ash SEM micrograph of ALFA composite.
2014/6/47 Experimental Procedure Pre-treatment of fly ash Mixing with stirring Gravity casting Property Measurement of composite castings Wetting evaluation yes no Start End Matrix metal
2014/6/48 Influence Factors of Fly Ash on Process Particle characteristics D ensity, size, shape and volume fraction Etch cleaning Remove the adsorbed contaminants Pre-heated Degas, de-moisture clean fly ash. untreated
2014/6/49 Optical Micrographs of False ALFA Si Al-Si fly ash cluster Al matrix
2014/6/410 Experiment Design Matrix: Aluminum alloys, ADC 12 Addition: 3wt% Mg into the liquid metal to reduce the surface tension. Fly ash being pickled by sulfuric acid and pre-heated at 700 for a specified period, added into the aluminum melt at 850 with different weight percentage, such as 0wt%, 2wt%, 4wt%, 6wt%, 8wt% and 10wt%, and followed by mechanical stirring with 500 rpm to obtain a well-mixed melt.
2014/6/411 Optical Micrographs of Accepted ALFA Micrograph of ALFA composites formed by gravity casting: (a) a complete particle and (b) uniform distribution of fly ash particles. (a)(b)
2014/6/412 Density Measurements ADC g/cm 3
2014/6/413 Wear Tests Wear behavior of ALFA composites tested using Pin-On-Disc apparatus under a load of 9.8N and 18.6N at a constant sliding velocity of 0.5 m/s and sliding distance is 50 m. Counterpart material used in the wear tests was Cr steel ball with ¼ in. in diameter and HRC 58 in hardness. abrasion tester
2014/6/414 Wear Tests Load 9.8 NLoad 18.6 N
2014/6/415 Conclusions The test results revealed that the density of composites was decreased with increasing fly ash percentage. Wear resistance of composites was improved as increasing fly ash percentage. Pretreatment of fly ash is the key to obtain a successful ALFA composite. In future, the die casting process will be introduced by virtue of runner passive stirring (RPS) to obtain a uniform distribution of fly ash inside metal matrix and a better structure by casting pressure.