摘要
电解液组成对微弧氧化陶瓷膜的形成具有重要作用。在Na2SiO3-Na2WO4-丙三醇复合电解液体系下，对ZAlSi12Cu2Mg1合金微弧氧化陶瓷膜的形成进行研究，通过改变Na2SiO3的含量，研究了其对微弧氧化的临界起弧电压、稳定氧化时间、陶瓷膜层厚度、膜层生长速率和陶瓷膜层相组成的影响。结果表明：Na2SiO3含量从6g／L到12g／L变化时，膜层厚度从154μm逐渐增加到174μm；稳定氧化时间由27min缩短为18min；膜层生长速率约从5．70μm／min提高到9．67μm／min；但Na2SiO3含量超过12g／L时，膜层厚度却不再增加了；当Na2SiO3含量为14g／L时，膜层厚度为166μm；当Na2SiO3含量为8g／L时，临界起弧正向电压达385V，负向电压达最低值为27V。XRD分析表明：陶瓷膜层中含有莫来石、SiO2、α-Al2O3和γ-Al2O3相，陶瓷膜层的莫来石、Si02、α-Al2O3和γ—Al2O3相含量随电解液Na2SiO3含量变化而变化。
The composition of electrolyte play an important role in the forming of ceramic coatings by microarc oxidation. In this work, the forming of ceramic coatings on the surface of ZAlSi2Cu2Mgl alloy by MAO in a Na2SiO3-Na2WO4-Glycerin compound electrolyte were investigated. The influences of content of Na2SiO3 on arc starting voltages, stable oxidation time, thicknesses of ceramic coatings, rate of ceramic coating formation and phase compositions of ceramic coatings were analyzed respectively.The results show that while content of Na2SiO3 rises from 6 to 12g/L, thickness of coatings increases gradually from 154 to 174μm, stable oxidation time shorten from 27 to 18min, rate of coating formation rapidly grows from 5.70 to 9.67μm/min. But thickness of coating decreases as content of NaESiO3 exceeds 12g/L, thickness of coating descends to 166μm while content of Na2SiO3 is 14g/L. Forward voltage descends to 385V and reverse voltage descends to 27V while content of Na2SiO3 is 8g/L. The result indicated by XRD that the ceramic coatings are composed of Mullite, SiO2,α-Al2O3 and γ-Al2O3 and the content of Mullite, SiO2,α-A12O3 and γ-Al2O3 vary with content of Na2SiO3.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第A10期3756-3758,共3页
Journal of Functional Materials
基金
内蒙古科技攻关资助项目（20040202）
