摘要
采用显微硬度、XRD、SEM、极化曲线测量、DSC、TG等技术研究了铸造Al-14Si-5Cu-3Ni-1Mg微弧氧化陶瓷层的相组成、形貌、硬度、耐腐蚀性、耐热冲击性和热稳定性。结果表明,该合金微弧氧化陶瓷层由致密层和疏松层组成,致密层主要为α-Al2O3相,疏松层主要为γ-Al2O3及无定型相,微弧氧化陶瓷层硬度(HV)高达2400,合金的耐蚀性显著提高,抗热冲击性和热稳定性良好。
The phase constituent,morphology,hardness,corrosion resistance,thermal-shock resistance and thermal stability of the ceramic coatings produced by micro-arc oxidation on a cast hypereutectic Al-14Si-5Cu-3Ni-1Mg alloy were analyzed by micro-hardness testing,XRD(X-ray diffraction),SEM(scanning electron microscope),the Tafel curves,DSC(differential scanning calorimetry)and TG(thermal-gravity).It is found that the ceramic coating consists of a compact layer composed of α-Al_2O_3 phase and a loose layer composed of γ-Al_2O_3 phase and amorphous phase,which is responsible for the improvement of the corrosion resistance.Meanwhile,the hardness of the ceramic coating reaches HV 2400 with desirable thermal-shock resistance and thermal stability.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2009年第5期471-473,共3页
Special Casting & Nonferrous Alloys
