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通过一对平行电极对45钢试样与渗剂施加交流电场,进行交流电场增强粉末法铝硅共渗。通过分析对比电场增强粉末法铝硅共渗与常规铝硅共渗渗层的厚度、组织、微区成分、相结构及抗氧化性能,研究电场对45钢粉末法铝硅共渗的作用特性。结果表明:交流电场能够显著促进粉末法铝硅共渗,渗层厚度和硅含量随电场强度增加而增加,渗层相结构也发生相应变化,当渗扩温度≥650℃、电场电流≥0.5 A时,富铝相消失;常规工艺700℃共渗4 h的渗层厚度仅约24μm,但在电流为0.7 A的电场作用下,可获得约100μm厚渗层;900℃循环氧化试验表明,电场铝硅共渗试样的抗氧化性能远高于常规铝硅共渗试样。
A pair of parallel electrodes were used to apply an AC electric field to the 45 steel sample and the infiltrant to perform the aluminum-silicon infiltration by the AC electric field-enhanced powder method. The effect of electric field on the microstructure and properties of Al-Si infiltrated by 45 steel powder method was studied by analyzing the contrast electric field to enhance the thickness, microstructure, microstructure, phase structure and oxidation resistance of Al-Si infiltration by powder method and conventional Al-Si infiltrating layer. The results show that the AC electric field can significantly promote the powder SiAl infiltration, the thickness of the diffusion layer and the silicon content increase with the increase of the electric field strength, and the phase structure of the infiltration layer also changes correspondingly. When the infiltration temperature is ≥650 ℃, the electric field current is ≥0.5 A , The Al-rich phase disappears. The thickness of the infiltrated layer is only about 24 μm at 700 ℃ for 4 h. However, an about 100 μm thick layer can be obtained under the electric field of 0.7 A. The cyclic oxidation at 900 ℃ shows that the electric field The anti-oxidation properties of Al-Si samples were much higher than that of the conventional Al-Si samples.