论文部分内容阅读
研究了搪瓷涂层对 Ti-24Al-14Nb-3V抗高温氧化及热腐蚀性能的影响结果表明,在 900 ℃下,由于搪瓷涂层具有较高的化学稳定性,且和 Ti-24Al-14Nb-3V有比较接近的热膨胀系数,大大 改善了 Ti-24Al-14Nb-3V抗恒温氧化及循环氧化性能在 850 ℃(Na, K)2SO4中,虽然熔盐中的 Na+与搪瓷涂层中的 Ca2+进行离子交换引起搪瓷涂层少量减重,但它仍具有优异的抗熔融硫酸盐腐蚀 能力在850℃NaCl+Na2SO4中,搪瓷涂层对Ti-24Al-14Nb-3V具有一定的保护作用,但是由 于熔盐中的 Na+与搪瓷涂层中的 Ca2+进行离子交换,和熔盐中的 Cl-对搪瓷涂层的腐蚀作用及对基 材的点蚀作用,使其保护作用下降。
The effects of enamel coating on the high temperature oxidation and hot corrosion resistance of Ti-24Al-14Nb-3V were studied. The results show that the enamel coating has high chemical stability at 900 ℃, 3V has a relatively close coefficient of thermal expansion and greatly improves the anti-oxidation and cyclic oxidation resistance of Ti-24Al-14Nb-3V in 850 ℃ (Na, K) 2SO4. Although Na + in molten salt and Ca 2+ in enamel coating Ion exchange causes a small weight loss of the enamel coating, but it still has excellent resistance to molten sulfate corrosion Enamel coatings have a protective effect on Ti-24Al-14Nb-3V at 850 ° C in NaCl + Na2SO4. However, Of Na + ion exchanged with Ca2 + in the enamel coating, and corrosion of Cl- enamel coating in the molten salt and pitting corrosion on the substrate decreased the protective effect.