(沈陽師范大學(xué) 化學(xué)與生命科學(xué)學(xué)院，沈陽 110034)
摘 要: 研究四元三相Cu-20Ni-20Cr-5Co合金在700-900℃、0.1MPa純氧氣中的氧化行為以及添加第四組元Co對(duì)三元三相Cu-20Ni-20Cr合金氧化行為的影響。結(jié)果表明：合金為三相混合物，其氧化動(dòng)力學(xué)曲線偏離拋物線規(guī)律，由幾個(gè)線段組成，添加5%Co后合金的氧化速率明顯降低。Cu-20Ni-20Cr-5Co合金表面形成的氧化膜外層主要是由CuO組成，內(nèi)層是合金與氧化物組成的混合內(nèi)氧化區(qū)，最終合金內(nèi)層表面形成一連續(xù)的Cr2O3層，阻止合金的進(jìn)一步氧化。
關(guān)鍵字: Cu-20Ni-20Cr-5Co合金；三相組織；添加組元； 高溫氧化
quaternary three-phase Cu-20Ni-20Cr-5Co alloy
（College of Chemistry and Lift Science, Shenyang Normal University, Shenyang 110034, China）
Abstract:The oxidation of a quaternary three-phase Cu-20Ni-20Cr-5Co alloy formed by adding 5% Co (mole fraction) to Cu-20Ni-20Cr alloy was studied at 700−900 ℃ in 0.1 MPa pure oxygen. The results show that the alloy contains a mixture of three phases, and its kinetic curves deviate considerably from the parabolic rate law and are composed of a few of stages. The oxidation rates become lower evidently after 5% Co is added to Cu-20Ni-20Cr alloy. The Cu-20Ni-20Cr-5Co alloy forms the external scales containing CuO and an inner oxidation region containing a mixture of alloy and oxides. At last, this alloy is able to form a continuous layer of Cr2O3 at the top of the mixed inner region. It prevents this alloy from being oxidized further.
Key words: Cu-Ni-Cr-Co alloy; three-phase morphology; adding component; high temperature oxidation
