粉末冶金材料科学与工程
粉末冶金材料科學與工程
분말야금재료과학여공정
POWDER METALLURGY MATERIALS SCIENCE AND ENGINEERING
2014年
2期
293-301
,共9页
许继芳%盛敏奇%万康%张捷宇%刘恭源
許繼芳%盛敏奇%萬康%張捷宇%劉恭源
허계방%성민기%만강%장첩우%류공원
Mo-ZrO2金属陶瓷%钢液%熔渣侵蚀%断口形貌%烧结工艺
Mo-ZrO2金屬陶瓷%鋼液%鎔渣侵蝕%斷口形貌%燒結工藝
Mo-ZrO2금속도자%강액%용사침식%단구형모%소결공예
Mo-ZrO2 cermet%molten steel%slag corrosion%microstructure%sintering
以钼粉及氧化锆粉为原料,采用不同的烧结工艺参数,在常压氩气气氛下烧结制备50%Mo-ZrO2金属陶瓷。采用四电极法测量该金属陶瓷的高温电导率,在1580℃下进行钢液和碱性熔渣侵蚀实验。结果表明:在烧结温度为1600~1650℃,保温时间为2~4 h的条件下,随保温时间延长或烧结温度升高,烧结体更加致密,孔隙率下降;因而金属陶瓷的电导率提高,耐钢液和熔渣侵蚀性增强;在1600℃、保温4 h条件下烧结的试样密度最大(6.49 g/cm3),高温电导率最高(1600℃下的电导率为101 S/cm),耐钢液和熔渣侵蚀能力最强。钢液对金属陶瓷的侵蚀主要为Fe和Mo的相互溶蚀,熔渣对金属陶瓷的侵蚀主要作用于ZrO2陶瓷相,熔渣中的Al2O3取代金属陶瓷中的ZrO2。熔渣侵蚀过程中,CaO与金属陶瓷中的ZrO2发生反应生成高熔点CaZrO3相,阻止熔渣对金属陶瓷的进一步侵蚀。
以鉬粉及氧化鋯粉為原料,採用不同的燒結工藝參數,在常壓氬氣氣氛下燒結製備50%Mo-ZrO2金屬陶瓷。採用四電極法測量該金屬陶瓷的高溫電導率,在1580℃下進行鋼液和堿性鎔渣侵蝕實驗。結果錶明:在燒結溫度為1600~1650℃,保溫時間為2~4 h的條件下,隨保溫時間延長或燒結溫度升高,燒結體更加緻密,孔隙率下降;因而金屬陶瓷的電導率提高,耐鋼液和鎔渣侵蝕性增彊;在1600℃、保溫4 h條件下燒結的試樣密度最大(6.49 g/cm3),高溫電導率最高(1600℃下的電導率為101 S/cm),耐鋼液和鎔渣侵蝕能力最彊。鋼液對金屬陶瓷的侵蝕主要為Fe和Mo的相互溶蝕,鎔渣對金屬陶瓷的侵蝕主要作用于ZrO2陶瓷相,鎔渣中的Al2O3取代金屬陶瓷中的ZrO2。鎔渣侵蝕過程中,CaO與金屬陶瓷中的ZrO2髮生反應生成高鎔點CaZrO3相,阻止鎔渣對金屬陶瓷的進一步侵蝕。
이목분급양화고분위원료,채용불동적소결공예삼수,재상압아기기분하소결제비50%Mo-ZrO2금속도자。채용사전겁법측량해금속도자적고온전도솔,재1580℃하진행강액화감성용사침식실험。결과표명:재소결온도위1600~1650℃,보온시간위2~4 h적조건하,수보온시간연장혹소결온도승고,소결체경가치밀,공극솔하강;인이금속도자적전도솔제고,내강액화용사침식성증강;재1600℃、보온4 h조건하소결적시양밀도최대(6.49 g/cm3),고온전도솔최고(1600℃하적전도솔위101 S/cm),내강액화용사침식능력최강。강액대금속도자적침식주요위Fe화Mo적상호용식,용사대금속도자적침식주요작용우ZrO2도자상,용사중적Al2O3취대금속도자중적ZrO2。용사침식과정중,CaO여금속도자중적ZrO2발생반응생성고용점CaZrO3상,조지용사대금속도자적진일보침식。
50%Mo-ZrO2 cermet was prepared using Mo powder and ZrO2 powder as raw materials under the condition of aragon protection with different sintering process parameters. Electrical conductivity properties of 50%Mo-ZrO2 samples at high temperature were measured using four-electrode method. The sample was corroded by molten steel and basic slag at 1 580 ℃ respectively. The results indicate that while the sintering temperature is varied from 1 600℃to 1 650℃, and hold for 2 h to 4 h, increasing sintering time or enhancing the sintering temperature leads the density of cement increase and the high-temperature electrical conductivity decrease, and thus enhances the corrosion resistance of the samples against molten steel and slag. When the sample is sintered at 1 600 ℃ and hold for 4 h , there is the a maximum density of 6.49 g/cm3 approximately and the maximum high-temperature electrical conductivity value approximately 101 S/cm, respectively, and the sample has the best corrosion resistance to molten steel and molten slag as well. The main role of the molten steel corrosion is the dissolution between Fe and Mo, the main role of the basic slag is the reaction between ZrO2 phase and slag component, and the Al2O3 in slag takes a part in replacing the ZrO2 ceramic phase in the samples. Besides, CaO in slag reacts with ZrO2 in the samples to generate the phase of CaZrO3, which can prevent samples from further corroding by slag.