發(fā)布時(shí)間：2018-05-03 02:37

  本文選題：鐵尾礦 + 功能材料��； 參考：《河北工業(yè)大學(xué)》2015年博士論文

【摘要】：遠(yuǎn)紅外功能陶瓷常以過渡金屬氧化物、氧化鋯、石英、堇青石等為主要原料制成,在節(jié)能、人體保健等領(lǐng)域具有廣闊應(yīng)用前景。本工作以鐵尾礦為主要研究對(duì)象,通過優(yōu)化陶瓷的配料體系和燒成制度,制備具有紅外發(fā)射性能的鐵尾礦復(fù)合陶瓷材料,研究其紅外發(fā)射機(jī)制及影響因素,為鐵尾礦資源的高附加值功能化利用探索新途徑。通過鐵尾礦化學(xué)成分的分析,確定鐵尾礦、碳酸鈣、二氧化硅為遠(yuǎn)紅外陶瓷的配方體系,并分別以電氣石和稀土為添加劑進(jìn)一步提高陶瓷的紅外發(fā)射性能。配方中鐵尾礦、碳酸鈣、二氧化硅三者的質(zhì)量比為6:1:1。電氣石復(fù)合鐵尾礦陶瓷的燒結(jié)溫度為1065~1070℃,熔融溫度為1075~1081℃;稀土復(fù)合鐵尾礦陶瓷的燒結(jié)溫度為1062~1070℃,熔融溫度為1065~1075℃。利用熱重-差熱、高溫物性分析方法研究添加劑對(duì)鐵尾礦陶瓷燒結(jié)的影響。隨著電氣石含量的增加,陶瓷的密度由1.68 g/cm3增大到1.96 g/cm3,燒結(jié)溫度由1070℃降低到1065℃。隨著稀土含量的增加,陶瓷的密度由1.65 g/cm3增大到1.79 g/cm3,燒結(jié)溫度由1070℃降低到1062℃。利用Kissinger法計(jì)算得到電氣石復(fù)合鐵尾礦陶瓷中碳酸鹽分解的活化能為209.39~233.37 kJ/mol,陶瓷燒結(jié)的活化能為101.79~174.36 kJ/mol。稀土復(fù)合鐵尾礦陶瓷中碳酸鹽分解的活化能為191.53~223.41 kJ/mol,陶瓷燒結(jié)的活化能為96.880~164.16 kJ/mol。電氣石和稀土有利于加快燒結(jié)反應(yīng)速率,促進(jìn)鐵尾礦陶瓷的燒結(jié)。從晶體微觀結(jié)構(gòu)和化學(xué)鍵振動(dòng)兩方面分析電氣石和稀土促進(jìn)鐵尾礦陶瓷紅外發(fā)射的機(jī)制。隨著電氣石含量的增加,陶瓷的紅外發(fā)射率先增大后減小,添加5 wt.%電氣石時(shí),陶瓷的紅外發(fā)射率最高達(dá)0.925。電氣石晶體結(jié)構(gòu)中的Fe2+通過取代輝石中的Ca2+形成類質(zhì)同象結(jié)構(gòu),增強(qiáng)輝石中Ca-O鍵的振動(dòng),進(jìn)而促進(jìn)鐵尾礦陶瓷紅外發(fā)射率的提高。隨著稀土含量的增加,陶瓷的紅外發(fā)射率同樣呈現(xiàn)先增大后減小的變化趨勢(shì),添加7 wt.%稀土?xí)r,陶瓷的紅外發(fā)射率最高達(dá)0.914。稀土Ce4+通過與鐵透輝石形成間隙固溶體,增強(qiáng)鐵透輝石中八面體處Mg-O鍵和四面體處Fe-O鍵的振動(dòng),進(jìn)而提高陶瓷的紅外發(fā)射性能。
[Abstract]:The far-infrared functional ceramics are usually made from transition metal oxides, zirconia, quartz, cordierite and so on. In this work, the iron tailings composite ceramic materials with infrared emission properties were prepared by optimizing the ceramic batching system and sintering system, and the infrared emission mechanism and influencing factors were studied. To explore a new way for the utilization of high added value function of iron tailings. Based on the analysis of the chemical composition of iron tailings, the formula system of iron tailings, calcium carbonate and silicon dioxide was determined, and the infrared emission properties of the ceramics were further improved by using tourmaline and rare earth as additives, respectively. The mass ratio of iron tailings, calcium carbonate and silica is 6: 1: 1. The sintering temperature and melting temperature of tourmaline composite iron tailings ceramics and rare earth composite iron tailings ceramics are 1065 ~ 1070 鈩，

本文編號(hào)：1836624