本文選題：工業(yè)氧化鋁粉 + 物相轉(zhuǎn)變��； 參考：《河南工業(yè)大學(xué)》2017年碩士論文

【摘要】：氧化鋁因具有高強(qiáng)度、抗磨損、耐腐蝕等優(yōu)異的特性,在耐火材料領(lǐng)域有廣泛的應(yīng)用。隨著國(guó)內(nèi)越來越多的生產(chǎn)廠家采用工業(yè)氧化鋁粉來生產(chǎn)煅燒氧化鋁微粉及燒結(jié)板狀剛玉,工業(yè)氧化鋁粉在溫度升高過程中的物相轉(zhuǎn)變和形貌演變不論是對(duì)氧化鋁微粉的生產(chǎn)還是對(duì)燒結(jié)板狀剛玉的生產(chǎn)都是有重要的理論及實(shí)際意義的。因此,本文采用X射線衍射和掃描電子顯微鏡這兩種檢測(cè)手段,對(duì)不同工業(yè)氧化鋁粉(澳粉、山東中鋁粉、山東荏平粉和廣西信發(fā)粉)在不同溫度煅燒后的物相轉(zhuǎn)變和形貌演變進(jìn)行了研究,同時(shí)也對(duì)不同添加劑存在時(shí)不同工業(yè)氧化鋁粉在不同溫度煅燒后的物相轉(zhuǎn)變和形貌演變進(jìn)行了研究,主要研究結(jié)果如下:(1)澳粉、山東中鋁粉、山東荏平粉和廣西信發(fā)粉在加熱過程中物相轉(zhuǎn)化過程和顯微形貌的演變基本一致。經(jīng)700°C、800°C和900°C煅燒后,物相沒有變化,顯微形貌也變化不大。在1000°C煅燒后,物相發(fā)生明顯變化,γ-Al_2O_3和δ-Al_2O_3轉(zhuǎn)變?yōu)棣?Al_2O_3和α-Al_2O_3,工業(yè)氧化鋁粉的顯微形貌開始發(fā)生了明顯的變化,顆粒表面開始出現(xiàn)不規(guī)則形狀的小晶粒,小晶粒之間的晶界很明顯。經(jīng)1100°C煅燒后,大部分θ-Al_2O_3轉(zhuǎn)化為α-Al_2O_3,小晶粒彼此分離形成縫隙。煅燒溫度達(dá)到1200°C后,所有氧化鋁過渡相全部轉(zhuǎn)化為α-Al_2O_3,小晶粒因?yàn)殚L(zhǎng)大,有些彼此又連在了一起。由此可見,工業(yè)氧化鋁粉在700~1200°C煅燒后,顯微形貌演變與物相轉(zhuǎn)變相關(guān)。隨著煅燒溫度從1200°C增加到1600°C,四種工業(yè)氧化鋁粉中的小晶粒彼此分離,小晶粒之間的縫隙逐漸增大,小晶粒逐漸長(zhǎng)大。當(dāng)煅燒溫度達(dá)到1400°C時(shí),晶粒逐漸生長(zhǎng)成小球狀或橢球狀,晶粒進(jìn)一步長(zhǎng)大。當(dāng)煅燒溫度繼續(xù)升高,直至1600℃,球狀和橢球狀小晶粒繼續(xù)長(zhǎng)大,直到晶粒彼此又粘結(jié)在一起。(2)由澳粉、山東中鋁粉和廣西信發(fā)粉三種工業(yè)氧化鋁粉壓制成的圓餅狀的塊樣在1700°C和1800°C煅燒后,觀察其顯微形貌貌可以發(fā)現(xiàn),這三種工業(yè)氧化鋁粉樣品都是由大量的球狀、橢球狀和板片狀晶粒堆積而成的,晶粒與晶粒之間存在大量的孔隙,并沒有燒結(jié)致密化。與各自在1600°C煅燒后樣品的顯微形貌相比,晶粒大小沒有變化。說明當(dāng)煅燒溫度進(jìn)一步升高至1700°C和1800°C,這三種工業(yè)氧化鋁粉中的晶粒并沒有繼續(xù)長(zhǎng)大。(3)NH_4F對(duì)澳粉和廣西信發(fā)粉的物相轉(zhuǎn)變都有一定的促進(jìn)作用,但兩者不同的是,2.0%含量的NH_4F可使澳粉中氧化鋁過渡相全部轉(zhuǎn)化為α-Al_2O_3相的溫度從1200°C降低到900°C,而1.6%含量的NH_4F可使廣西信發(fā)粉中氧化鋁過渡相全部轉(zhuǎn)化為α-Al_2O_3相的溫度從1200°C降低到1000°C。NH_4F對(duì)澳粉和廣西信發(fā)粉的顯微形貌也有一定的影響,NH_4F可以改變澳粉和廣西信發(fā)粉的結(jié)晶習(xí)性,形成板片狀結(jié)構(gòu)。但兩者不同的是,在1200°C煅燒后,2.0%NH_4F含量的澳粉顆粒中的α-Al_2O_3晶粒為圓的板片狀,而2.0%NH_4F含量的廣西信發(fā)粉顆粒中的α-Al_2O_3晶粒為規(guī)則的六方板片狀。隨著煅燒溫度繼續(xù)升高,澳粉和廣西信發(fā)粉中的板片狀α-Al_2O_3晶粒逐漸開始消失,當(dāng)煅燒溫度達(dá)到1400°C時(shí),2.0%NH_4F含量的澳粉顆粒主要由大量的顆粒狀α-Al_2O_3晶粒和少部分的板片狀α-Al_2O_3晶粒堆積而成,而2.0%NH_4F含量的廣西信發(fā)粉顆粒主要由大量顆粒狀α-Al_2O_3晶粒堆積而成,板片狀的α-Al_2O_3晶粒已完全消失。(4)含有H_3BO_3的澳粉和廣西信發(fā)粉在1200°C煅燒后所有的氧化鋁過渡相才完全轉(zhuǎn)化為α-Al_2O_3。H_3BO_3在900°C對(duì)澳粉和廣西信發(fā)粉的物相轉(zhuǎn)變有微弱的促進(jìn)作用,在1000°C和1100°C卻抑制了澳粉和廣西信發(fā)粉中氧化鋁過渡相向α-Al_2O_3的轉(zhuǎn)變。H_3BO_3對(duì)澳粉和廣西信發(fā)粉的顯微形貌也有一定的影響。2.0%H_3BO_3含量的澳粉和廣西信發(fā)粉在完全轉(zhuǎn)化為α-Al_2O_3后,主要形成了蠕蟲狀的顯微結(jié)構(gòu)。而0.8%H_3BO_3含量的澳粉在1200°C煅燒后,澳粉主要由大量的球狀α-Al_2O_3晶粒堆積而成,且α-Al_2O_3晶粒分布相對(duì)分散,隨著煅燒溫度升高至1300°C和1400°C,球狀α-Al_2O_3晶粒彼此相連形成蠕蟲狀結(jié)構(gòu)。而0.8%H_3BO_3含量的廣西信發(fā)粉在1300°C煅燒后,才形成球狀α-Al_2O_3晶粒,且α-Al_2O_3晶粒分布相對(duì)分散,當(dāng)煅燒溫度為1400°C時(shí),球狀α-Al_2O_3晶粒長(zhǎng)大彼此相連也形成了蠕蟲狀結(jié)構(gòu)。
[Abstract]:Alumina has a wide range of applications in the field of refractories because of its excellent properties such as high strength, abrasion resistance and corrosion resistance. With more and more manufacturers in China, the industrial alumina powder is used to produce alumina micro powder and sintered plate like corundum. The phase transformation and morphology evolution of industrial aluminum oxide powder in the process of temperature rise are not matter It is of great theoretical and practical significance to the production of alumina micropowder or to the production of sintered plate corundum. Therefore, this paper uses two kinds of testing methods, X ray diffraction and scanning electron microscope, to calcined the different industrial aluminum oxide powder (Australia powder, Shandong medium aluminum powder, Shandong's Ping powder and Guangxi powder) at different temperatures. Phase transformation and morphology evolution were studied. The phase transformation and morphology evolution of different industrial aluminum oxide powders at different temperatures were also studied. The main results were as follows: (1) the phase transformation process and display of the Australian powder, Shandong medium aluminum powder, Shandong's Ping powder and Guangxi powder in the heating process. The evolution of Micromorphology is basically the same. After calcining of 700 C, 800 C and 900 degree C, the phase change is not changed, and the micromorphology changes little. After calcining at 1000 C, the phase changes obviously, the gamma -Al_2O_3 and delta -Al_2O_3 change to theta -Al_2O_3 and alpha -Al_2O_3. The microstructure of the industrial aluminum oxide powder begins to change obviously, and the surface of the particle begins to come out. The grain boundary between small grains and small grains is obvious. After calcination at 1100 degree C, most of theta -Al_2O_3 is converted to alpha -Al_2O_3, and the small grains separate from each other to form a gap. After the calcination temperature reaches 1200 C, all the alumina transition phases are converted to alpha -Al_2O_3, and the small grains are connected together because of the growth. The microstructure evolution is related to phase transformation after the calcination of industrial aluminum oxide powder at 700~1200 C. As the calcining temperature increases from 1200 to 1600 C, the small grains in the four kinds of industrial aluminum oxide powder are separated from each other, the gap between the small grains increases gradually and the small grain grows gradually. When the calcining temperature reaches 1400 C, the grain grows gradually into small size. Spheroid or ellipsoid, the grain is further grown. When the calcining temperature continues to rise, the spheroidal and ellipsoid small grains continue to grow until 1600 degrees centigrade, until the grain is bonded together. (2) the round cake shaped samples made of Australian powder, Shandong medium aluminum powder and three kinds of industrial alumina powder in Guangxi powder are calcined at 1700 [C] and 1800 degree C. The microstructure appearance can be found that the three kinds of industrial aluminum oxide powder samples are made up of a large number of spheroid, ellipsoid and plate like grains. There is a large number of pores between grain and grain, and no densification is sintered. Compared with the micromorphology of the samples calcined at 1600 C, the size of grain does not change. Further increase to 1700 C and 1800 degree C, the three kinds of industrial aluminum oxide powders do not continue to grow. (3) NH_4F has a certain promotion effect on the phase transition of Australian powder and Guangxi powder, but the difference is that the 2% content of NH_4F can make the transition phase of Al2O3 into alpha -Al_2O_3 phase from 1200 degrees to C. Low to 900 C, and 1.6% content of NH_4F can make the transition of alumina transition phase to alpha -Al_2O_3 phase from 1200 degree C to 1000 degree C.NH_4F to the microstructure of Australian powder and Guangxi powder, and NH_4F can change the crystallization habit of Australian powder and Guangxi powder and form plate like structure. The difference is that after the calcination at 1200 C, the alpha -Al_2O_3 grain in the 2.0%NH_4F content of the Macau particles is round plate, while the alpha -Al_2O_3 grain in the 2.0%NH_4F content of Guangxi powder particles is a regular six square plate. As the calcination temperature continues to rise, the plate like alpha -Al_2O_3 grain in the Macau powder and the Guangxi powder powder gradually begins to disappear. When the calcining temperature reaches 1400 C, the 2.0%NH_4F content of Australia powder particles is mainly composed of a large number of granular alpha -Al_2O_3 grains and a small portion of the plate like alpha -Al_2O_3 grain. The 2.0%NH_4F content of Guangxi powder particles is mainly composed of a large number of granular alpha -Al_2O_3 grains, and the plate like alpha -Al_2O_3 grains have been completely eliminated. (4) all the Al2O3 transition phase in the calcined of Australian powder and Guangxi powder containing H_3BO_3 after 1200 C is completely converted to alpha -Al_2O_3.H_3BO_3 at 900 [C], which has a weak promoting effect on the phase transition of Australian powder and Guangxi's powder, but at 1000 and 1100 degrees, the transition of alumina to alpha -Al_2O_3 in Australian powder and Guangxi's powder is inhibited. The transformation of.H_3BO_3 to Macau powder and the micromorphology of Guangxi powder also has a certain influence on the.2.0%H_3BO_3 content of Macau and Guangxi powder, which mainly formed a vermicular microstructure after converting to alpha -Al_2O_3, and the Macau powder of 0.8%H_3BO_3 content is mainly accumulated by a large number of spheroidal alpha -Al_2O_3 grains after the calcining of 1200 degree C. In addition, the grain distribution of alpha -Al_2O_3 is relatively dispersed. With the calcining temperature rising to 1300 C and 1400 degree C, the spheroidal alpha -Al_2O_3 grains are connected to each other to form a wormlike structure. The 0.8%H_3BO_3 content of Guangxi powder is calcined at 1300 [C], and the spheroidal alpha -Al_2O_3 grain is formed, and the grain distribution of alpha -Al_2O_3 is relatively dispersed, when the calcining temperature is 1400 degrees C. The spherical -Al_2O_3 grains grow together and form worm like structures.

【學(xué)位授予單位】：河南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ133.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 田清波;代金山;呂志杰;;NH_4F含量及煅燒工藝對(duì)氧化鋁相變及α-Al_2O_3微觀形貌的影響[J];人工晶體學(xué)報(bào);2015年12期

2 何捍衛(wèi);王曉;潘登宇;;固相反應(yīng)法制備β″-Al_2O_3粉末的熱力學(xué)研究[J];粉末冶金材料科學(xué)與工程;2015年03期

3 王瑩;;適用多種鋁土礦的氧化鋁溶出新方案[J];有色礦冶;2012年05期

4 羅偉;;棕剛玉生產(chǎn)能耗與節(jié)能分析[J];輕工科技;2012年10期

5 孫海濱;劉婷;趙友誼;;不同礦化劑對(duì)α-Al_2O_3顯微結(jié)構(gòu)的影響[J];陶瓷學(xué)報(bào);2012年02期

6 江元汝;李兆;賈彩霞;趙彬;劉德堯;;片狀氧化鋁粉體的控制合成及表征[J];西安建筑科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2011年05期

7 艾桃桃;馮小明;王曉林;;燒結(jié)板狀剛玉的制備及性能研究[J];無機(jī)鹽工業(yè);2010年10期

8 彭西高;王曉利;吳學(xué)真;孫加林;;氧化鋁基耐火材料的高溫耐磨性[J];北京科技大學(xué)學(xué)報(bào);2010年08期

9 徐愛勤;張正基;;國(guó)內(nèi)氧化鋁的生產(chǎn)及發(fā)展?fàn)顩r[J];氯堿工業(yè);2010年03期

10 康健;王晶;張文波;;AlF_3添加劑對(duì)氧化鋁粉體微觀結(jié)構(gòu)的影響[J];輕金屬;2008年03期

相關(guān)重要報(bào)紙文章 前2條

1 魏巍;;伊蒙公司用氧化鋁廢渣生產(chǎn)高標(biāo)號(hào)水泥[N];中國(guó)建材報(bào);2011年

2 鄭永孝;原瑞芳;;用氧化鋁殘?jiān)a(chǎn)水泥取得初步成功[N];中國(guó)建材報(bào);2007年

相關(guān)博士學(xué)位論文 前1條

1 王建立;超細(xì)氫氧化鋁的制備及提高其熱穩(wěn)定性技術(shù)研究[D];中南大學(xué);2009年

相關(guān)碩士學(xué)位論文 前3條

1 鮑忠正;赤泥基無熟料水泥的制備與應(yīng)用[D];中國(guó)礦業(yè)大學(xué);2016年

2 趙成朋;拜耳法氧化鋁生產(chǎn)裝備大型化[D];東北大學(xué);2014年

3 張李鋒;多孔γ-Al_2O_3粉體的制備研究[D];上海交通大學(xué);2007年

，

本文編號(hào)：1790692