發(fā)布時(shí)間：2018-02-04 17:15

  本文關(guān)鍵詞： 碳化硅多孔陶瓷 堇青石 孔徑分布 過濾　出處：《武漢工程大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：目前,地球上工業(yè)的興旺發(fā)達(dá)給人類帶來的污染問題越來越嚴(yán)重。高溫、腐蝕性的廢水和廢氣需要經(jīng)過過濾處理后才能排放,常用的過濾材料為多孔陶瓷。使用多孔陶瓷管過濾最重要的是多孔陶瓷材料,其各項(xiàng)機(jī)械性能和孔隙率、孔徑分布等直接決定了其使用壽命和效果。另外,降低多孔陶瓷的燒結(jié)溫度能相應(yīng)提高經(jīng)濟(jì)效益。本文利用固相燒結(jié)與液相燒結(jié)相結(jié)合的方法制備了堇青石結(jié)合碳化硅多孔陶瓷。從理論角度出發(fā),對(duì)碳化硅顆粒與成型后的堇青石顆粒進(jìn)行模擬,對(duì)兩種顆粒的堆積情況進(jìn)行計(jì)算,縮小實(shí)驗(yàn)范圍。在實(shí)驗(yàn)過程中,通過對(duì)混料方式的改進(jìn),針對(duì)所選原料的特性,采用簡(jiǎn)單的分步加料的方法進(jìn)行混料,使得原料混合在實(shí)際意義上更均勻。采用“埋碳法”進(jìn)行燒結(jié),避免氧化氣氛導(dǎo)致的“高溫氧化”的產(chǎn)生。對(duì)得到的制品進(jìn)行力學(xué)性能、開孔率、孔徑分布情況、微觀形貌和成分分析進(jìn)行系統(tǒng)的研究。以F500粒徑碳化硅顆粒和粒徑為3μm左右的氧化鎂、氧化鋁和二氧化硅為原料,1400℃燒結(jié)并保溫2h后,成功制備出堇青石結(jié)合碳化硅多孔陶瓷材料,所得制品具有良好的耐堿性和一般耐酸性。改變堇青石原料的添加量,分別得到配方1、2、3、4的開孔率為44.87%、46.04%、46.92%和48.14%的制品,其抗折強(qiáng)度分別為33.62MPa、31.34 MPa、30.15 MPa和25.9MPa,孔徑分布集中點(diǎn)大小分別為2.75μm、1.65-1.72μm、1.8μm和2.15-2.35μm,分析后確定配方3為最佳堇青石添加量配方。固定堇青石添加量下,分別以粒徑為F360、F600、F800和F1000的碳化硅為主要原料燒結(jié)制品。配方5、6、7、8開孔率分別為48.7%、48.24%、45.64%和43.32%,抗折強(qiáng)度分別為20.49MPa、27.64MPa、28.37MPa和32.69 MPa,孔徑分布集中點(diǎn)大小分別為2.4μm、1.45μm、1.2μm和1.1μm。制品的開孔率和抗折性能隨碳化硅粒徑變化的規(guī)律明顯,孔徑分布也隨碳化硅粒徑變化而不同。
[Abstract]:At present, the problem of pollution caused by the prosperity of industry on the earth is becoming more and more serious. High temperature, corrosive waste water and waste gas must be filtered before they can be discharged. Porous ceramic is commonly used as filter material. Porous ceramic material is the most important filter material with porous ceramic tube. Its mechanical properties, porosity and pore size distribution directly determine its service life and effect. In this paper cordierite bonded silicon carbide porous ceramics were prepared by solid-phase sintering and liquid-phase sintering. The sic particles and the cordierite particles were simulated and the stacking conditions of the two particles were calculated to reduce the experimental range. In the process of the experiment the mixing method was improved. According to the characteristics of the selected raw materials, a simple step feeding method was used to mix the raw materials, which made the raw materials mix more evenly in the practical sense, and the "carbon burying method" was used for sintering. Avoid the production of "high temperature oxidation" caused by oxidation atmosphere. The mechanical properties, porosity and pore size distribution of the obtained products are carried out. The microstructure and composition analysis were systematically studied. After sintering at 1400 鈩，

本文編號(hào)：1490725