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摘要:本文采用凝膠注模成型工藝制備Al2O3陶瓷,凝膠注模成型工藝是一種新的膠態(tài)成型技術(shù)，該工藝是將陶瓷粉體分散于含有有機(jī)單體和分散劑的水溶液中，制備出低粘度、高固相體積分?jǐn)?shù)的濃懸浮體，在催化劑和引發(fā)劑的作用下，使?jié){料中的有機(jī)單體交聯(lián)聚合成三維網(wǎng)狀結(jié)構(gòu)，反應(yīng)得到的交聯(lián)聚合物是一種彈性的水凝膠，起膠粘陶瓷粉料的作用，從而使?jié){料原位固化成型。然后再進(jìn)行脫模、干燥，即可得到陶瓷坯體。此方法的關(guān)鍵是如何制備高固相體積分?jǐn)?shù)、流動性及分散性良好的漿料。本實驗主要研究通過加入乙二醇后能否提高Al2O3懸浮體系的分散性、改善流變性及使凝膠柱模成型坯體均勻、致密、不易變形等問題。經(jīng)實驗發(fā)現(xiàn)Al2O3懸浮體的粘度隨著固相含量的增加而增加，在凝膠注模成型中，其Al2O3的固相體積分?jǐn)?shù)為35Vol%時，制得的坯體最好，但容易起皮，尺寸大小不易控制。制備陶瓷過程中,在Al2O3粉體漿料里加入適量的乙二醇,能有效克服單體聚合的氧阻聚問題,從而消除陶瓷坯體的表面起皮現(xiàn)象。本文還研究了乙二醇的用量對Al2O3粉體的分散性、漿料的粘度等影響,并初步討論了乙二醇對凝膠化過程中氧阻聚效應(yīng)的抑制作用。通過采用凝膠注模成型法制備Al2O3陶瓷，當(dāng)燒結(jié)溫度為1500℃時得到的陶瓷粒徑分布均勻、密度最大、不易變形。 關(guān)鍵詞：凝膠注模成型；氧化鋁；乙二醇；粘度影響
Abstract:The injection molding preparation by gel Al2O3 ceramics ，Gel mould molding process is a new kind of colloidal forming technology，This process is dispersed in ceramic powders containing organic monomer and dispersant in aqueous solution, the preparation of a low viscosity and high solid volume fraction of concentrated suspension body, in the role of catalyst and initiator, make pulping of organic monomer cross linking clumped into 3d mesh structure, reaction get cross-link polymer is a kind of flexible gel, play the role of adhesive ceramic powder, thus make pulping in situ curing. This method is the key is how to prepare high solid phase volume fraction, liquidity and better dispersion slurry. Classics experiment found the viscosity of alumina suspension body with the solid content increases, the forming of the gel note the volume fraction of Al2O3, its 35Vol %, for the given photo-cell and made the best, but easily peeling, size not easy to control. In the preparation of ceramic process, the Al2O3 powder size addition of suitable amount of glycol, can effectively overcome the oxygen inhibitor monomer polymerization, thus eliminating ceramic given photo-cell and surface peeling phenomenon. This paper also studied the glycol content on the aluminum oxide powder dispersion characteristics, the paste viscosity, etc, and the preliminary discussed the influence of gel electrolyzing process of ethylene glycol oxygen inhibitor effect inhibitory effect. By adopting gel mould Changing preparation alumina ceramic, when the sintering temperature for 1500℃ get ceramic uniform particle size distribution, populated, changeful form. Keywords：Gel mould forming； alumina； glycol；Theological property |
