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摘要:ZTA 復(fù)合陶瓷的增韌機(jī)理是基體晶粒的細(xì)化、相變韌化、微裂紋增韌、裂紋的轉(zhuǎn)向與分叉，ZrO2存在的從四方到單斜的相變被認(rèn)為是改善陶瓷脆性的有效途徑。由于氧化鋯基氧化鋁復(fù)合陶瓷基板存在流變性弱、脆性較強(qiáng)，陶瓷容易破碎，本文在此基礎(chǔ)上做相應(yīng)改變，即將氧化鋁作為基板用氧化鋯來(lái)增韌，制出硬度強(qiáng)、韌性好、抗腐蝕性強(qiáng)、抗熱震性好的復(fù)合陶瓷基板。 本文研究了氧化鋁和氧化鋯兩種材料進(jìn)行復(fù)合的最佳粉料比，充分利用各相的優(yōu)點(diǎn)以彌補(bǔ)其不足，分析并確定了最佳固相體積分?jǐn)?shù)，即在保證成型所需流動(dòng)性的前提下,凝膠注模技術(shù)還要求漿料應(yīng)具有盡可能高的固相含量，實(shí)驗(yàn)通過(guò)對(duì)不同體積分?jǐn)?shù)(固相含量從40%-55%)進(jìn)行對(duì)比實(shí)驗(yàn)研究的到了最佳固相體積分?jǐn)?shù)。采用凝膠注模成型技術(shù)制備Al2O3/ZrO2有色復(fù)合陶瓷，測(cè)定不同體積分?jǐn)?shù)的氧化鋁/氧化鋯懸浮體的粘度,得到粘度與剪切速率曲線(xiàn)；測(cè)定懸浮體的pH值并討論其對(duì)坯體的影響。在制備懸浮體的同時(shí)加入硝酸鈷作為增色劑，目的是使制出的陶瓷美觀。針對(duì)表面氧阻聚,本文通過(guò)采用表面改性的方法,既不增加坯體內(nèi)有機(jī)物的含量,也不降低坯體的強(qiáng)度,使坯體表面不起皮、不剝落，從而制得密度大、均勻性好、抗彎強(qiáng)度大、抗腐蝕性強(qiáng)的Al2O3/ZrO2有復(fù)色合陶瓷。對(duì)干燥脫模過(guò)程做了詳盡陳述，同時(shí)研究了坯體的燒結(jié)溫度曲線(xiàn)。 結(jié)果表明，通過(guò)坯體性能參數(shù)的比較知道氧化鋁氧化鋯兩種材料復(fù)合的最佳粉料比為80:20；最佳固相體積分?jǐn)?shù)確定為45%；最適pH值為7.8，此時(shí)懸浮體的流變性最好，最適合注模成型，制作出的配體成型好，不收縮；加入w5%的聚乙烯吡咯烷酮(PVP)能有效克服氧阻聚；加入w1%的硝酸鈷就可以達(dá)到很好的增色效果；燒結(jié)溫度控制在15000C，經(jīng)物相分析測(cè)試知，制得的有色復(fù)合陶瓷的體積密度、抗彎強(qiáng)度、硬度、韌性、抗腐蝕性、抗熱震性均高于單一氧化鋯陶瓷和氧化鋁陶瓷。 關(guān)鍵詞：凝膠注模成型；粉料比；聚乙烯吡咯烷酮 (PVP)；燒結(jié)溫度；有色復(fù)合陶瓷
ABSTRACT:The composite ceramic ZTA as well as steatite introduced. toughening mechanism is matrix grain refinement and transformation of micro cracks and toughening the toughening, crack steering and bifurcate, existing ZrO2 from the four to single inclined phase change is considered the effective ways to improve ceramic brittle. Because zirconia base aluminum oxide compound ceramic substrates exists weak, brittle strong rheology, ceramic easily broken, in this article, based on the corresponding change upcoming alumina with zirconia as substrate to toughening, Strong hardness transplantable and good toughness, corrosion resistance is strong, thermal shock resistance good composite ceramic substrates. This paper studies the alumina and zirconia two materials the best powder composite than, make full use of the advantages of each phase to cover their inadequacy, analysis and determined the best solid-phase volume fraction, namely needed liquidity in guarantee under the premise of shape, gel injection molding technology also requires slurry should have as high solid content, experiment through different volume fraction (solid content from 40 - 55 percent) compared to the best of the experimental study of solid-phase volume fraction. Adopt gel mould molding technology preparation Al2O3/ZrO2 non-ferrous composite ceramic, measuring different volume fraction of Al2O3/ZrO2 suspension body the viscosity, get viscosity and shear rate curves; Determination of suspension body pH value and discuss the influence of the billet body .In the preparation of suspension body simultaneously to join nitric acid cobalt as graces agent, the purpose is to make produce ceramic beautiful. According to surface oxygen inhibitor, In this paper, the method of using surface modification. Neither increase in the content of organic matter, strand don't reduce the intensity, given photo-cell and make billet body surface not peeling, don't flake, thus made big density, good uniformity, flexural strength and corrosion resistance strong Al2O3/ZrO2 have multi-color and ceramics. Demoulding process of dry made detailed statement, given photo-cell and also studied the sintering temperature curve. The results show that: Through comparison of given photo-cell and performance parameters of alumina zirconia two that composite than the best powder for 80:20; Best solid-phase volume fraction determined for 45 percent; The optimal pH value for 7.8,At best, the rheology of suspension body. The most suitable for injection molding forming, produce ligand forming good, No shrinkage; Join w5 % polyethylene pyrrole (PVP) can effectively overcome oxygen inhibitor; Join w1 % of nitric acid cobalt can achieve good graces effect;The sintering temperature control in 15000C, the analysis test object is known system of non-ferrous composite ceramic volume density, flexural strength, hardness and toughness, corrosion resistance, thermal shock resistance are higher than the single zirconia ceramics and alumina ceramics. Keywords: Gel mould molding; Powder ratio; Polyethylene pyrrole (PVP); The sintering temperature; Non-ferrous composite ceramic |
