CAJ | 학술논문

以无机盐Al(NO_3)_3·9H_2O为先驱体、水为溶剂,加入不同浓度的胶溶剂HNO_3,采用溶胶-凝胶(Solgel)法制备了勃姆石(γ-AlOOH)溶胶.分别以溶液下降法和真空浸渍法在三维网络碳化硅陶瓷骨架(3D-SiC)表面浸涂γ-AlOOH溶胶,采用不同烧结制度在3D-SiC表面生成了Al_2O_3薄膜.采用X射线衍射仪(XRD)、红外光谱仪(IR)和扫描电子显微镜(SEM)分析了薄膜的物相和显微结构,并检测了薄膜的抗热震性.结果表明,采用真空浸渍法在3D-SiC表面浸涂加入浓度0.22mol/L HNO_3制备的γ-AlOOH溶胶能烧结形成致密平整的Al_2O_3薄膜.升高烧结温度,Al_2O_3晶粒长大,900℃时薄膜最致密且能观测到玻璃态显微结构.薄膜的抗热震性随烧结温度升高而提高.
이무궤염Al(NO_3)_3·9H_2O위선구체、수위용제,가입불동농도적효용제HNO_3,채용용효-응효(Solgel)법제비료발모석(γ-AlOOH)용효.분별이용액하강법화진공침지법재삼유망락탄화규도자골가(3D-SiC)표면침도γ-AlOOH용효,채용불동소결제도재3D-SiC표면생성료Al_2O_3박막.채용X사선연사의(XRD)、홍외광보의(IR)화소묘전자현미경(SEM)분석료박막적물상화현미결구,병검측료박막적항열진성.결과표명,채용진공침지법재3D-SiC표면침도가입농도0.22mol/L HNO_3제비적γ-AlOOH용효능소결형성치밀평정적Al_2O_3박막.승고소결온도,Al_2O_3정립장대,900℃시박막최치밀차능관측도파리태현미결구.박막적항열진성수소결온도승고이제고.
The preparation process of Al_2O_3 thin film is represented by the sol-gel method, in which Al(NO_3)_3·9H_2O is used as precusor, water and HNO_3 as solvent and peptizing agent, respectively. Dip-coating and vacuum impregnation methods are used to coat γ-AlOOH sol solution on three-dimensional silicon carbide sintered at different temperature to form Al_2O_3 thin film. X-ray diffraction(XRD), infrared spectrometry(IR), scanning electronic microscope(SEM) are used to study the mierostrueture and phase constitution of the film. The investigation clearly shows that the thin film which prepared from γ-AlOOH sol solution added 0.22mol/L HNO_3 with vacuum impregnation method, is coated on three-dimensional silicon carbide perfectly. The grain of Al_2O_3 increases with the sintering temperature increasing. The thin film is full density at 900℃, and the glass microstructure is observed. The thermal shock resistance of the Al_2O_3 thin film increases with the sintering temperature increasing.