摘要:
A high-purity rare earth metal oxide material powder of purity of 99.9% or over, of which Al content is 5-100 wtppm in metal weight and Si content is 10 wtppm or under in metal weight, and a binder are used to prepare a molding body of which molding density is 58% or over of the theoretical density. The binder is eliminated by thermal treatment, and then the molding body is sintered in an atmosphere of hydrogen or a rare gas or a mixture of them or in a vacuum at a temperature being not lower than 1450° C. and not higher than 1700° C. for 0.5 hour or over to prepare A transparent sintered rare earth metal oxide body represented by a general formula R2O3 (R being at least one element of a group comprising Y, Dy, Ho, Er, Tm, Yb and Lu).
摘要翻译:纯度为99.9%以上的高纯度稀土金属氧化物材料粉末,其中Al含量为金属重量为5-100重量ppm,Si含量为10重量ppm或以下金属重量,使用粘合剂制备 成型体的成型密度为理论密度的58%以上。 通过热处理去除粘合剂,然后将模塑体在氢气或稀有气体或它们的混合气氛中或在不低于1450℃且不高于1700℃的真空中进行烧结 0.5小时以上制备由通式R 2 O 3表示的透明烧结稀土金属氧化物体(R为包含Y,Dy,Ho,Er,Tm,Yb和Lu的至少一种元素)。
摘要:
A hydrothermal method for forming nanoparticles of a rare earth element, oxygen and fluorine has been discovered. Nanoparticles comprising a rare earth element, oxygen and fluorine are also described. These nanoparticles can exhibit excellent refractory properties as well as remarkable stability in hydrothermal conditions. The nanoparticles can exhibit excellent properties for numerous applications including fiber reinforcement of ceramic composites, catalyst supports, and corrosion resistant coatings for high-temperature aqueous solutions.
摘要:
A TAG, LAG or YbAG anti-corrosion layer of which Si content is 100 ppm or under and total content of Ca and Mg is 200 ppm or under is provided on the internal surface of a tubular YAG base of a discharge envelope. The mean particle size of the anti-corrosion layer is 20 &mgr;m or over, and the mean particle size of the base is 15 &mgr;m or under.
摘要:
Disclosed is a method for the preparation of a high-quality sintered body of a rare earth oxide or a composite oxide of a rare earth oxide and an adjuvant oxide such as aluminum oxide. The method comprises shaping a rare earth oxide powder characterized by specified particle diameter distribution values of D50 and D90 and a specified specific surface area or a powder blend of the rare earth oxide and adjuvant oxide into a powder compact and subjecting the powder compact to a sintering heat treatment at a specified sintering temperature by increasing and decreasing the temperature up to and from the sintering temperature each at a rate not exceeding a specified upper limit.
摘要:
A semiconductive ceramic is produced by sintering a semiconductive ceramic material containing a mixed powder of a lanthanum compound and a cobalt compound. The mixed powder has a specific surface area of about 3 m2/g or more, an average primary particle size of about 2.0 &mgr;m or less, and an average secondary particle size of about 10 &mgr;m or less.
摘要:
A sintered ceramic for a scintillator having a composition represented by the general formula of Gd3-xCexAlySizGa5-y-zO12, wherein 0.001≦x≦0.05, 1≦y≦4, and 0.0015≦z≦0.03, is produced by mixing gadolinium oxide, aluminum oxide, gallium oxide, a cerium salt, a silicon compound and a fluorine compound in such proportions as to provide the above composition; calcining the resultant mixture at a temperature of 1400-1600° C.; disintegrating the resultant calcined body to ceramic powder; pressing the ceramic powder to provide a green body; and sintering the green body at a temperature of 1600-1700° C. in a non-oxidizing atmosphere at 5×104 Pa or more, and optionally further by hot isostatic pressing at a temperature of 1400-1600° C. in an argon atmosphere.
摘要翻译:用于闪烁体的烧结陶瓷,其具有由通式Gd 3-x Ce x Se x Ga x-y-z O 12表示的组成,其中0.001≤x≤0.05,1≤y≤4,0.0015≤z≤0.03,为 通过以提供上述组成的比例混合氧化钆,氧化铝,氧化镓,铈盐,硅化合物和氟化合物而制备的; 在1400-1600℃的温度下煅烧所得混合物。 将得到的煅烧体分解成陶瓷粉末; 按压陶瓷粉末提供一个绿色的身体; 并在1600-1700℃的温度下在5×10 4 Pa以上的非氧化性气氛中烧结生坯,任选在氩气气氛下,在1400〜1600℃的温度下进一步进行热等静压。
摘要:
A polishing slurry, useful in optical or CMP applications, comprises a ceria with a BET surface area of at least 10 m2/gm. The slurry may be made by subjecting a commercial ceria slurry comprising agglomerates to a mechano-chemical treatment at a pH of from 9 to 11 using media that are low purity alpha alumina or zirconia. Preferred slurries maintain a positive surface charge at all pH values. CMP slurries preferably comprise in addition an anionic surfactant to aid in removal of surface residues.
摘要:
A ceramic composition having a high adsorptive capacity for oxygen at elevated temperature, including at least one of: Bi2−yEryO3−d; Bi2−yYyO3−d; La1−yBayCo1−xNixO3−d; La1−ySryCo1−xNixO3−d; La1−yCayCo1−xNixO3−d; La1−yBayCo1−xFexO3−d; La1−ySryCo1−xFexO3−d; and La1−yCayCo1−xFexO3−d; wherein x is from 0.2 to 0.8, y is from 0 to 1.0 and d=0.1 to 0.9. Such ceramic composition may be made using a modified Pechini synthetic procedure. The resulting ceramic composition is usefully employed as an adsorbent for separation of oxygen from an oxygen-containing feed gas mixture, e.g., in a pressure swing adsorption (PSA) process.
摘要翻译:一种陶瓷组合物,其在升高的温度下具有高的氧吸附能力,包括以下中的至少一种:Bi 2-y E y O 3 -d; Bi2-yYyO3-d; La1-yBayCo1-xNixO3-d; La1-ySryCo1-xNixO3-d; La1-yCayCo1-xNixO3-d; La1-yBayCo1-xFexO3-d; La1-ySryCo1-xFexO3-d; 和La1-yCayCo1-xFexO3-d; 其中x为0.2至0.8,y为0至1.0,d = 0.1至0.9。 这种陶瓷组合物可以使用经修改的Pechini合成方法制备。 得到的陶瓷组合物有用地用作用于从含氧进料气体混合物中分离氧气的吸附剂,例如在变压吸附(PSA)方法中。
摘要:
A ceramic compound which undergoes martensitic transformation comprises a compound represented by compositional formula Ln1-xSixAlO3+0.5x obtained by substituting a part of LnO1.5 in LnAlO3-type compounds with SiO2, where Ln represents at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb, and x=0.01 to 0.3.