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PROCESS FOR THE PREPARATION OF CERAMIC MATERIAL BASED ON SINTERABLE METAL POWDERS AND THE MATERIAL OBTAINED
PROCESS FOR THE PREPARATION OF CERAMIC MATERIAL BASED ON SINTERABLE METAL POWDERS AND THE MATERIAL OBTAINED
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机译：基于可烧结金属粉末的陶瓷材料的制备方法及获得的材料
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1430144 Ceramic material BABCOCK & WILCOX CO 19 April 1973 [12 May 1972] 19159/73 Heading C1A A ceramic material comprises grains of sintered aluminium oxide having grains with a size distribution observed on a fracture surface with a scanning electron microscope at 10,000 magnifications as follows: less than 0À3 Á = 0%, between 0À3 and 0À5 Á = 25%, between 0À3 and 0À7 Á = 54%, between 0À3 and 0À9 Á = 80% and between 0À3 and 1À5 Á = 100%. A suitable method of converting a sinterable powder into a fine grain ceramic metal oxide of the above type comprises a first step of heating the powder to a temperature that produces an onset of powder shrinkage, a step of applying a maximum process physical pressure to the powder with the onset of shrinkage, a step of raising the temperature of the powder, with the onset of shrinkage, at a lower rate than the first heating step, to a temperature of more than 800‹ C. and holding the pressure and attained temperature for more than two minutes. It is preferred to heat the powder in the first heating step to more than 400‹ C. at a rate of at least 400‹ C. per minute and to use a maximum hot process pressure of 2000-6000 lbs./sq. inch. The preparation of Al 2 O 3 and UO 2 ceramic materials are exemplified.
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机译：1430144陶瓷材料BABCOCK＆WILCOX CO 1973年4月19日[1972年5月12日] 19159/73标题C1A陶瓷材料包括烧结氧化铝颗粒，该颗粒的尺寸在断裂表面上用扫描电子显微镜在10,000倍下观察到，其分布如下：小于0‑3Á= 0％，0‑3至0‑5Á= 25％，0‑3至0‑7Á= 54％，0‑3至0‑9Á= 80％，0‑3至1‑5Á= 100％。将可烧结粉末转变成上述类型的细晶粒陶瓷金属氧化物的合适方法包括第一步，将粉末加热到产生粉末收缩开始的温度，对粉末施加最大工艺物理压力的步骤。随着收缩的开始，以比第一加热步骤低的速率将随着收缩的开始将粉末的温度升高到高于800℃的温度并保持压力和达到的温度的步骤。超过两分钟优选在第一加热步骤中以至少每分钟400℃的速率将粉末加热至400℃以上，并使用2000-6000lbs./sq的最大热加工压力。英寸。举例说明了Al 2 O 3和UO 2陶瓷材料的制备。
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