氢氧化铝晶粒的应力与强度分析

Stress and Strength Analysis of Al(OH)_3 Grains

根据国内氧化铝工业生产现状,结合氢氧化铝晶粒的显微结构,利用有限元方法,对氢氧化铝晶粒进行了结构静力分析,得到了氢氧化铝晶粒中填充小晶体的填充位置、数目及晶粒破损的缺口尺寸与晶粒强度的关系,并对实际产品的显微结构与强度的关系进行了考察.结果表明,晶粒中存在小晶体填充且填充位置处于整个缺口尺度的75%时,强度改善最为明显,并且强度随填充小晶体数目的增多而提高;晶粒的缺口尺寸在1～2μm范围内变化时,缺口越小,强度越好;通过氢氧化铝产品中晶粒的显微结构,应用有限元分析,可以从理论上判断氢氧化铝产品的强度.

Based on the SEM morphology of the gibbsite grains used in China＇s alumina industry, the finite element analysis method was applied to study the relations between the position and number of filling crystals and the strength of gibbsite grains. It has been discovered that the strength of gibbsite grains is strengthened with small filling crystals. The optimum position of filling is 75% of the length of the gap. The increase of the number of the filling crystals will improve the strength of the grains. When the gap varies from 1 to 2 μm, the larger the gap, the smaller the grain strength. Therefore, the finite element analysis can be used to evaluate the strength of the products of Al（OH）3 from the SEM morphology of the gibbsite grains.