混合炸药爆炸压实制备ZrB2-SiCw超高温陶瓷

为了改善ZrB2-SiC超高温陶瓷材料的韧性，采用黑索今与硝酸铵混合炸药爆炸压实制备了SiC晶须增韧ZrB2基超高温陶瓷，并研究爆炸压实过程中的能量与变形，爆炸压实坯密度与显微组织。结果表明，采用爆炸压实工艺制备了相对密度约95．25％的ZrB2-SiC。陶瓷复合材料。随着混合炸药中黑索今质量的增加，爆轰压力单调增加，爆炸坯密度先增加，后减小，有一个最大值；钢管的外径收缩率、等效应变与爆炸坯密度变化一致；钢管变形能几乎不变，爆炸冲击能与粉末压实能同步增加。由于爆炸冲击波的作用，SiC晶须被折断成碎片；其组织为均匀、碎小的SiC晶须镶嵌于较大的ZrB2颗粒中。

The ZrB2-SiCw Ultrahigh Temperature Ceramics Prepared by Explosive Compaction of Hybrid Explosive

SiC whisker toughness ZrB2 matrix composite materials were prepared by explosive compaction of the hybrid ammonium nitrate and RDX in order to improve the toughness of these materials, and the energy and deformation, the density and microstructure of the ZrB2-SiCw UHTCs were studied. The results showed that ZrB2-SiCw composites with 95.25% of the theory density were prepared by explosive compaction. With the raise of RDX explosive mass in the hybrid explosive, the explosive press increased gradually, while the density first increased, but then decreased, and there was a maximal value. The change of the reduction of the outer diameter and the equivalent strain of the steel tube was similar to the density change. The deformation energy of the steel tube hardly changed, while the explosive energy and compact energy of the powder increased synchronously. SiC whiskers had been broken off under the action of the explosive shock wave. The microstructure of the ZrB2 composites was the matrix particles beset by the whisker fragments.