Studies On Fabrication Process And Ballistic-resistance Of Corundum Balls/aluminum Alloy Composites

Lightweight composites armour plays an important role in individual soldier protective and weapon equipment protection. The preparing process of lightweight composites armour is also a key technology of national defense, which has received wide attention of developed countries. This paper has proposed a new composites structure of ballistic-resistence which was composed of hardness corundum balls and soft aluminium alloy.The Thesis included two parts. One part was about the fabrication and properties of corundum balls-aluminum alloy composite. Another part focused on the investigation of ballistic efficiency factor, anti-ballistic mechanism, and damage mechanism of corundum balls/aluminum alloy composite through the armours piercing experiments. The results are listed as follows:1. Powder-filled-melt was a new and effective method for preparing corundum balls/aluminum alloy composites.2. The mixture powders contain 3wt% Mg and 3wt% K2ZrF6 were a desirable wetting agent through experiments .The results showed that the best parameters were: argon shield, infiltration temperature 900℃, and hold time 45minutes.3. The depth of penetration was measured in all the experiments.The mass efficiency of wetting corundum balls with aluminum alloy composite was 3.24. The mass efficiency of non-wetting corundum balls with aluminum alloy composite was 1.33.4. Average density of the corundum balls /aluminum alloy composite was equal to aluminum alloy because of presence of matrix foam aluminum alloy.5. Concentrated load on the surface of the composites coming from the AP changed local uniform load by rotated corundum balls, which was main anti-ballistic mechanism of corundum balls/aluminum alloy composites.6. Corundum balls were separated from aluminum alloy matrix and resulted in the shearing of aluminum alloy matrix, which was the main damage form of wetting corundum balls with aluminum alloy composite. Spalling and shattering of corundum balls was main damage forms of non-wetting corundum balls with aluminum alloy composite.