Preparation method for boron carbide-aluminium alloy composite board with crack-arresting through holes
An aluminum alloy and boron carbide technology, which is applied in the field of preparation of boron carbide ceramic-aluminum alloy composite plates, can solve the problems such as difficulty in giving full play to the excellent characteristics of boron carbide ceramics, difficulty in preparing large-size products, and limitations of large-thickness products, etc. The effect of mitigating adverse effects, simple process, and improving impact resistance
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Embodiment 1
[0017] Step 1: Preparation of boron carbide ceramic plate
[0018] a. A certain proportion of B 4 Raw materials such as C powder and modified phenolic resin are ball milled in a ball mill for 12-24 hours to form a slurry. Raw material formula: B 4 C quality 80kg, modified phenolic resin 7kg, PVA800g, PEG400g, absolute ethanol 90kg; B 4 C is graded from powders of three particle sizes, one B 4 The average particle size of C powder is 8-10 microns, and the mass accounts for B 4 45% of the total mass of C; another B 4 The average particle size of C powder is 20-25 microns, and the mass accounts for B 4 35% of the total mass of C; the third type B 4 The average particle size of C powder is 2-4 microns, and the mass accounts for B 4 20% of the total mass of C; the ball milling medium is silicon carbide balls, and the weight ratio of balls to materials is 2: 1;
[0019] B carry out granulation with self-manufacturing granulator, and granulator is the self-made granulator of t...
Embodiment 2
[0029] The experimental procedure of this example is the same as that of Example 1, the only difference is that the step d) in the preparation method of the boron carbide ceramic plate in step 1) of Example 1 is replaced by: heating the compact in a mesh belt furnace, and the phenolic resin is decomposed And produce a coated carbon source to obtain a green body. The highest decomposition temperature of the compact in the mesh belt furnace is 820-850°C, and the speed of the mesh belt is 80-90 mm / min.
[0030] The company adopts the self-innovated reaction sintering process to coat the boron carbide powder with carbon source. By adding a binder, the strength of the compact is significantly improved. After the drying process, the crack hole can be processed on the green body. This process reduces the dissolution of silicon relative to boron carbide particles during the sintering process, improves the mechanical properties of ceramic products, and increases the microhardness, flexu...
Embodiment 3
[0032] The experimental procedure of this embodiment is the same as that of Example 1, and the only difference is the preparation method of the boron carbide ceramic plate in step 1) of Example 1; those skilled in the art know a variety of methods that can prepare a green body, such as using Conventional ball milling raw materials, granulator and compaction technology, as long as the granulated powder is controlled to be pressed into a compact with a thickness of 60-80mm, the purpose of the present invention can be achieved.
[0033] The brittleness of ceramic materials makes it poorly resistant to multiple bullets when used as a bulletproof material. After being impacted by a bullet, it is easy to cause overall fragmentation, disintegration of the structure, and cannot continue to protect subsequent strikes. Therefore, it is necessary to reduce the brittleness of boron carbide ceramics. The expansion of cracks in the center makes it only partially shattered when it is impacted...
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Abstract
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