Integral cambered large-sized alumina bulletproof ceramic plate as well as mould and manufacturing method thereof

Abstract

The invention relates to an integral cambered large-sized alumina bulletproof ceramic plate as well as a mould and a manufacturing method thereof. The manufacturing method comprises the following steps of: preparing gelling water-based ceramic slurry, casting the slurry into a special mould formed by modeling plates having equal radiuses in internal and external cambered surfaces, designed in the invention, demoulding after the gel is cured, obtaining a plurality of integral bulletproof ceramic plate gel bodies having equal radiuses in internal and external cambered surfaces, placing the bodies on gesso support plates having the same cambered shapes and drying, and then laying the bodies on refractory firing support plates having the same cambered shapes in an overlapped manner for sintering densification. By means of the invention, the overlapped laying and the shape-controlled sintering of a plurality of cambered ceramic plates are realized and a plurality of integral cambered bulletproof ceramic plates having equal radiuses in internal and external cambered surfaces and equal sizes can be acquired. The problem that the charging amount is low because each of the integral cambered bulletproof ceramic plates needs one refractory firing support plate having the same cambered shape when sintering is avoided; and the integral cambered large-sized alumina bulletproof ceramic plate has the advantages of saved energy and reduced consumption, uniform product appearance and good internal quality, and is suitable for the industrial batch production.

Description

technical field [0001] The invention belongs to the field of ceramic products, and in particular relates to an integral arc-shaped large-size alumina bulletproof ceramic plate, a mold and a manufacturing method thereof. Background technique [0002] Body armor is a protective equipment commonly used by individual soldiers, armed police, security guards, and armed escorts, and is a dual-use product for both military and civilian use. The core component of the body armor is the bulletproof board. The material of the board has gone through hard metal boards and soft synthetic fiber boards, and has now developed to the third generation of ceramic / synthetic fiber composite boards. It is the main material for body armor at present. Direction of development. [0003] The backboard of the composite board is made of aramid fiber or ultra-high molecular weight high-strength high-modulus polyethylene fiber composite material. Bulletproof panels mainly include alumina, silicon carbide...

AI Technical Summary

Problems solved by technology

The problems existing in the prior art are that the four sides of each small piece of ceramic need to be precisely ground, which greatly increases the cost;

[0007] ① It is possible to produce the green body of the required shape by the grouting molding method, but its production efficiency is low, and a density gradient will be generated inside the green body, which will affect the performance of the ceramic, especially its dimensional accuracy is difficult to guarantee;

[0008] ②The dry forming method cannot avoid the agglomeration of the powder and the unevenness of the green body structure, and because the bulletproof ceramic plate is a large-scale plate with a curvature, the laying of the granulated powder during the dry pressing process is very difficult. Difficult, easy to cause uneven thickness and density of ceramic plates;

[0009] ③Isostatic pressing For large-sized arc-shaped ceramic plates with a height of 300mm, a width of 250mm, and R400mm, a super-sized isostatic press with a diameter of more than 1000mm is required to form a cylinder with a diameter of 800mm before cutting, which requires high equipment requirements and difficult operation. , the cutting of the green body after forming is easy to cause corner defects, and the production efficiency is low, so it is not suitable for mass production;

[0013] The analysis shows that when the thickness of the ceramic plate is 10mm and the radius of the outer arc is 400mm, the radius of the inner arc is 390mm, and the radius of the outer arc of the upper ceramic plate becomes 390mm and the radius of the inner arc becomes 380mm. By analogy, the radius of the outer arc surface of the upper ceramic plate becomes 380mm and the radius of the inner arc surface becomes 370mm... Obviously, the requirements for the consistency of the shape of the arc surface of the laminated ceramic plate cannot be guaranteed.

During shape-controlled sintering, only one ceramic slab is placed on each refractory setter plate. Although it is feasible to prepare a small amount of integral arc-shaped bulletproof ceramic panels in the laboratory, the proportion of ceramic plates in the furnace is very small, resulting in high energy consumption. The production efficiency is very low, which obviously cannot meet the needs of industrial mass production

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