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Sandwich structure bulletproof ceramic sheet and low temperature sintering preparation method

A ceramic chip and sandwich technology, which is applied in the field of protective materials and hard bulletproof materials, can solve the problems of high cost and complicated process, and achieve the effect of improving impact resistance

Inactive Publication Date: 2013-11-06
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using technologies such as spark plasma sintering (SPS) or hot isostatic pressing (HIP), although the sintering temperature can be greatly reduced, the corresponding cost is very high and the process is complicated.

Method used

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  • Sandwich structure bulletproof ceramic sheet and low temperature sintering preparation method
  • Sandwich structure bulletproof ceramic sheet and low temperature sintering preparation method
  • Sandwich structure bulletproof ceramic sheet and low temperature sintering preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A bullet-proof ceramic sheet with a sandwich structure is characterized in that the components of the upper and lower surface layers of the bullet-proof ceramic sheet with a sandwich structure are 95% Al by mass percentage 2 o 3 +5%ZrO 2 , the composition of the center layer is 85% Al by mass percentage 2 o 3 +15%ZrO 2 The thickness ratio of the surface layer and the center layer of the bullet-proof ceramic sheet of sandwich structure after sintering is 1:12; 50mm, thickness 10mm; after sintering, the relative density of the bulletproof ceramic sheet is 99.5%, the impact toughness is 1.4J, the bending strength is 577MPa, and the fracture toughness is 10.56 MPa m 1 / 2 .

[0026] Its preparation steps are as follows:

[0027] (1) Preparation of composite powder: prepare 95% Al according to mass percentage 2 o 3 +5%ZrO 2 and 85% Al 2 o 3 +15%ZrO 2 Composite powder, mixed by ball mill, dried and ground for later use; where Al 2 o 3 and ZrO 2 The particle sizes...

Embodiment 2

[0033] A bullet-proof ceramic sheet with a sandwich structure is characterized in that the composition of the upper and lower surface layers of the bullet-proof ceramic sheet with a sandwich structure is 85% Al by mass percentage 2 o 3 +15%ZrO 2 , the composition of the center layer is 75% Al by mass percentage 2 o 3 +25%ZrO 2 The thickness ratio of the surface layer and the center layer of the bullet-proof ceramic sheet of sandwich structure after sintering is 1:6; 40mm, thickness 8mm; after sintering, the relative density of the bulletproof ceramic sheet is 98.5%, the impact toughness is 1.0J, the bending strength is 514MPa, and the fracture toughness is 9.88 MPa m 1 / 2 .

[0034] Its preparation steps are as follows:

[0035] (1) Preparation of composite powder: prepare 85% Al according to mass percentage 2 o 3 +15%ZrO 2 and 75% Al 2 o 3 +25%ZrO 2 Composite powder, mixed by ball mill, dried and ground for later use; where Al 2 o 3 and ZrO 2 The particle sizes ...

Embodiment 3

[0041] A bullet-proof ceramic sheet with a sandwich structure is characterized in that the composition of the upper and lower surface layers of the bullet-proof ceramic sheet with a sandwich structure is 90% Al by mass percentage 2 o 3 +10%ZrO 2 , the composition of the center layer is 80% Al by mass percentage 2 o 3 +20%ZrO 2 The thickness ratio of the surface layer and the center layer of the bullet-proof ceramic sheet of the sandwich structure after sintering is 1:10; the surface of the bullet-proof ceramic sheet is a square, and the thickness direction is a sandwich layered structure. After sintering, the square side length is 40mm and the thickness is 10mm; The relative density of the rear bulletproof ceramic sheet is 99%, the impact toughness is 1.2J, the bending strength is 507MPa, and the fracture toughness is 10.44MPa m 1 / 2 .

[0042] Its preparation steps are as follows:

[0043] (1) Preparation of composite powder: prepare 90% Al according to mass percentage ...

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Abstract

The invention relates to a sandwich structure bulletproof ceramic sheet. The bulletproof ceramic sheet is characterized in that its upper surface layer and lower surface layer are composed of 85-95% of Al2O3 and 5-15% of ZrO2 by mass, and a central layer consists of 75-85% of Al2O3 and 15-25% of ZrO2 by mass; the surface layers and the central layer of the sintered sandwich structure bulletproof ceramic sheet are in a thickness ratio of 1:5-15; the surface of the bulletproof ceramic sheet is in a regular hexagon or square shape, the bulletproof ceramic sheet has a sandwich layer structure in the thickness direction, for the sintered regular hexagon, the length of its diagonal lines is 40-60mm, and the thickness is 7-12mm, or for the square, the side length is 30-60mm, and the thickness is 7-12mm; and the sintered bulletproof ceramic sheet has a relative density of 98.5-99.5%, impact toughness of 1-1.4J, bending strength of 500-600MPa, and fracture toughness of 8-11 MPa.m<1 / 2>. The sandwich structure bulletproof ceramic sheet can be used as a hard bulletproof material of human body and armor. By introducing the sandwich structure to alumina-zirconia composite ceramics, certain component difference between adjacent layers is ensured, so that the ceramic sheet can have excellent impact resistance. And a three-step forming method is employed to achieve densification of the ceramic sheet in an atmospheric environment at a low temperature.

Description

[0001] technical field [0002] The invention relates to a bullet-proof ceramic material with a special structure and a preparation method thereof, in particular to an oxide bullet-proof ceramic sheet with a sandwich structure and a preparation method for low-temperature sintering. The invention is mainly used for hard bulletproof materials in protective products, and belongs to the technical field of protective materials. Background technique [0003] With the advancement of military science and technology, the performance of bullet-type offensive weapons has been greatly improved, and the threat to the human body and equipment is increasing. From the perspective of human body and equipment protection, bulletproof materials are required to have higher protection effects and more economical and reasonable manufacturing methods. For the impact of bullets with fast bullet speed and high explosive force, it is unreliable to rely solely on soft protective materials to buffer a...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/48C04B35/622F41H1/00
Inventor 周泽华易于王泽华王国伟
Owner HOHAI UNIV
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