Complex-phase ceramic material with stress irradiance and electroluminescence characters and preparation thereof

Abstract

The invention discloses a self-assembly bi-phase composite ceramic powder, which is characterized in that the powder has a molecular formula of Ba1-x1-x2-x3-ySrx1Cax2Ax3Ry Ti1-zMzO3, wherein, 0<=x1<=0.18, 0.21<=x2<=0.90, 0.0001<=x3<=0.13, 0.0001<=y<=0.05, 0<=z<=0.20; A is a bivalent element of Mg, Pb, Zn, Cu or Cr, R is La, Pr, Nd, Sm, Eu, Gd, Tb, Dy or Er, and M is a quadrivalent element of Zr, Ce, Cu or Sn. The composite ceramic includes two phases, the content of barium in the first phase is larger than the calcium content, and the calcium content in the second phase is larger than the barium content. The ceramic powder has the features of stress luminescence and electroluminescence, and can be used for the stress distribution measurement and adhesive strength measurement of various parts and members and in plane illumination devices. The parts can be luminous when being coated with ceramic powder on surfaces and applied with stress. The luminous intensity of stress luminescence is in direct ratio with the applied stress in the elastic limit.

Description

technical field [0001] The invention relates to a composite ceramic material with stress luminescence and electroluminescence properties and a preparation method thereof. Background technique [0002] Some materials can emit light under the action of an external field, such as ultraviolet light and visible light excitation (photoluminescence), electron beam, X-ray excitation, electric field excitation (electroluminescence), etc. This phenomenon has been widely known and widely used. In recent years, a new type of effect—the stress luminescence effect, the development of new stress luminescence materials and advanced testing methods have attracted people's attention. Stress luminescence is a phenomenon in which mechanical energy is converted into light energy, that is, mechanical stress is applied to a material to make it emit light. Can be divided into destructive stress luminescence and non-destructive (elastic) stress luminescence. The phenomenon of destructive stress lu...

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Problems solved by technology

At present, the main problems in the research of stress luminescence materials are as follows: (1) The mechanism of stress luminescence is still unclear. Although it is believed that stress luminescence is related to the piezoelectric effect, it is only seen from the properties of the material, which is limited to the phenomenon discussion stage, and it is still unclear. There is no accepted theoretical model; (2) There are too few types of existing high-performance stress-luminescent materials, and the emitted spectrum is limited, such as SrAl 2 o 4 :Eu emits green light, (Ba, Ca)TiO 3 : Pr emits red light, which hinders the application in wider fields; in addition, the luminous intensity of the latter is not strong enough; (3) The evaluation system of stress luminescence performance has not been established, and there is no international or a certain national standard

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