A kind of preparation method of anisotropic lanthanum calcium manganese oxide ceramic target

Abstract

The invention discloses a preparation method of an anisotropic lanthanum calcium manganese oxygen-based ceramic target, and belongs to the technical field of ceramic preparation. The method concretelycomprises the following steps of a soil process, a gel process, a glue drying process, a primary crushing process, a primary roasting process, a silver doping process, a powder static pressure process, a secondary roasting process, a secondary crushing process, a pre-molding pressing process, a final mold static pressing process and a tertiary roasting process. The method provided by the invention has the advantages that the Ag doping effect can be improved through liquid phase mixing and seepage sintering; the doping loss is greatly reduced, so that the practical doping proportion is similarto the calculation quantity; the anisotropy of the ceramic target is further enhanced; the non-oxidization sintering process is combined, so that a La1-xCaxMnO3 substrate and an Ag element are not oxidized before the doping completion; the doping effect is further improved. The isostatic cool pressing process is combined; multidirectional stress is generated in the seepage and pressing process; the target optimum growth is facilitated; meanwhile, the defect tissues are greatly eliminated; the ceramic target has strong anisotropy.

Description

technical field [0001] The invention relates to a method for preparing an anisotropic lanthanum calcium manganese oxide ceramic target, belonging to the technical field of ceramic preparation. Background technique [0002] La1-xCaxMnO3 is a rare earth doped manganese oxide with a perovskite structure. With giant magnetoresistance effect and laser-induced voltage effect, it can be used to make giant magnetoresistance bolometers, photoelectric conversion devices, high-density storage heads, non-contact magnetoresistance switches, magnetic sensitive sensors, thermoelectric devices, etc. The research interest of the majority of scholars has become another research hotspot in strongly correlated material systems after high-temperature superconductivity. The current La1-xCaxMnO3 system research focuses on the synthesis and preparation of doped Ag. First, it can assist the ceramic target to exhibit optimal growth during the growth process, thereby strengthening the anisotropy of t...

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Problems solved by technology

However, most of the current preparation processes have the following common problems: (1) Most of the prior art uses granulated silver powder for mixing and sintering, and achieves the purpose of doping through solid-state reaction, although it can be achieved by controlling the particle size of silver powder To improve the effect, but the defects of solid-state reaction still exist, the doping effect is poor, the doping amount loss is too large, and the doping ratio is far lower than the calculated amount; (2) No matter what method is used for doping in the current process, There are no anti-oxidation measures. One is that after the La1-xCaxMnO3 matrix material is oxidized to form a stable state, the Ag element is not easy to dope into it, and the other is that the Ag element itself is oxidized, resulting in poor doping effect and cannot effectively enter the matrix material. ; (3) In the existing process operation, the use of conventional pressing methods generally produces directional stress, which is not conducive to the selective growth of the target material in subsequent sintering, and secondly, it cannot substantially eliminate defects

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