Ion-doped ZrWMoO8 complex-phase controlled expansion material and prepration method thereof

Abstract

The invention discloses an ion-doped ZrWMoO8 complex-phase controlled expansion material and a prepration method thereof. The method comprises the following steps: dissolving zirconium oxychloride and aluminium nitrate into 100-150mL of distilled water, so as to prepare a solution A; dissolving ammonium paratungstate, ammonium molybdate tetrahydrate and ammonium metavanadate into 100-150mL of distilled water, heating and dissolving to obtain a solution B; dripping the solutions A and B to 50mL of absolute ethyl alcohol, stirring and mixing evenly, transferring to a rotary evaporator and evaporating, so as to obtain mixed powder; drying, milling, and burning in a muffle furnace at 550-650 DEG C for 2-3 hours; putting the obtained precursor powder into a mold, and pressing into a cylindrical sample; and putting into a platinum crucible, burning in a resistance furnace at 940-970 DEG C for 2 hours, taking out and cooling to room temperature. By adopting a method for in-situ synthesis of composite materials together with solid solution preparation, preparation of a matrix phase, a dispersion phase and the composite materials is finished by one step; the phases are dispersed evenly; the porosity of the cross section is reduced along with increase of ion mixing amount; the compactness is increased; the breaking strength is increased; and the good sintering effect gradually is achieved.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a ZrWMoO 8 Multiphase controllable expansion material and its preparation method. Background technique [0002] The problem of thermal expansion is an unfavorable factor in many fields, and it is an urgent problem that exists in functional and structural materials such as precision devices, optical fibers, circuit boards, sensors and fuel cells. The discovery of negative expansion (NTE) materials makes it possible to solve this problem, which has aroused great interest of many scientific researchers. From the 1990s, ZrW 2 o 8 Since the unique structure and negative expansion properties were revealed, the materials community has set off a wave of research on negative expansion materials, and has rapidly developed into a specialized scientific research field. Among the numerous negative expansion materials, one advantage of isotropic NTE materials is that the orient...

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Problems solved by technology

[0006] The present invention aims at the defect of the mismatch problem of positive and negative thermal expansion materials that occurs in the research of near-zero expansion composite materials, and provides an ion-doped ZrWMoO 8 Multi-phase controllable expansion material and its preparation method, which adopts the method of ion doping, in ZrWMoO 8 Doped with Al in the crystal 3+ and V 5+ ions, forming Zr 1-x al x MoW 1-y V y o 8-x / 2-y / 2 Solid solution, when the dopant ion exceeds its solid solubility, a composite material of solid solution and doped oxide is formed, which can realize the controllable adjustment of the expansion coefficient

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