Reinforced calcium borosilicate microcrystalline glass composite material and preparation method thereof

Abstract

The invention discloses a reinforced calcium borosilicate microcrystalline glass composite material and a preparation method thereof. The reinforced calcium borosilicate microcrystalline glass composite material contains a matrix composed of glass powder, a sintering aid and a colorant, and an alumina reinforced phase (composite powder) with the volume percentage of 5-35%. The glass powder is prepared from the following specific components in percentage by mass: 35 to 50% of CaO, 10 to 25% of B2O3, 35 to 50%t of SiO2, 0.1 to 1.5% of Al2O3, 0.1 to 1.5% of MgO and 0.1 to 2.5% of ZrO2. The glasspowder is mixed with 0.5-3.5% by mass of an external dopant (i.e., a compound of the sintering aid and the colorant); wherein the composite sintering aid is an xV<2>O<5>-yTeO<2>-z3Li<2>O*2B<2>O<3> composition, the colorant is any one or a combination of more than one of Cr2O3, Co2O3, CuO and MnO2, and the mass percentage content of the colorant accounts for 0-1.5%. According to the invention, sheet-shaped, whisker-shaped or short-fiber-shaped aluminum oxide with good reinforcing and toughening effects is utilized, and a staged hot-pressing casting sheet lamination method is adopted to reinforce and toughen calcium borosilicate microcrystalline glass with good high-frequency dielectric properties, so that a composite material plane or curved substrate with high strength (more than 250MPa) and low loss (less than 0.001) is prepared.

Description

technical field [0001] The invention relates to a glass-ceramic composite material, which belongs to the technical field of composite materials, in particular to a reinforced calcium borosilicate glass-ceramic composite material and a preparation method thereof. Background technique [0002] With the advent of wireless charging, 5G era, and smart society, inorganic non-metallic materials (glass and ceramics) are becoming more and more popular because they have no signal interference problems and are wear-resistant and scratch-resistant. The cover materials involved in the back cover of 5G mobile phones require good dielectric properties under microwave or high frequency conditions (such as low dielectric constant, low dielectric loss) and excellent thermal and mechanical properties (such as high mechanical strength and heat dissipation, etc.). Stabilized zirconia ceramic material has been used for mobile phone covers mainly because of its texture and high strength, but its ...

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Problems solved by technology

[0006] Sol-gel method: Although the components are not volatile, the calcination temperature is low, and the corrosion resistance of the crucible material is not high, but the cost of raw materials is high, the densification temperature of the sintered body is high, and the production cycle is long; solid-state reaction method: with sol - The gel method is similar, but the requirements for raw materials such as particle size are looser, and it is more suitable for mass production, but the processes such as calcination and ball milling are relatively cumbersome, and the sintering temperature is also too high; melting-water quenching method: its existence The problem is that components especially B 2 o 3 high-temperature volatilization of glass liquid, and high-temperature erosion of the crucible by molten glass, etc., but the requirements for the particle size, purity or type of raw materials are relatively loose, and it is also suitable for mass production of hundreds of kilograms to tons.

[0007] The existing technology does not strictly distinguish the densification process and the crystallization process of the calcium borosilicate glass-ceramic system, that is, it does not take advantage of the structural advantages of densification first and then crystallization, resulting in low sintering density and low degree of crystallization At the same time, the strengthening and toughening effect of the added phase is not optimized, so the mechanical strength of the material is difficult to exceed 200MPa, so it cannot meet the requirements of high-strength and high-frequency wave-transmitting performance, and it is difficult to obtain applications in the fields of military radome or civilian 5G mobile phone casing.

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