Three-dimensional aluminum oxide fiber woven part reinforced aluminum oxide composite material based on aqueous slurry impregnation process and preparation method of three-dimensional aluminum oxide fiber woven part reinforced aluminum oxide composite material

Abstract

The invention relates to the technical field of continuous fiber reinforced ceramic matrix composite materials, and particularly discloses a three-dimensional aluminum oxide fiber woven part reinforced aluminum oxide composite material based on an aqueous slurry impregnation process, and the porosity of the composite material is 20-30%. A reinforced phase of the composite material is a continuous aluminum oxide fiber woven part, the woven part is in a fiber cloth sewing, two-dimensional and half or three-dimensional weaving mode, the mass content of alumina in alumina fibers is not lower than 70%, and the volume fraction of the fibers in the composite material is 40-45%. The aluminum oxide matrix of the composite material is prepared through the processes of multiple times of dipping, drying and sintering of water-based aluminum oxide powder slurry with high solid content and low viscosity, the solid content of the water-based aluminum oxide powder slurry is 30-40 vol%, the viscosity of the slurry is 5-30 mPas, the pH is 3-4.5, and the Zeta potential is 60-70 mV. The invention also provides a preparation method of the composite material. The reinforced fibers are arranged between the layers of the composite material, so that the integrity is good. The preparation method disclosed by the invention is simple in process, low in cost, good in environmental protection property and easy to realize large-scale industrialization.

Description

technical field [0001] The invention belongs to the technical field of continuous fiber reinforced ceramic matrix composite materials, in particular to an alumina fiber braided reinforced alumina composite material based on an aqueous slurry impregnation process and a preparation method thereof. Background technique [0002] Continuous alumina fiber reinforced oxide composites have excellent properties such as high temperature resistance, oxidation resistance, high strength, high toughness, corrosion resistance and wear resistance. Compared with non-oxide fiber reinforced ceramic matrix composites, there is no high temperature oxidation It can work for a long time in a high-temperature aerobic environment, and is an important candidate material for aero-engines, ground gas turbines, and hot parts of high-speed aircraft. [0003] Publication numbers CN 105254320A, CN 106699209A and CN 106904952A Chinese patent documents respectively disclose continuous oxide fiber reinforced ...

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Problems solved by technology

[0003] Publication numbers CN 105254320A, CN 106699209A and CN 106904952A Chinese patent documents respectively disclose continuous oxide fiber reinforced ceramic matrix composite materials and their preparation methods, all of which use organic precursor solution or sol to introduce the matrix, and undergo multiple dipping-curing-heat treatments to obtain Composite materials, this preparation method has some shortcomings: First, the organic precursor solution or sol is faced with complex chemical processes during drying and high-temperature heat treatment, which is easy to cause damage to the fiber; second, due to the ceramic yield of the organic precursor or sol Low, generally no more than 20wt%, need to go through more than 8 times of repeated impregnation-high temperature heat treatment, this process is easy to aggravate the thermal damage of alumina fibers, which is not conducive to further improving the mechanical properties of composite materials, and the cycle is long, the efficiency is low, and the process cost is high

Publication No. CN110590388A Chinese patent discloses a low-cost, high-efficiency alumina fiber-reinforced alumina composite material preparation method, which uses alumina slurry to brush, mold, and then dry and sinter to obtain a composite material, which overcomes the limitations of the above-mentioned preparation method. Insufficient, no need for multiple impregnation-high temperature heat treatment, high efficiency and good environmental protection, but there are still the following defects: it is difficult to form large and complex components by molding process; Final firing after demoulding; the mold needs to be resistant to high temperature, and needs a male and female mold, the process is complicated and the cost is high

[0004] Therefore, the continuous alumina fiber-reinforced composite materials prepared by the prior art have the following deficiencies: 1) The two-dimensional cloth layer composite material is mainly used, and since there is no reinforcing fiber between the layers, delamination failure is prone to occur during service; Three-dimensional composite materials can be prepared by densifying three-dimensional fiber braids with organic precursor solution, and the interlayer performance can be enhanced. However, the organic precursor solution is easy to cause chemical damage to the fiber during high temperature treatment, resulting in poor overall performance of the composite material.

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