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Method for preparing carbon-fiber-toughened alumina ceramic material

An alumina ceramic and carbon fiber technology, applied in the field of ceramic materials, can solve the problems of high brittleness and low toughness of pure alumina, and achieve the effects of high densification, improved strength and toughness, and good application prospects.

Active Publication Date: 2018-01-16
LUDONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Alumina is an earlier researched ceramic material. The composite ceramic material based on alumina has excellent properties such as high hardness, high temperature resistance, wear resistance, and corrosion resistance. Therefore, it is widely used in metallurgy, chemical industry, machinery, electronics, etc. and aerospace and other fields; however, pure alumina has high brittleness and low toughness, how to solve this defect has become a hot spot that many domestic and foreign researchers have been studying.

Method used

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  • Method for preparing carbon-fiber-toughened alumina ceramic material

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Experimental program
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Embodiment 1

[0015] Embodiment 1: The raw materials are prepared according to the volume percentage of 85% alumina and 15% 2.5D woven carbon fiber; the weighed alumina is planetary reinforced ball milled for 180 h with deionized water as the medium and alumina as the ball. The surface pretreatment of 2.5D woven carbon fiber is carried out by low-temperature surface oxidation process. The process is as follows: the spray pressure is 0.1MPa, the hot air temperature at the inlet of the dryer is 380±30°C, the outlet temperature is 100±5°C, and the feed rate is 12±2ml / min, the nozzle diameter is 1.0mm; 2.5D woven carbon fiber is fixed in the graphite mold at four points with a small amount of 502 binder, evenly sieved into the ball-milled alumina powder, pre-pressed, and hot-pressed and sintered in vacuum The sintering temperature is 1500°C, the sintering pressure is 30MPa, and the sintering holding time is 30min; the sintered alumina / 2.5D woven carbon fiber ceramic material has a Vickers hardn...

Embodiment 2

[0016] Embodiment 2: Others are the same as in Embodiment 1, except that the raw materials are prepared according to the volume percentage of 92% alumina and 8% 2.5D woven carbon fiber; the sintering temperature is 1550°C, the sintering pressure is 35MPa, and the sintering holding time is 35min; The alumina / 2.5D woven carbon fiber ceramic material has a Vickers hardness of 18.1~19.3GPa, a bending strength of 580~600MPa, and a fracture toughness of 5.0~5.8MPa m 1 / 2 .

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Abstract

The invention belongs to the ceramic material field, and in particular relates to a method for preparing a high strength alumina-based ceramic material. The ceramic material is prepared from alumina and 2.5D woven carbon fiber as raw materials. The method is characterized in that in accordance with the ratio of 85-92% of the alumina and 8-15% by volume of the 2.5D woven carbon fiber, preparing theraw materials; pretreating the surface of the 2.5D woven carbon fiber, filling the 2.5D woven carbon fiber inn a die, and performing hot-pressing sintering in vacuum; wherein the sintering temperature is 1450-1550 DEG C, sintering pressure is 28-35 MPa, and heat preservation time is 30-35 min. The alumina / 2.5 D woven carbon fiber ceramic material prepared by the method has good room temperaturemechanical properties and high densification degree, and the strength and the toughness of the material are increased significantly compared with that of pure alumina prepared by a same process. Theceramic material has a good application prospect in the preparation of ceramic moulds, sand blasting nozzles, tools and other parts with high abrasion resistance requirements.

Description

technical field [0001] The invention belongs to the field of ceramic materials, in particular to a preparation method of a high-strength alumina-based ceramic material. Background technique [0002] 2.5D (dimension) weaving is a new type of weaving technology developed in recent years. It is an important branch of three-dimensional composite materials. The schematic diagram of its fiber preform structure (fiber cross-sectional diameter is micron level, fiber volume content can be changed) as shown in figure 1 shown. Interlocking is formed by intertwining between weft and warp yarns, and the fiber bundles are interwoven at a certain angle in the thickness direction, which enhances the connection strength between fabric layers; it avoids the poor interlayer performance of two-dimensional composite materials and the complicated process of three-dimensional braided composite materials It reduces the production cost, shortens the production cycle, and can meet the needs of fabri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/80
Inventor 刘长霞孙军龙张凤明
Owner LUDONG UNIVERSITY
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