Novel fiber toughened alumina ceramic and preparation method thereof

The invention relates to the technical field of alumina ceramics, and discloses a novel fiber toughened alumina ceramic. The novel fiber toughened alumina ceramic comprises the following components in parts by weight: 70-90 parts of alpha-alumina, 20-30 parts of titanium dioxide, 20-30 parts of mullite fiber, 5-10 parts of a dispersant, 3-7 parts of a sintering aid, 2-5 parts of a lubricant, 2-5 parts of a plasticizer and 1-3 parts of a binder. The toughness of the mullite fibers is improved by soaking and modifying the mullite fibers, and the modified mullite fibers are pre-laid to form an effective toughened whole, so that the overall toughness is greatly enhanced after the alumina ceramic is fired, and in the preparation process, a combined dispersing agent is adopted, so that the toughness of the alumina ceramic is greatly improved. The dispersing effect of the alpha-aluminum oxide powder is further enhanced, the alpha-aluminum oxide powder can enter the mold conveniently, and through cooperation of the l