Preparation method of aluminum oxide ceramic continuous fiber

A technology of alumina ceramics and continuous fibers, applied in the direction of artificial filaments made of inorganic materials, can solve the problems of no longer dense fibers, voids in fibers, and reduced strength

Active Publication Date: 2013-03-13
SHANDONG UNIV
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Problems solved by technology

[0006] The main shortcomings of the current alumina fiber preparation methods are as follows: First, in the process of preparing aluminum sol, most of the polymer spinning aids are added, and the volatilization of the calcined products of the polymer will easily cause voids in the fiber, the fiber is no longer dense, and the strength is reduced; The second is that the alumina fibers are mostly mullite phase, and the alumina content is mostly below 75%. Research on chemical sol-gel technology and dry spinning technology is in the exploratory stage

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  • Preparation method of aluminum oxide ceramic continuous fiber
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  • Preparation method of aluminum oxide ceramic continuous fiber

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Embodiment Construction

[0009] A method for preparing alumina ceramic continuous fibers, comprising the following steps:

[0010] ⑴ aluminum salt (AlCl 3 ·6H 2 O and Al(NO 3 ) 3 9H 2 (2) and aluminum isopropoxide are added to the dilute nitric acid solution, and grain inhibitors are optionally added, refluxed and stirred until the solution is transparent, then heated at 75 to 90°C, and aluminum powder is added, reacted until the aluminum powder is completely dissolved, The transparent solution is aged in a water bath at 60°C until the viscosity is 50-900Pa·s to obtain a sol; wherein,

[0011] Aluminum salt (AlCl 3 ·6H 2 O and Al(NO 3 ) 3 9H 2 The mass ratio of the total amount of O) to aluminum isopropoxide is (1.4~3.1):1, wherein AlCl in the aluminum salt 3 ·6H 2 O and Al(NO 3 ) 3 9H 2 The mass ratio of O is (1.3~1):(1~3); the mass ratio of aluminum salt to aluminum powder is (1.5~6):1, and the amount of grain inhibitor added accounts for 0~4% of the total weight of raw materials.

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Abstract

The invention relates to a preparation method of aluminum oxide ceramic continuous fiber, which comprises the following steps of: preparing a sol spinnable precursor by use of inorganic aluminum salt, aluminum powder, aluminum isopropoxide, nitric acid and crystal grain inhibitor; spinning gel fiber by a dry spinning technology; and performing drying and high-temperature calcination to obtain the aluminum oxide ceramic continuous fiber with diameter of 10-60 microns. According to the invention, the prepared sol system is particularly stable, the cost of the raw materials is low, and the preparation process is simple; and the filament can be obtained without adding auxiliaries such as macromolecules and the like. The filamentation environment is mild in the dry spinning. The calcined ceramic continuous fiber has flexibility and can be used as reinforcement in a composite material to improve strength and heat resistance of the material.

Description

technical field [0001] The invention relates to a preparation method of alumina ceramic continuous fiber, which belongs to the technical field of inorganic fiber. Background technique [0002] Alumina ceramic continuous fiber is a highly valued high-performance inorganic fiber. It not only has high tensile strength, but also has high temperature resistance, corrosion resistance, low deformation, low thermal conductivity, and strong thermal shock resistance. , low porosity and unique electrical properties. Its raw materials are metal oxides, inorganic salts, water, polymers, viscose or gel, etc.; compared with inorganic fibers such as Nicalon and carbon fibers, its manufacturing cost is much lower. With its high cost performance and huge commercial value, alumina ceramic fiber has attracted many countries to research, develop and utilize it. [0003] The British ICI company uses the Bunemen method to produce alumina short fibers named Saffil. Its service temperature can reac...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08C04B35/10
Inventor 陈代荣杨苗苗焦秀玲
Owner SHANDONG UNIV
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