Hydrothermal preparation method for aluminum oxide whiskers at low temperature

An alumina whisker and hydrothermal technology, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve problems such as high temperature and pressure, high equipment requirements, unfavorable operation, etc., to improve mechanical properties and purity High, high-conversion effects
CN101338448AInactive Publication Date: 2009-01-07QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
0 Cites 18 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
Publication Date
2009-01-07
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a preparation method of aluminum oxide whisker in the hydrothermal under low temperature. The preparation method comprises the procedures as follows: aluminum nitrate is dissolved in distilled water to prepare the solution with the concentration of 0.5 to 1.5mol / L; urea with the molar weight that is 2 to 10 times more than the aluminum nitrate is added into the aluminum nitrate solution and the solution is stirred until transparent clarified collosol is made; the collosol is placed in a reaction kettle for 6 to 12h under the temperature of 90 DEG C to 120 DEG C to obtain white deposit of the precursor of the alumina whisker; and the white deposit is washed by the distilled water and roasted for 2 to 12h under the temperature of 1100 DEG C to 1300 DEG C and the alumina whisker is made. The alumina whisker prepared by the invention is identified to be pure phase by x-ray diffraction. The average diameter of the alumina whisker is 0.5mum and the length of the alumina whisker is 5 to 10mum. The alumina whisker can be used as an additive for ceramic materials, function materials and metal materials, and the like, and well improve the mechanical property and the heat-resistant property of the materials.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of inorganic salt materials, and relates to a preparation process of an alumina whisker material, in particular to a method for preparing alumina whiskers under low-temperature hydrothermal conditions. Background technique

[0002] Whiskers refer to single crystal fiber materials with a diameter of several microns and a length of tens of microns. It has the characteristics of large aspect ratio, no grain (edge) boundary, and the number of defects is smaller than that of polycrystalline. It is precisely because of this intrinsic integrity that whiskers, whose strength is not strictly limited by their surface integrity, are endowed with very tough and non-brittle properties compared to polycrystalline fibers and glass fibers. At present, there are many kinds of whiskers, and aluminum oxide whiskers are one of them. It stands out for its excellent properties such as good mechanical strength, modulus of elasti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More