The method that porous ceramics is prepared with activated alumina presoma

The method that porous ceramics is prepared with activated alumina presoma

  • CN 104,311,095 B
  • Filed: 09/25/2014
  • Issued: 09/22/2017
  • Est. Priority Date: 09/25/2014
  • Status: Active Grant
First Claim
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1. a kind of method that porous ceramics is prepared with activated alumina presoma, it is characterised in that:

  • Including Liang Ge workshop sections, the first workSection prepares presoma, organic dispersing agent and short ceramic fibre is added into the solution being made into inorganic aluminate and water, after being uniformly dispersedGeneration precipitation in precipitant solution is added on, then adds ceramic powder and stirs evenly, filtration washing obtains presoma;

    Second workshop section with porcelain,Shaping, dry, sintering, presoma is well mixed with organic bond, be molded, dry after formation high intensity green compact, Ran HouAtmosphere sintering in two steps in high temperature furnace, first step reducing atmosphere or inert atmosphere, first with 2-9 DEG C/min programming rate literFrom 300 DEG C 800 DEG C are risen to 300 DEG C, then with 0.3-3 DEG C/min programming rate, then with 1-7 DEG C/min programming rateSintering temperature is risen to from 800 DEG C;

    Second step uses oxidizing atmosphere instead, and 1-6h is incubated at a sintering temperature;

    Sintering temperature is in 1200-Between 1600 DEG C;

    Described inorganic aluminate, including acid mineral aluminium salt and the class of basic mineral aluminium salt two, acid mineral aluminium salt includeAluminum nitrate, aluminium chloride, aluminum sulfate, alum, its precipitating reagent include ammoniacal liquor, sodium hydroxide, ammonium carbonate, sodium carbonate, bicarbonateSodium, ammonium hydrogen carbonate, sodium metaaluminate;

    Basic mineral aluminium salt includes sodium metaaluminate and potassium metaaluminate, and its precipitating reagent includes hydrochloric acid, sulphurAcid, nitric acid, acetic acid, formic acid, and acid mineral aluminium salt;

    Acid mineral aluminum salt solution concentration is 0.1-1.5 mol/L, alkaline nothingMachine aluminum salt solution concentration is 0.4-5.0 mo1/L, and the ratio of inorganic aluminate and precipitating reagent is according to the pH value of precipitation reaction Mother liquorDetermined between 7-10;

    Described ceramic powder includes:

    High temperature alumina, flint clay, kaolinite, quartz, feldspar, talcum, siliconLime stone, olivine, spinelle, zirconium oxide, yittrium oxide, calcium carbonate, magnesia, dolomite, particle diameter are that l0 nanometers -30 are micro-Rice, often adds 100g inorganic aluminates correspondence and adds 10g-100g ceramic powders.

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