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Preparation method for calcium titanate whiskers

A technology of calcium titanate and whiskers, which is applied in the field of preparation of new inorganic functional materials, can solve problems such as the preparation of calcium titanate whiskers that have not yet been seen, and achieves the effects of being suitable for industrialization and application, with little environmental pollution and good microscopic appearance.

Inactive Publication Date: 2015-04-15
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the relevant research at home and abroad mainly focuses on the preparation and application of calcium titanate powder and granular materials, and there is no literature report on the preparation of calcium titanate whiskers.

Method used

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  • Preparation method for calcium titanate whiskers
  • Preparation method for calcium titanate whiskers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 A preparation method of calcium titanate whiskers, comprising the following steps:

[0021] ⑴Add 2.22g calcium-containing raw material—anhydrous calcium chloride (CaCl 2 ), 0.80g titanium-containing raw material - titanium dioxide (TiO 2 ), 0.15g mineralizer - lead acetate (Pb(CH 3 COO) 2 ·3H 2 O) Grind them separately until the particle size is 60 mesh, and mix them evenly to obtain the reaction raw materials.

[0022] Among them: the molar ratio of the titanium element in the titanium-containing raw material to the calcium element in the calcium-containing raw material is 1:2; the mass of the mineralizer accounts for 5% of the total mass of the calcium-containing raw material and the titanium-containing raw material (the compound containing crystal water converted to pure substance calculation).

[0023] (2) Put the reaction raw materials into a 25mL corundum crucible, place in a muffle furnace, raise the temperature to 830°C at a heating rate of ...

Embodiment 2

[0027] Example 2 A preparation method of calcium titanate whiskers, comprising the following steps:

[0028] ⑴Add 2.22g calcium-containing raw material—anhydrous calcium chloride (CaCl 2 ), 0.88g titanium-containing raw material - titanium dioxide (TiO 2 ), 0.25g mineralizer - lead acetate (Pb(CH 3 COO) 2 ·3H 2 O) Grind them separately until the particle size is 60 mesh, and mix them evenly to obtain the reaction raw materials.

[0029] Among them: the molar ratio of the titanium element in the titanium-containing raw material to the calcium element in the calcium-containing raw material is 1.1:2.0; the mass of the mineralizer accounts for 8% of the total mass of the calcium-containing raw material and the titanium-containing raw material (the compound containing crystal water converted to pure substance calculation).

[0030] (2) Put the reaction raw materials into a 25mL corundum crucible, place in a muffle furnace, raise the temperature to 800°C at a heating rate...

Embodiment 3

[0034] Example 3 A preparation method of calcium titanate whiskers, comprising the following steps:

[0035] ⑴Add 2.22g calcium-containing raw material—anhydrous calcium chloride (CaCl 2 ), 0.96g titanium-containing raw material - titanium dioxide (TiO 2 ), 0.32g mineralizer - lead acetate (Pb(CH 3 COO) 2 ·3H 2 O) Grind them separately until the particle size is 60 mesh, and mix them evenly to obtain the reaction raw materials.

[0036] Among them: the molar ratio of the titanium element in the titanium-containing raw material to the calcium element in the calcium-containing raw material is 1.2:2.0; the mass of the mineralizer accounts for 10% of the total mass of the calcium-containing raw material and the titanium-containing raw material (the compound containing crystal water converted to pure substance calculation).

[0037] (2) Put the reaction raw materials into a 25mL corundum crucible, place in a muffle furnace, heat up to 815°C at a heating rate of 8°C / min, ...

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Abstract

The invention relates to a preparation method for calcium titanate whiskers. The method comprises the following steps: (1) respectively grinding a calcium-containing raw material, a titanium-containing raw material and a mineralizer to enable the particle size to be 60 mesh, and obtaining reacting raw materials after uniform mixing; (2) placing the reacting raw materials in a corundum crucible, placing the corundum crucible on a muffle, setting multi-stage warming and constant-temperature procedures, warming to 800-830 DEG C at a warming speed of 5-10 DEG C / min, calcining for 1-2.5h at constant temperature, cooling to 760-785 DEG C after 30 min or 60 min, maintain at the constant temperature for 1.5-4h, and obtaining sintering products after natural cooling; (3) adding deionized water in the sintering products, performing thermostatic waterbath soaking for 2-3h at 80 DEG C, performing suction filtration after repeated washing through the deionized water, and obtaining off-white solid pressed powder; and (4) performing blast drying on the solid pressed powder to constant weight, and obtaining the off-white calcium titanate whisker products. The preparation method is simple in process and low in cost, the production rate is about 70-75%, the obtained off-white calcium titanate whisker products are good in microcosmic appearance and high in purity, can be separated from the crucible easily and are small in industrial pollution, the mineralizer is removed easily, and the calcium titanate whisker products have application values.

Description

technical field [0001] The invention relates to the technical field of preparation of novel inorganic functional materials, in particular to a preparation method of calcium titanate whiskers. Background technique [0002] Whisker is a fibrous crystalline material grown in the form of a single crystal, which usually does not contain defects (grain boundaries, dislocations, holes, twins, etc.) that exist in conventional powder materials. The arrangement is highly ordered, and the mechanical strength is approximately equal to the force between adjacent atoms, so the strength is close to the theoretical value of a complete crystal. The highly oriented structure of whiskers not only makes it have high strength, high modulus and high elongation, but also may show better performance in electricity, light, magnetism, dielectric, heat conduction, superconductivity, etc., which can be used It can be used as a reinforcement for ceramic matrix, metal matrix, and polymer matrix composit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/32C30B29/62C01G23/00
Inventor 乃学瑛张永兴魏明边绍菊李武
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI