Method used for furnace-free normal-temperature direct sintering preparation of metal composite oxide powder with electric current heat effect

A metal composite and oxide powder technology, applied in the field of materials, can solve the problems of low energy utilization rate, large hardware investment, and long preparation time, and achieve the effect of high energy utilization rate, small hardware investment, and short preparation time

Active Publication Date: 2019-11-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to avoid the deficiencies of the existing technology, the present invention proposes a method of directly sintering metal composite oxide powders by using current heating effect at room temperature without a furnace, which solves the problem of large hardware investment in the preparation of various metal composite oxide powders at present. , long preparation time, high energy consumption, low energy utilization rate and high cost, this technology has the characteristics of small hardware investment, simple and fast process, energy saving and low cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Furnaceless rapid preparation of magnesia-aluminum spinel (MgO·Al 2 o 3 ) powder

[0039] Step 1MgCO 3 and Al 2 o 3 Weighing of powder: according to spinel (MgO·Al 2 o 3 ) composition, respectively weighed 42.00 grams of magnesium carbonate powder with a particle size of 50 to 500 nm and 7.91 grams of aluminum oxide nanopowder with a particle size of 5 to 50 nm, and mixed the two together uniformly to obtain magnesium carbonate powder and 49.91 grams of the mixture of aluminum oxide nanopowder.

[0040] Step 2 Preparation of water-soluble metal salt saturated solution: Weigh 0.5 grams of NaCO 3 and 0.5 g of KCl were dissolved in 7.0 ml and 2.0 ml of distilled water at 4°C, and stirred evenly with a magnetic stirrer to obtain NaCO 3 and a saturated solution of KCl.

[0041] Step 3 powder calcined body molding: NaCO prepared in step 2 3 Add the saturated solution of KCl and magnesium carbonate to the mixed powder raw material of magnesium carbonate an...

Embodiment 2

[0044] Example 2: Rapid preparation of mullite (3Al 2 o 3 2SiO2 2 ) powder

[0045] Step 1 aluminum nitrate (Al(NO 3 ) 3 ) and silicon dioxide (SiO 2 ) powder weighing: according to mullite (3Al 2 o 3 2SiO2 2 ) composition, weighing 37.59 grams of aluminum nitrate ultrafine powder with a particle size of 5 to 50 nm and 14.76 grams of silicon dioxide ultrafine powder with a particle size of 5 to 50 nm, and uniformly mixing them together to obtain aluminum nitrate and 52.36 grams of mixed powder of silicon dioxide.

[0046] Step 2 Preparation of saturated solution of water-soluble metal salt: Weigh 1.05 g of LiCl respectively, dissolve in 1.7 ml of distilled water at 25°C, add 1.0 mol / L hydrochloric acid to adjust the pH to 3 until the solution is clear, and stir with a magnetic stirrer Homogenously, a clear saturated solution of LiCl was obtained.

[0047] Step 3 Powder calcined body molding: add all the LiCl saturated solution prepared in step 2 to the powder raw mat...

Embodiment 3

[0050] Example 3: Rapid preparation of mullite (3Al 2 o 3 2SiO2 2 ) powder

[0051] Step 1Al 2 (SO 4 ) 3 and SiO 2 Weighing of powder: Weigh 30.00 grams of ultrafine powder of aluminum sulfate with a particle size of 100 to 500 nm and 3.51 grams of ultrafine powder of silicon oxide with a particle size of 5 to 100 nm, and mix them uniformly to obtain 33.51 grams of mixed powder of aluminum sulfate and silicon dioxide.

[0052] Step 2 Preparation of water-soluble metal salt saturated solution: weigh 2.68 grams of CaCl 2 , at 40°C, dissolved in 2.7ml of distilled water and stirred evenly to obtain a clear CaCl 2 solution.

[0053] Step 3 powder calcined body molding: the CaCl prepared in step 2 2 Add all the solution to the powder raw material weighed in step 1, and add distilled water to adjust the water content to 30%, stir the mixed powder raw material containing water until it is uniform, and then dry the wet mixed powder raw material at 40°C until it contains The...

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Abstract

The invention relates to a method used for furnace-free normal-temperature direct sintering preparation of metal composite oxide powder with electric current heat effect. Compared with the prior metalcomposite oxide preparation art, the advantages are that: no expensive high temperature furnace equipment is needed; pre-heating of samples is not needed; preparation of a plurality of metal composite oxides at room temperature can be realized; sintering time is short; efficiency is high; hardware investment is low; energy utilization efficiency is high; suitable application range is wide; technology is simple; energy saving effect is excellent; and cost is low. The method is suitable for large scale preparation of metal composite oxide powder materials, and is promising in application prospect.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a method for directly sintering metal composite oxide powders by using electric current thermal effect at room temperature without a furnace, in particular to a method for rapidly preparing metal composite oxides without a heating furnace and by direct reaction using electric current thermal effect at normal temperature Method for powder materials. Background technique [0002] Metal composite oxides are generally a type of multi-element complex oxides formed by combining or reacting two or more metal oxides. Metal composite oxides generally have richer crystal structures and properties than unit metal oxides containing only one metal element. There are many crystal structure types of different metal composite oxides, such as the composite oxide of perovskite structure: BaTiO 3 、FeYO 3 , SrFeO 3 、LaCrO 3 , CaZrO 3 etc., scheelite type composite oxide: CaCrO 4 , BaCrO 4 et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/14C01B13/18C01F7/02C01B33/26C01G23/00C01G33/00C01G25/00C01G37/14C01G49/00C01G51/00C01G19/00C01G41/00C01G39/00
CPCC01B13/145C01B13/185C01F7/162C01B33/26C01G23/006C01G33/00C01G25/006C01G37/14C01G49/00C01G51/40C01G19/00C01G41/00C01G39/00C01P2004/61Y02P20/10
Inventor 李焕勇王乾张春辉黄欢欢唐琦
Owner NORTHWESTERN POLYTECHNICAL UNIV
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