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Preparation method of manganese cobalt nickel thermosensitive ceramic material

A technology of heat-sensitive ceramics, manganese-cobalt-nickel, applied in the field of preparation of manganese-cobalt-nickel heat-sensitive ceramic bulk materials, which can solve the problems of high sintering temperature, high energy consumption, and difficulty in overcoming the uniformity and stability of heat-sensitive materials

Inactive Publication Date: 2012-06-20
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The decomposition of nitric acid or sulfate in the preparation process of this method will damage the environment, the required sintering temperature is very high, and the energy consumption is large; another kind of heat-sensitive material directly prepared by the metal oxide mixed solid solution method is uniform Insurmountable flaws in sex and stability

Method used

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  • Preparation method of manganese cobalt nickel thermosensitive ceramic material
  • Preparation method of manganese cobalt nickel thermosensitive ceramic material
  • Preparation method of manganese cobalt nickel thermosensitive ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The atomic ratio of the three metals is Mn; Co: Ni=52:32:16 to carry out the weighing ratio of acetate (manganese acetate, cobalt acetate, nickel acetate), the solvent uses acetic acid, and the total metal ion concentration of the preparation is 0.5mol / L of acetate solution. Put the prepared solution in a beaker, put it on a constant temperature heating platform set at 220°C to evaporate, take out the solid precipitate after evaporation, put it in a mortar and grind it for 30 minutes, put the powder in a corundum crucible and put it in a horse Affixed to Fu Furnace figure 1 The heat treatment program for heat treatment. Take out the heat-treated powder, grind it in a mortar for 30 minutes, hold the pressure for 5 minutes at a pressure of 10 MPa, press it into a block embryo body, and then put the embryo body in a corundum crucible again and press it in a muffle furnace. attached figure 2 Calcination was performed with the indicated heat treatment program.

[0023]...

Embodiment 2

[0025] Carry out the weighing ratio of acetate (manganese acetate, cobalt acetate, nickel acetate) with three kinds of metal atomic ratios as Mn: Co: Ni=50:32:18, the solvent uses acetic acid, and the preparation total metal ion concentration is 0.5mol / L of acetate solution. Put the prepared solution in a beaker, put it on a constant temperature heating platform set at 220°C to evaporate, take out the solid precipitate after evaporation, put it in a mortar and grind it for 30 minutes, put the powder in a corundum crucible and put it in a horse Affixed to Fu Furnace figure 1 The heat treatment program for heat treatment. Take out the heat-treated powder, grind it in a mortar for 30 minutes, hold the pressure for 5 minutes at a pressure of 10 MPa, press it into a block embryo body, and then put the embryo body in a corundum crucible again and press it in a muffle furnace. attached figure 2 Calcination was performed with the indicated heat treatment program.

[0026] In the...

Embodiment 3

[0028] Carry out the weighing ratio of acetate (manganese acetate, cobalt acetate, nickel acetate) with three kinds of metal atomic ratios as Mn: Co: Ni=84:2:14, the solvent uses acetic acid, and the preparation total metal ion concentration is 0.5mol / L of acetate solution. Put the prepared solution in a beaker, place it on a constant temperature heating platform set at 220°C to evaporate, take out the solid precipitate after evaporation, put it in a mortar and grind it for 30 minutes, put the powder in a corundum crucible and put it on a horse Affixed to Fu Furnace figure 1 The heat treatment program for heat treatment. Take out the heat-treated powder, grind it in a mortar again for 30 minutes, hold the pressure at a pressure of 10 MPa for 5 minutes, press it into a block embryo body, and then put the embryo body in a corundum crucible again and press it in a muffle furnace. attached figure 2 Calcination was performed with the indicated heat treatment program.

[0029]...

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Abstract

The invention discloses a novel preparation method of a manganese cobalt nickel (Mn-Co-Ni-O) thermosensitive ceramic material. In the preparation method, acetate (manganese acetate) (Mn(CH3CO2)2.4H2O), cobalt acetate (Co(CH3CO2)2.4H2O) and nickel acetate (Ni(CH3CO2)2.4H2O) are taken as raw materials, acetate is taken as a solvent, and the manganese cobalt nickel thermosensitive ceramic material is prepared by evaporating, grinding, thermally processing, pressing, sintering and the like. The preparation method employs two thermally processing processes to ensure the compactness, the crystallinity, the corrosion resistance and other performance of the manganese cobalt nickel thermosensitive ceramic material; compared with the conventional preparation method of a manganese cobalt nickel blocky material, the preparation method of the invention has the advantages of: 1, the components of the manganese cobalt nickel thermosensitive ceramic material are good in uniformity, and the ratio of three metal positive ions of manganese, cobalt and nickel is easy to control; 2, the required sintering temperature is low; 3, the raw materials are environment-friendly, green and non-toxic, and low in preparation cost; and 4, the manganese cobalt nickel thermosensitive ceramic material is pure in crystalline phase and high in stability and reliability.

Description

technical field [0001] The invention relates to a heat-sensitive ceramic block material, in particular to a preparation method of a manganese-cobalt-nickel heat-sensitive ceramic block material. technical background [0002] Mn-Co-Ni-O is a negative temperature coefficient (NTC) thermistor material with a spinel structure, and its resistance value decreases exponentially with the increase of temperature. Thermistors occupy an extremely important position in temperature sensitive components, accounting for almost 40% of the total temperature sensitive components. The resistance-temperature characteristics of NTC thermosensitive materials can convert small temperature changes into resistance changes to form large signal outputs, especially suitable for high-precision measurement. As an important temperature sensing element, NTC thermistor materials are used in different fields. [0003] Manganese-containing spinel NTC thermistor materials have become the cornerstone of NTC m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/622
Inventor 吴敬黄志明侯云褚君浩
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI