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Preparation method of yttrium tungstate powder as negative expanding material

A negative expansion material, yttrium tungstate technology, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of unsuitability for large-scale production, complex synthesis process, high equipment requirements, etc., to achieve the purity of green products, Simple synthesis process and simple equipment requirements

Inactive Publication Date: 2014-07-30
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the existing yttrium tungstate preparation methods have their own advantages, there are still many problems, such as complex synthesis process, uneven reaction, high requirements for equipment, waste liquid generation, not suitable for large-scale production, etc.

Method used

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  • Preparation method of yttrium tungstate powder as negative expanding material
  • Preparation method of yttrium tungstate powder as negative expanding material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of the present embodiment comprises the following steps:

[0024] Step 1. Mix 22.6g of yttrium oxide powder and 69.6g of tungsten trioxide powder evenly by wet ball milling, dry and grind to obtain a raw material mixture; the wet ball milling method is: add yttrium oxide powder and tungsten trioxide After adding ethanol to the tungsten powder, wet mix it in a planetary ball mill for 3 hours, the ball-to-material ratio of the planetary ball mill is 5:1, and the rotating speed is 300r / min;

[0025] Step 2. The raw material mixture described in step 1 is placed in a muffle furnace for roasting treatment, and after being cooled in the furnace, it is crushed and ground to obtain a roasted product; the temperature of the roasting treatment is 1100° C., and the time is 9 hours;

[0026] Step 3, placing the roasted product described in step 2 in a muffle furnace for secondary roasting, crushing and grinding after cooling with the furnace, to obtain a seco...

Embodiment 2

[0030] The preparation method of the present embodiment comprises the following steps:

[0031] Step 1. Mix 11.3g of yttrium oxide powder and 34.8g of tungsten trioxide powder evenly by wet ball milling, dry and grind to obtain a raw material mixture; the method of wet ball milling is: add yttrium oxide powder and tungsten trioxide After adding ethanol to the tungsten powder, wet mix it in a planetary ball mill for 4 hours, the ball-to-material ratio of the planetary ball mill is 4:1, and the rotating speed is 180r / min;

[0032] Step 2. The raw material mixture described in step 1 is placed in a muffle furnace for roasting treatment, and after being cooled in the furnace, it is crushed and ground to obtain a roasted product; the temperature of the roasting treatment is 1200° C., and the time is 10 hours;

[0033] Step 3, placing the roasted product described in step 2 in a muffle furnace for secondary roasting, crushing and grinding after cooling with the furnace, to obtain a ...

Embodiment 3

[0037] The preparation method of the present embodiment comprises the following steps:

[0038] Step 1. Mix 11.3g of yttrium oxide powder and 34.8g of tungsten trioxide powder evenly by wet ball milling, dry and grind to obtain a raw material mixture; the method of wet ball milling is: add yttrium oxide powder and tungsten trioxide After adding ethanol to the tungsten powder, wet mix it in a planetary ball mill for 2 hours, the ball-to-material ratio of the planetary ball mill is 6:1, and the speed is 400r / min;

[0039] Step 2. The raw material mixture described in step 1 is placed in a muffle furnace for roasting treatment, and after being cooled in the furnace, it is crushed and ground to obtain a roasted product; the temperature of the roasting treatment is 1050° C., and the time is 8 hours;

[0040] Step 3, placing the roasted product described in step 2 in a muffle furnace for secondary roasting, crushing and grinding after cooling with the furnace, to obtain a secondary ...

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Abstract

The invention discloses a preparation method of yttrium tungstate powder as a negative expanding material. The method comprises the steps of firstly, uniformly mixing yttrium oxide powder and tungsten trioxide powder by using a wet-process ball milling method, and grinding after drying to obtain a raw material mixture; secondly, carrying out roasting treatment on the raw material mixture in a muffle furnace, breaking and grinding after furnace cooling to obtain a roasted product; thirdly, carrying out secondary roasting treatment on the roasted product in the muffle furnace, breaking and grinding after furnace cooling to obtain a second roasted product; and fourthly, screening the second roasted product by using a 80-400 mesh sieve, and extracting undersize to obtain the yttrium tungstate powder. According to the invention, yttrium oxide and tungsten trioxide are used as raw materials, and the yttrium tungstate powder is prepared through solid phase reaction and a two-step sintering method; the preparation method is low in required production equipment requirement, simple in process flow and low in production cost; in addition, the preparation method is free of generating pollutants, environment-friendly and relatively high in product purity in the preparation process.

Description

technical field [0001] The invention belongs to the technical field of preparation and synthesis of inorganic non-metallic materials, and in particular relates to a preparation method of negative expansion material yttrium tungstate powder. Background technique [0002] Negative expansion material refers to the opposite of the "thermal expansion and contraction" phenomenon of ordinary materials. When heated, the material will shrink in volume and expand when cooled, that is, it has the "Negative Thermal Expansion" (Negative Thermal Expansion, NTE for short) effect. . Negative expansion materials can be used alone in some occasions that require cold expansion and heat contraction, or can be combined with other materials to form low-expansion composite materials with precise and controllable thermal expansion coefficients, which can be used in fields with special requirements for thermal expansion properties of materials. For example, in the extremely cold and extremely hot e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00
Inventor 林小辉梁静郑欣喻吉良李来平
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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