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Spray granulation method of non-oxide ceramic powder

A non-oxide and spray granulation technology, applied in the field of non-oxide ceramic spray granulation, can solve the problems of high cost, high bonding strength, difficult preparation, etc., and achieves good granulation formability, high output and simple process. Effect

Inactive Publication Date: 2013-06-26
常熟佳合高级陶瓷材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] This type of ceramics is dominated by covalent bonds, has high bonding strength, and is not easy to prepare, or the preparation of high-performance products requires high costs, which is not conducive to large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put 850g of titanium carbide powder (D50=1.0μm), 20g of iron powder, 28.57g of aluminum powder, 48.57g of isobutylene polymer (molecular weight: 5500), 1457.14g of deionized water, and 24.29g of tetramethylammonium hydroxide into In the ball mill tank, ball mill for 8 hours to obtain a slurry with pH=9-10 and viscosity not greater than 6dpa.s. The slurry is sent to the centrifugal turntable of the spray drying granulator through a peristaltic pump, the rotation speed of the centrifugal turntable is 9600rpm, the temperature of the air inlet is 230oC, and the temperature of the air outlet is 140oC. After cooling, the pellets were collected and passed through an 80-mesh sieve to obtain pellets with a moisture content of 1.13%.

[0020] Fill the granulated material into the mold, and press it at 180MPa to obtain a sample of Φ60mm×6mm, with a density of 2.95g / cm 3 . Put it into a hot pressing mold, put it into a carbon tube furnace, and sinter at 1380oC for half an hour un...

Embodiment 2

[0023] Disperse 4900g of tungsten carbide powder (D50=3.37μm), 75.38g of carbon powder, 150.77g of aluminum phosphate, 50g of polyvinyl butyraldehyde, 50g of polyethylene glycol, 50.77g of polyacrylic acid, 2261.54g of deionized water, and disperse at high speed for 2 Hour. The slurry is sent to the centrifugal turntable of the spray drying granulator through the peristaltic pump, the rotation speed of the centrifugal turntable is 6400rpm, the temperature of the air inlet is 230oC, and the temperature of the air outlet is 130oC. After cooling, the pellets were collected and passed through an 80-mesh sieve to obtain pellets with a moisture content of 1.2%.

[0024] Fill the granulated material into the mold, and press 120MPa to form a sample of 30mm×30mm×6mm, with a density of 9.07g / cm 3 . Put it into a carbon tube furnace, heat press and sinter at 1350oC, 100MPa for 1 hour. The density of the sintered product is 15.52g / cm 3 .

[0025]

Embodiment 3

[0027] Boron carbide powder 1000g (D50=0.8μm), nickel powder 33.33g, polyvinyl alcohol 20g, polyethylene glycol 26g, polyacrylic acid 26.67g, aluminum phosphate 66.67g, deionized water 500g, high-speed stirring for 5 hours, viscosity Slurry not greater than 5dpa.s. The slurry is sent into the pressure spray drying tower through a peristaltic pump, the spray pressure is 2.0MPa, the air inlet temperature is 230oC, and the air outlet temperature is 130oC. After cooling, the granulated material was collected and passed through an 80-mesh sieve to obtain a spherical granulated material with a moisture content of 0.97%.

[0028] Fill the granulated material into the mold, and form it by isostatic pressing at 250MPa to obtain a sample of 60mm×60mm×6mm, with a density of 1.42g / cm 3 . Put it into a hot-pressing mold, put it into a carbon tube furnace, and heat-press and sinter at 1925oC and 25MPa for 1 hour. The density of the sintered product is 2.49g / cm 3 , hardness 3252HV0.3.

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Abstract

The invention discloses a spray granulation method of non-oxide ceramic powder. The spray granulation method specifically comprises the following steps of: step one. material blending, to be specific, blending 35%-65% of non-oxide powder, 0%-3% of carbon powder, 0%-4% of dispersing agent, 0.05%-4.5% of binder and 30%-60% of deionized water in percentage by weight: and step two. preparing the raw materials in the step one into stable ceramic slurry by adopting ball-milling, high-speed stirring or ultrasonic dispersion, wherein the viscosity of the obtained slurry is not more than 5dpa.s; and step three. spray-drying and pelleting, to be specific, controlling the feed rate of the slurry prepared in the step two through a peristaltic pump, adding the slurry to a spray-drying granulator, and obtaining boron carbide pelleting materials by controlling the inlet and outlet temperature and pressure of the slurry, wherein the solid content of the obtained slurry for spray granulation can reach 65wt%.

Description

technical field [0001] The invention relates to a method for spraying and granulating non-oxide ceramics, in particular to a method for spraying and granulating carbide ceramics. Background technique [0002] Non-oxide ceramics (such as carbides and nitrides) are a large class of important ceramics in advanced structural ceramics. They have superior performance, especially in special fields, and will play an increasingly important role in high-tech fields in the future. important role. Especially carbide ceramics, such as boron carbide, silicon carbide, tungsten carbide, chromium carbide, etc., have received more and more attention because of their high hardness, wear resistance and chemical corrosion resistance. They are widely used in abrasive tools and various corrosion-resistant containers. And pipelines, as well as mechanical industry bearings, cutting tools and mechanical seal components are used. [0003] This type of ceramics is mainly based on covalent bonds, has ...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/563C04B35/565C04B35/58C04B35/581C04B35/583C04B35/584C04B35/622
Inventor 张福军
Owner 常熟佳合高级陶瓷材料有限公司
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