High-performance SiC/W metal ceramic composite nozzle and preparation method thereof

A metal-ceramic composite, high-performance technology, applied in the field of ceramic composite materials, can solve the problems of reduced temperature resistance of metal-ceramics, unsuitable food equipment, low product yield, etc., to reduce friction, easy control, green body strong effect

Active Publication Date: 2017-07-28
山东宝纳新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention adopts compression molding, and the density of the product is not uniform when pressed, and it is easy to cause cracking and deformation during the sintering process, and the product yield is low.
Chinese patent document CN105755344A (application number 201610111138.8) provides a silicon carbide cermet composite material and its preparation method, in which the addition of metal tungsten and chromium is relatively large, and the cost is high, and the sintering temperature of the product is 2100-2300 ° C, which can high power consumption
Chinese patent document CN102373357A (application number is 201010260203.6) discloses a cermet composition, wherein metal powders such as tungsten powder, iron powder and chromium powder are added to the components. Although the addition of these metal powders reduces the melting point, the cost is relatively high , and the temperature resistance of cermets is significantly reduced
In addition, coal tar is added to the cermet composition, and coal tar contains a large amount of benzene, toluene, xylene, nitrogen, sulfur, etc., which is harmful to human body and pollutes the environment, so it is not suitable for food equipment

Method used

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  • High-performance SiC/W metal ceramic composite nozzle and preparation method thereof
  • High-performance SiC/W metal ceramic composite nozzle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A high-performance SiC / W cermet composite nozzle, made by injection molding and sintering silicon carbide feed particles as raw material; the silicon carbide feed particle raw material is composed of the following components in mass percentage: %, boron carbide 3%, titanium diboride 3%, tungsten 1%, carbon black 2%, graphite 1%, paraffin 10%, high-density polyethylene 5%, ethylene vinyl acetate copolymer 2%, stearic acid 1 %.

[0046] Silicon carbide feed particles were prepared as follows:

[0047] Proportionally, take silicon carbide micropowder, boron carbide, titanium diboride, tungsten, carbon black, graphite and stearic acid and mix them evenly and add them to water. The amount of water added is silicon carbide, boron carbide, titanium diboride, tungsten , carbon black, graphite and stearic acid are 2 to 3 times the total amount of stearic acid, using silicon carbide balls as the grinding medium, and milling for 10 to 12 hours; after ball milling, the mixed slurr...

Embodiment 2

[0056] With the high-performance SiC / W cermet composite nozzle described in Example 1, the difference is that the silicon carbide feed particle raw material is composed of the following components by mass percentage: silicon carbide micropowder 70%, boron carbide 4 %, titanium diboride 1%, carbon black 3%, graphite 3%, tungsten 2%, paraffin 8%, high-density polyethylene 4%, ethylene vinyl acetate copolymer 3%, stearic acid 2%.

[0057] Silicon carbide feed particles were prepared as described in Example 1.

[0058] The preparation steps of high-performance SiC / W cermet composite nozzle are as follows:

[0059] (1) Injection molding: Add silicon carbide feed particles into the DRV4-55T injection molding machine, and inject molding under the conditions of injection pressure 110MPa and injection temperature 180°C to obtain a SiC / W cermet composite nozzle body;

[0060] (2) Drying: drying the obtained nozzle body at 40°C for 20 hours;

[0061] (3) Degreasing: Two-step degreasing...

Embodiment 3

[0066] The same as the high-performance SiC / W cermet composite nozzle described in Example 1, the difference is that the silicon carbide feed particle raw material is composed of the following components in mass percentage: silicon carbide fine powder 65%, boron carbide 5% %, titanium diboride 2%, tungsten 1.5%, carbon black 4%, graphite 3%, paraffin 9%, high-density polyethylene 5%, ethylene vinyl acetate copolymer 4%, stearic acid 1.5%.

[0067] Silicon carbide feed particles were prepared as described in Example 1.

[0068] The preparation steps of high-performance SiC / W cermet composite nozzle are as follows:

[0069] (1) Injection molding: Add silicon carbide feed particles into the DRV4-55T injection molding machine, and inject molding under the conditions of injection pressure 100MPa and injection temperature 170°C to obtain a SiC / W cermet composite nozzle body;

[0070] (2) Drying: drying the obtained nozzle body at 45°C for 18 hours;

[0071] (3) Degreasing: a two-s...

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Abstract

The invention relates to a high-performance SiC / W metal ceramic composite nozzle which is prepared by adopting silicon carbide feeding particles, performing injection molding and sintering. The silicon carbide feeding particles are composed of, by mass, 60-80% of silicon carbide micropowder, 1-5% of boron carbide, 1-5% of titanium diboride, 0.5-5% of tungsten, 1-5% of carbon black, 1-5% of graphite, 5-15% of paraffin, 2-6% of high-density polyethylene, 2-6% of ethylene-vinyl acetate copolymer and 1-3% of stearic acid. The composite nozzle is obtained by introducing enhancing particles into silicon carbide feeding and combining with the method, free silicon content is reduced, wear resistance and mechanical performance of metal ceramic are improved, and service life of the nozzle is prolonged greatly; the composite nozzle is high in production efficiency, low in cost and supportive of continuous production.

Description

technical field [0001] The invention relates to a high-performance SiC / W cermet composite nozzle for a starch separator and a preparation method thereof, belonging to the field of ceramic composite materials. Background technique [0002] For the separation nozzle of the starch separator, certain corrosion resistance, wear resistance, strength, toughness and long service life are required. Therefore, when selecting a nozzle, its manufacturing material should not only have excellent wear resistance, but also have excellent anti-vibration performance and a long service life. The current starch processing mostly uses imported equipment from abroad, and the nozzles in these equipment are all made of monolithic alloys, which are expensive. Some domestic manufacturers have modified these nozzles and changed the nozzles to alloy nozzles inlaid with stainless steel shells. Although part of the cost has been reduced, the structure has not changed, and low life and high energy consu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/626C04B35/634C08B30/04
CPCC04B35/62615C04B35/62635C04B35/62695C04B35/63408C04B35/63416C04B2235/3813C04B2235/3821C04B2235/404C04B2235/424C04B2235/425C04B2235/77C04B2235/96C08B30/04
Inventor 翟彦霞李兆敏张玉军狄聚泽刘欢甄风磊
Owner 山东宝纳新材料有限公司
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