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Preparation method of wear-resisting, corrosion-resistant and high temperature-resistant silicon carbide ceramic

A technology of silicon carbide ceramics and manufacturing methods, which is applied in the field of corrosion-resistant, high-temperature-resistant silicon carbide ceramics, and wear-resistant fields. It can solve the problems of fast scaling, temperature damage, and damage to nozzle materials, and achieve small porosity, compact structure, and The effect of high hardness

Inactive Publication Date: 2014-02-05
XIAN HUAHANG MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common causes that affect nozzle spray problems are: a) Corrosion and wear: the material on the surface of the nozzle orifice and the inner flow channel gradually becomes larger or deformed, which in turn affects the flow rate, pressure and spray shape; b) Corrosion: the chemical action of the spray liquid or the environment Cause corrosion to destroy the nozzle material; c) clogging: dirt or other impurities in the liquid block the nozzle mouth, thereby limiting the flow rate of the nozzle and interfering with the spray shape and its uniformity; d) sticking: caused by the evaporation of the liquid Splash, mist or chemical accumulation on the material inside or outside the edge of the nozzle mouth can leave a layer of dry solidified layer, blocking the nozzle mouth or internal flow channel; There are certain damage effects; f) incorrect installation: gaskets that deviate from the axis, over tightening or other position changing problems can have adverse effects; g) accidental damage: during installation and cleaning, due to the use of incorrect Tools may accidentally damage the nozzle
But the most important reason is corrosion, wear and temperature damage, so that the nozzle cannot be in good working condition for a long time
[0003] At present, in the metallurgical and steel rolling industries, the existing nozzles can no longer meet the use requirements under the working environment of 1500-1700°C high temperature and 150-200g / L nitric acid and 40-60g / L hydrofluoric acid mixed solution medium. There are disadvantages such as poor wear resistance, corrosion resistance and high temperature resistance, fast scaling, short service life, etc., and its service life is generally about 35 days

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The wear-resistant, corrosion-resistant, and high-temperature-resistant silicon carbide ceramic nozzle prepared in this example is used in metallurgy and steel rolling industries, and its working environment is a mixed solution medium of 1600°C high temperature, 150g / L nitric acid and 60g / L hydrofluoric acid environment.

[0020] Concrete preparation method is:

[0021] Step 1: Using silicon carbide micropowder and carbon black with a particle size of W10 as raw materials, prepare silicon carbide slurry, wherein the mass fraction of silicon carbide micropowder is 80%, and the mass fraction of carbon black is 20%; the silicon carbide slurry is prepared using The following steps: select an appropriate amount of grinding balls according to the weight ratio of raw materials and grinding balls as 1:1.5, grind the raw materials in the grinding cylinder for 20 hours; sieve after grinding, remove coarse particles with a fineness greater than W10, and then grind them in an oven ...

Embodiment 2

[0028] The wear-resistant, corrosion-resistant, and high-temperature-resistant silicon carbide ceramic nozzle prepared in this example is used in metallurgy and steel rolling industries, and its working environment is a mixed solution medium of 1500°C high temperature, 180g / L nitric acid and 50g / L hydrofluoric acid environment.

[0029] Concrete preparation method is:

[0030] Step 1: Using silicon carbide micropowder and carbon black with a particle size of W10 as raw materials, prepare silicon carbide slurry, wherein the mass fraction of silicon carbide micropowder is 85%, and the mass fraction of carbon black is 15%; the silicon carbide slurry is prepared using The following steps: select an appropriate amount of grinding balls according to the weight ratio of raw materials and grinding balls as 1:2.5, grind the raw materials in the grinding cylinder for 15 hours; sieve after grinding, remove coarse particles with a fineness greater than W10, and then grind them in an oven ...

Embodiment 3

[0037] The wear-resistant, corrosion-resistant, and high-temperature-resistant silicon carbide ceramic nozzle prepared in this example is used in metallurgy and steel rolling industries, and its working environment is a mixed solution medium of 1700°C high temperature, 200g / L nitric acid and 60g / L hydrofluoric acid environment.

[0038] Concrete preparation method is:

[0039] Step 1: Use silicon carbide micropowder and carbon black with a particle size of W10 as raw materials to prepare silicon carbide slurry, wherein the mass fraction of silicon carbide micropowder is 95%, and the mass fraction of carbon black is 10%; the silicon carbide slurry is prepared using The following steps: select an appropriate amount of grinding balls according to the weight ratio of raw materials and grinding balls as 1:2.0, grind the raw materials in the grinding cylinder for 18 hours; sieve after grinding, remove coarse particles with a fineness greater than W10, and then grind them in an oven ...

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PUM

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Abstract

The invention discloses a preparation method of wear-resisting, corrosion-resistant and high temperature-resistant silicon carbide ceramic. The preparation method comprises the following steps: firstly, preparing a silicon carbide sizing agent, a silicon carbide ceramic original blank and a silicon carbide ceramic regenerated blank; then, processing the silicon carbide ceramic regenerated blank and silicon powder under a special condition to obtain a silicon carbide ceramic blank; and finally, mechanically processing the blank. A silicon carbide ceramic spray nozzle product obtained by the method is dense in structure, small in porosity and high in hardness, and has a service life capable of reaching over 60 days greatly exceeding that of the existing spray nozzle under a high temperature of 1500 DEG C-1700 DEG C and mixed liquor medium working environment of 150g / L-200g / L nitric acid and 40g / L-60g / L hydrofluoric acid. Under the normal temperature, wear resistance of the silicon carbide ceramic spray nozzle product is also 500 times that of common steel.

Description

technical field [0001] The invention relates to the technical field of preparing silicon carbide ceramics, in particular to a method for manufacturing silicon carbide ceramics with wear resistance, corrosion resistance and high temperature resistance. Background technique [0002] Nozzles are one of the key components of spraying, spraying, fuel injection, sandblasting, spraying and other equipment, and are widely used in textile, electronics, pharmaceutical, food, garbage disposal, petroleum, chemical, and steel industries. Nozzles are designed to work under many different spray conditions in order to achieve the best spray performance in use. The material selection of the nozzle is generally determined according to the chemical properties of the bath. Bronze casting or plastic die-casting can be used for non-corrosive baths. To prevent corrosion, non-metallic materials can be used, such as sulfuric acid, hydrochloric acid and other strong corrosive baths. , Nylon plastic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622C04B35/66
Inventor 华增功华金
Owner XIAN HUAHANG MATERIALS TECH