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Preparation method of special-shaped boron carbide ceramic sandblast nozzle

A boron carbide ceramic and sandblasting nozzle technology, applied in the field of sandblasting nozzles, can solve the problems of inability to grind, low efficiency and high cost

Inactive Publication Date: 2015-05-20
NINGBO VULCAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Boron carbide is a typical superhard material, the efficiency of grinding is very low, so the cost of grinding is very high
[0007] In addition, it is impossible to prepare and grind sandblasting nozzles with small hole diameters (diameter below 3mm, that is, the radius of the sandblasting hole is smaller than the grinding allowance)
For sandblasting nozzles with multiple holes, eccentric holes (holes not in the center of the sandblasting nozzle) and non-circular holes (such as oval, square and other unconventional sandblasting holes), the processing capacity of the grinding equipment is not sufficient, or the grinding cost Extremely high, or impossible to grind at all
Therefore, the current technology can only prepare boron carbide ceramic sandblasting nozzles with simple shapes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 600 grams of boron carbide micropowder, 300 grams of titanium boride micropowder, 27 grams of nano-carbon black, 5 grams of dispersant (tetramethylammonium hydroxide), 6 grams of adhesive (dextrin), and 2000 grams of deionized water into the quick In the ball mill, the pulp is made by ball milling, and then the granulated material is obtained through spray granulation. The obtained granulated material is put into the designed fine-hole mold, and the green body of the sandblasting nozzle is formed, and the green body is put into the debonding furnace. Heat at 500°C for 3 hours to remove moisture and organic matter, then put it into a vacuum sintering furnace for pressureless sintering, hold at 2100°C for 1 hour, and cool with the furnace. Finally, the outer circle and both ends are ground to obtain a pressureless sintered boron carbide ceramic sandblasting nozzle with a sandblasting hole diameter of 0.5mm.

Embodiment 2

[0033] Add 550 grams of boron carbide micropowder, 350 grams of titanium carbide micropowder, 40 grams of nano-carbon black, 6 grams of dispersant (ammonia), 5 grams of adhesive (polyvinyl alcohol), and 2100 grams of deionized water into a fast ball mill, and ball mill Slurry, and then spray granulation to obtain granulated material, the obtained granulated material is put into the designed square hole mold, and the sandblasting nozzle green body is formed, and the green body is put into the debonding furnace and kept at a temperature of 800 ℃ Remove moisture and organic matter for 3 hours, then put it into a vacuum sintering furnace for pressureless sintering, hold at 2120°C for 1 hour, and cool with the furnace. Finally, the outer circle and both ends are ground to obtain a pressureless sintered boron carbide ceramic sandblasting nozzle, and the product contains square sandblasting holes.

Embodiment 3

[0035] Add 650 grams of boron carbide micropowder, 310 grams of zirconium carbide micropowder, 40 grams of water-soluble phenolic resin, 3 grams of dispersant (ammonia water), 5 grams of adhesive (polyvinyl alcohol), and 2000 grams of deionized water into a fast ball mill, and ball mill Slurry, and then spray granulation to obtain granulated material, the obtained granulated material is put into the designed six-hole mold, and the sandblasting nozzle green body is formed, and the green body is put into the debonding furnace at a temperature of 650 ℃ Insulate for 3 hours to remove moisture and organic matter, then put it into a vacuum sintering furnace for pressureless sintering, hold at 2010°C for 1.5 hours, and cool with the furnace. Finally, the outer circle and both ends are ground to obtain a pressureless sintered boron carbide ceramic sandblasting nozzle, which contains six sandblasting holes.

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PUM

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Abstract

The invention discloses a preparation method of a special-shaped boron carbide ceramic sandblast nozzle. The preparation method comprises the following steps: (1) proportioning all the raw materials in percentage by weight as follows: 50-70wt% of boron carbide powder, 20-40wt% of a sintering aid, 1-8wt% of a carbon source, 0.5-6wt% of an adhesive and 0.6-6wt% of a dispersing agent; (2) carrying out a spray drying granulation process on the obtained slurry into granules; (3) putting the granules into a manufactured soft mould sleeve and moulding by using a dry bag type granules method, thus obtaining a sandblast nozzle biscuit; (4) putting the sandblast nozzle biscuit into a debonding furnace, vacuumizing, heating for removing water and organics, then processing in a vacuum sintering furnace to obtain a finished boron carbide ceramic sandblast nozzle product. The method is suitable for volume production and the prepared boron carbide sandblast nozzle has the advantages of high hardness, good toughness, good wear resistance, long service life, low cost, and high performance cost ratio. The method can be used for preparing sandblast nozzle products with complicated hole structures.

Description

Technical field: [0001] The invention relates to the technical field of sandblasting nozzles, in particular to a method for preparing a pressureless sintered special-shaped boron carbide ceramic sandblasting nozzle. Background technique: [0002] The sandblasting machine is a device that uses compressed air as the power to form a high-speed jet beam to spray the spray material onto the surface of the workpiece at high speed. It is used to clean impurities, oxide layers, oil stains, etc. on the surface of the workpiece, and can improve the surface hardness and fatigue resistance of the substrate. Enhance the adhesion and durability between workpieces and coatings such as paint and plating, and are widely used in shipbuilding, ship repair, containers, machinery, steel structures, bridges, trains, automobiles and other fields. [0003] The sandblasting nozzle is a key part of the sandblasting machine, which is a consumable item that withstands the strong abrasion of the sprayin...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/622
Inventor 邬国平焦永峰孙雪萍谢方民
Owner NINGBO VULCAN TECH CO LTD
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