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Method for preparing laminated ceramic nozzle based on stress wave theory

A ceramic nozzle and stress wave technology, applied in spray guns, manufacturing tools, metal processing equipment, etc., can solve the problems of large wear at the nozzle inlet and outlet, reduce the service life of ceramic nozzles, etc. Erosion wear resistance and improved service life

Active Publication Date: 2018-01-16
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, during the use of ceramic nozzles, compared with the middle of the nozzle, the wear of the nozzle inlet and outlet is still relatively large, which reduces the service life of the ceramic nozzle to a certain extent.

Method used

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  • Method for preparing laminated ceramic nozzle based on stress wave theory

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Embodiment 1

[0016] Embodiment one: according to 85%B 4 C +13%TiC +2%Y 2 o 3 and 88%B 4 C +10% Al 2 o 3 +2%Y 2 o 3 The mass ratio of the laminated material is weighed, 40%B 4 The mass ratio of C+60%WC-Co is weighed to take the material of the middle layer of the nozzle; the weighed mixed powder is respectively used as the medium of deionized water and alumina as the grinding ball for planetary strengthening ball milling for 150 h. Dry in a vacuum oven, and pass the mixed powder through a 200-mesh sieve. Calculate the mass of each layer according to the mixing theoretical density, layer thickness, and inner and outer diameters of the nozzles of each laminated material, according to figure 1 The stacking sequence and the number of layers shown are flattened in the graphite mold, the layers are pre-pressed and placed in a vacuum sintering furnace, the sintering temperature is 1850°C, the sintering pressure is 32MPa, and the sintering holding time is 50min; the sintered laminated ceram...

Embodiment 2

[0017] Embodiment two: other is with embodiment one, difference is according to 90%B 4 C +8% TiC +2% Y 2 o 3 and 83%B 4 C+15%Al 2 o 3 +2%Y 2 o 3 The mass ratio of the laminated material is weighed, 30%B 4 The mass ratio of C+70%WC-Co weighs the material of the middle layer of the nozzle; the sintering temperature is 1880°C, the sintering pressure is 35MPa, and the sintering holding time is 55min; the Vickers hardness at the inlet and outlet of the sintered laminated ceramic nozzle material is 27.5~28.2GPa , The equivalent bending strength of the overall front of the nozzle is 750~877MPa.

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Abstract

The invention belongs to the technical field of nozzles, and in particular relates to a method for preparing a laminated ceramic nozzle based on a stress wave theory. The method is characterized in that the inlet of the nozzle comprises 9 layers of a laminated material, and the outlet of the nozzle comprises 7 layers of the laminated material. The laminated material comprises boron carbide, titanium carbide, aluminum oxide and yttrium oxide as raw materials, the mass of each the laminated material layer is calculated according to the mixed theoretic density and the thickness of the laminated material layer and the inner diameter and the outer diameter of the nozzle, the laminated material layers are spread in a graphite mould according to the laminating sequence and the number of the layers, the laminated material layers are prepressed layer by layer, and put into a vacuum sintering furnace, temperature is 1850-1900DEG C, pressure is 30-35MPa, and heat insulation time is 40-60min. Through the establishment of a mathematical model of the stress wave propagation theory, material parameters for reducing abrasive material impact can be selected, the anti erosion performance of the ceramic nozzle is improved, due to thermal expansion coefficient difference between the laminated layer at the inlet and the laminated layer at the outlet, residual compressive stress is formed at the outlet and the inlet of the nozzle after hot pressed sintering, and tensile stress of the nozzle during blasting process can be alleviated, so that the laminated ceramic nozzle prepared by the method hasgood erosive wear resistance and wear resistance, and the service life is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of nozzles, in particular to a method for preparing laminated ceramic nozzles based on stress wave theory. The ceramic sandblasting nozzle prepared by the method can be widely used in the fields of surface cleaning, surface strengthening, surface modification and the like. Background technique [0002] The steel plates used in the manufacturing process of large ships and aircraft carriers, and the pressure pipes used to transport oil, etc. are generally treated by sandblasting before spraying, that is, sand abrasives are sprayed onto the surface of the object to be processed by air to achieve the purpose of surface treatment. During the use of sandblasting nozzles, due to the extremely harsh environment and short service life, sandblasting nozzles are required to have high hardness and wear resistance, as well as certain strength and toughness. At present, the materials for making nozzles at home and abro...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/622C22C29/06B24C5/04
Inventor 孙军龙刘长霞张凤明
Owner LUDONG UNIVERSITY
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