Method for assisting in laser engineered net shaping of Al2O3-based eutectic ceramic cutter through ultrasound

A technology of laser near-net shaping and ceramic cutting tools, which is applied in the field of cutting tool manufacturing, can solve problems such as poor fracture toughness, achieve the effect of reducing porosity and avoiding pseudo-eutectic structure

Active Publication Date: 2016-09-21
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] In order to solve the poor fracture toughness of traditional ceramic tools and Al 2 o 3 The basic eutectic ceramic tool is prone to problems such as cracks, pores and pseudo-eutectic structure in the process of laser near-net forming. The present invention provides an ultrasonic-assisted laser near-net forming Al 2 o 3 The method of cutting tools based on eutectic ceramics can not only improve the toughness and strength of traditional ceramics, but also avoid many defects such as cracks, pores and pseudo-eutectic structures due to the ultrasonic assistance in the forming process.

Method used

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  • Method for assisting in laser engineered net shaping of Al2O3-based eutectic ceramic cutter through ultrasound

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using Nd:YAG solid-state continuous laser and ultrasonic auxiliary device 2 o 3 and ZrO 2 The powder is subjected to laser near-net forming, and the specific forming steps are as follows:

[0023] A. Polish the platform 3 of the ultrasonic generating device with sandpaper, clean it with acetone, ethanol, and deionized water in sequence, and dry it, and select Al with a diameter of 40-90 μm 2 o 3 and ZrO 2 Powder, put the powder in an electric blast drying oven and dry at 100°C for 4 hours, adjust the ultrasonic platform 3 so that the powder flow focus of the coaxial powder feeding is on the surface of the substrate, and at the same time ensure that the powder flow focus coincides with the laser spot to maximize To improve the powder utilization rate, and then Al 2 o 3 and ZrO 2 The powder is put into the two powder cylinders of the powder feeder respectively;

[0024] B. Turn on the ultrasonic generator 4, search for the resonance frequency of the ultrasonic vib...

Embodiment 2

[0028] Using Nd:YAG solid-state continuous laser and ultrasonic auxiliary device 2 o 3 Laser near-net forming with SiC powder, the specific forming steps are as follows:

[0029]A. Before the experiment, the platform 3 of the ultrasonic generating device was polished with sandpaper, washed with acetone, ethanol, and deionized water in sequence, and dried, and Al with a diameter of 40-90 μm was selected. 2 o 3 and SiC powder, put the powder in an electric blast drying oven and dry at 100°C for 5 hours, adjust the ultrasonic platform 3 so that the powder flow focus of the coaxial powder feeding is on the surface of the substrate, and at the same time ensure that the powder flow focus coincides with the laser spot, so as to Maximize powder utilization, then put the ceramic powder into the powder cylinder of the powder feeder;

[0030] B, turn on the ultrasonic generator 4, search the resonance frequency of the ultrasonic vibration system in the 20~22kHz frequency range, observ...

Embodiment 3

[0034] Using Nd:YAG solid-state continuous laser and ultrasonic auxiliary device 2 o 3 and Si 3 N 4 The powder is subjected to laser near-net forming, and the specific forming steps are as follows:

[0035] A. Before the experiment, the platform 3 of the ultrasonic generating device was polished with sandpaper, washed with acetone, ethanol, and deionized water in sequence, and dried, and Al with a diameter of 40-90 μm was selected. 2 o 3 and Si 3 N 4 Powder, put the powder in an electric blast drying oven and dry at 100°C for 4 hours, adjust the ultrasonic platform 3 so that the powder flow focus of the coaxial powder feeding is on the surface of the substrate, and at the same time ensure that the powder flow focus coincides with the laser spot to maximize Maximize the powder utilization rate, and then put the ceramic powder into the powder cylinder of the powder feeder;

[0036] B. Turn on the ultrasonic generator 4, search for the resonance frequency of the ultrasonic...

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Abstract

The method provides a method for assisting in laser engineered net shaping of an Al2O3-based eutectic ceramic cutter through ultrasound. Al2O3 and another kind of ceramic powder are placed in two powder cylinders of a powder feeder, inert gas serves as powder feeding and protective gas, and high-energy laser beams melt ceramic powder injected into a molten pool. By means of pre-adjustment of an ultrasonic device and real-time change of assisting ultrasound power, the equivalent effect of ultrasound on the molten pool is achieved. By means of the cavitation phenomenon of ultrasound, micro-bubbles in the molten pool float and are separated from the molten pool, and the porosity of a eutectic ceramic cutter material is effectively reduced. Due to the ultrasonication theory and the supercooling nucleation theory, a eutectic fiber structure is influenced to grow opposite to the heat flux direction, so thick dendritic crystal is converted into afterbirth-like crystal, and the eutectic spacing of the eutectic ceramic cutter material can reach nanoscale. The method can effectively inhibit material performance degradation caused by cracks and slow growth of a ceramic cutter material at high temperature, and an ultrasonic-assisted system can effectively refine grains, reduce porosity and effectively prevent cracks.

Description

technical field [0001] The invention relates to a cutting tool manufacturing technology, in particular to an ultrasonic-assisted laser near net shape Al 2 o 3 A method based on eutectic ceramic cutting tools. Background technique [0002] Ceramic cutting tools are widely used in the field of high-speed dry cutting because of their high hardness, high temperature resistance, good corrosion resistance and oxidation resistance. However, ceramic knife materials have poor strength and toughness due to their physical properties and chemical bond characteristics, which has become a bottleneck in the application of ceramic knives. The eutectic ceramic tool material eliminates the amorphous phase at the interface of traditional ceramic tool materials, improves the degree of structure and compactness, enhances the uniform distribution of phases, firmly combines the phase interface, and has strong anisotropy. On the basis of enhancing the toughness of traditional ceramic tools , the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/653
CPCC04B35/10C04B35/653C04B2235/3826C04B2235/3873C04B2235/5236C04B2235/5436C04B2235/665C04B2235/667
Inventor 吴东江闫帅沈忱牛方勇马广义
Owner DALIAN UNIV OF TECH
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