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Hard alloy cutter surface coating etchant and application method thereof

A cemented carbide and surface coating technology, applied in the field of alloy cutting tools, can solve the problems of complex sample production and inability to track in time.

Inactive Publication Date: 2014-07-16
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Metallographic microscope, scanning and transmission electron microscope can be used to observe the microstructure of the coating. Since the grain size of the coating prepared by vapor deposition is submicron, the optical microscope with low resolution cannot be used for the microstructure of the coating. analysis; although the current transmission electron microscope combined with ion thinning method can obtain some information, but the preparation of samples is very complicated and cannot be tracked in time

Method used

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  • Hard alloy cutter surface coating etchant and application method thereof
  • Hard alloy cutter surface coating etchant and application method thereof
  • Hard alloy cutter surface coating etchant and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Sample preparation: (1) Hot-press mounting: Take the sample (alumina hard-coated tool prepared by high-temperature chemical vapor deposition method), and use phenolic resin powder as filler to make a regular cylinder with a diameter of 30mm on a hot-press mounting machine For the sample, the molding temperature is 130°C, and the pressure is kept for 5 minutes. (2) Grinding: The inlaid samples are fully coarsely ground and finely ground on 600 mesh and 1200 mesh diamond grinding wheel discs respectively, and the time of coarse and fine grinding is controlled at about 5 minutes. The temperature is 500r / min, and the cooling water is continuously passed during the grinding process. The sample should be fully ultrasonically cleaned between coarse and fine grinding (ultrasonic cleaning time in anhydrous ethanol for 2min) and dried in an oven at 100°C to remove abrasive particles. crumbs and oil.

[0022] (3) Polishing: After the sample is ground, it is polished with W2.5 ...

Embodiment 2

[0027] 1. Sample preparation: (1) Hot press mounting: Same as Example 1. (2) grinding: with embodiment 1. (3) polishing: same as embodiment 1.

[0028] 2. Preparation of etchant: measure 35ml of concentrated HNO with a glass measuring cylinder 3 , 5ml concentrated HCl and 10ml H 2Add O into a plastic beaker, then use a plastic measuring cylinder to measure 10ml of concentrated HF, add it to the beaker, put it in an ultrasonic machine and sonicate for 2 minutes until the solution is evenly mixed.

[0029] 3. Etching operation: Etching is carried out as in Example 1, and the etching time is 30s.

[0030] figure 2 It is the cross-sectional morphology of the sample after etching. Compared with Example 1, the volume of concentrated hydrochloric acid in the etchant composition increases, but the etching time is reduced to 30s. Compared with the morphology of Example 1, it is found that the coating shows The area of ​​the prismatic structure increases, and some grain boundaries...

Embodiment 3

[0032] 1. Sample preparation: (1) Hot press mounting: Same as Example 1. (2) grinding: with embodiment 1. (3) polishing: same as embodiment 1.

[0033] 2. Preparation of etchant: Measure 35ml of concentrated HNO with a glass measuring cylinder 3 , 5ml concentrated HCl and 10ml H 2 Add O into a plastic beaker, then use a plastic measuring cylinder to measure 10ml of concentrated HF, add it to the beaker, put it in an ultrasonic machine and sonicate for 2 minutes until the solution is evenly mixed.

[0034] 3. Etching operation: Etching is carried out as in Example 1 for 40 s.

[0035] image 3 It is the cross-sectional morphology of the sample after etching. The volume of hydrochloric acid in the etchant in this example has increased compared with Example 1. Compared with Example 2, the etching time has increased to 40s. It can be clearly observed from the figure The irregular prismatic grains of the alumina coating and the columnar crystal growth method can also effective...

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Abstract

The invention discloses a hard alloy cutter surface coating etchant and an application method of the hard alloy cutter surface coating etchant, and relates to an alloy cutter. The etchant consists of HNO3, HCl, HF and H2O according to a volume ratio of 35: (0-10): 10: (5-15) of the HNO3 to the HCl to the HF to the H2O. The application method comprises the following steps: preparing a hard alloy coated cutter sample into a cylindrical sample, taking phenolic resin powder as an enchasing filler, molding the sample and taking out, sequentially grinding, washing with ultrasonic wave, drying, polishing and washing with ultrasonic wave again; washing the sample with ultrasonic wave by use of deionized water, subsequently washing with absolute ethyl alcohol, drying, putting the sample into the hard alloy cutter surface coating etchant for etching, taking out after etching, swashing with water, then putting the sample into the absolute ethyl alcohol to wash with ultrasonic wave again, baking, drying, and observing through a scanning electron microscope to obtain a coated microscopic structure. The hard alloy cutter surface coating etchant can be used for effectively displaying an HT-CVD (Chemical Vapor Deposition) aluminum oxide coated microscopic structure on the surface of a hard alloy cutter so as to achieve the aims of displaying the size and structure of coating grains and distinguishing grain boundaries of the coating grains.

Description

technical field [0001] The invention relates to an alloy cutting tool, in particular to an etchant for the surface coating of a hard alloy cutting tool and a method for using the same. Background technique [0002] With the popularization of CNC machine tools and machining centers, high-efficiency, high-speed, and high-precision cutting has become the main development direction of modern processing technology, and correspondingly higher requirements are put forward for the performance of cutting tools. Tool coating is one of the important ways to improve tool performance. Tool coating technology has made significant progress in recent years. The surface coating of cutting tools is mainly achieved by two deposition processes, physical vapor deposition and chemical vapor deposition. Among them, chemical vapor deposition coating is still the main coating process of indexable inserts. MT-CVD (medium temperature chemical vapor deposition) has been developed. Deposition) titaniu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32
Inventor 王周成张倍源吴正涛
Owner XIAMEN UNIV
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