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Etching agent for titanium carbonitride coating on surface of hard alloy cutter and method for using same

A technology of cemented carbide and titanium carbonitride, which is applied in the direction of material analysis using wave/particle radiation, preparation of test samples, and measuring devices, etc. It can solve the problems of not being able to track in time, making samples complicated, etc.

Inactive Publication Date: 2009-12-16
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. analyze
Although the current transmission electron microscope combined with the ion thinning method can obtain some information, the preparation of the sample is very complicated and cannot be tracked in time

Method used

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  • Etching agent for titanium carbonitride coating on surface of hard alloy cutter and method for using same
  • Etching agent for titanium carbonitride coating on surface of hard alloy cutter and method for using same
  • Etching agent for titanium carbonitride coating on surface of hard alloy cutter and method for using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Sample preparation: (1) Hot-press mounting: Take a sample (a TiCN hard-coated tool prepared by medium-temperature chemical vapor deposition method), and use phenolic resin powder as a filler to make a regular cylindrical test piece with a diameter of 30 mm on a hot-press mounting machine. In the same way, 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. 500r / min, the cooling water is continuously passed during the grinding process, and the sample must be fully ultrasonically cleaned between coarse and fine grinding (ultrasonic cleaning time in absolute ethanol for 2min) and dried in an oven at 100°C to remove Grits and oil stains. (3) Polishing: After the sample is ground and polished, it is polished with W2.5 diamond poli...

Embodiment 2

[0034] 1. Sample preparation: (1) Hot press mounting: Same as Example 1. (2) grinding: with embodiment 1. (3) polishing: same as embodiment 1.

[0035] 2. Preparation of etchant: Measure 35ml of concentrated HNO with a glass measuring cylinder 3 (mass fraction is 65%) and 10ml H 2 O was added to a plastic beaker, and then 10 ml of concentrated HF (45% by mass) was measured with a plastic measuring cylinder, added to the beaker, placed in a sonicator and sonicated for 2 minutes until the solution was evenly mixed.

[0036] 3. Etching operation: Etching is carried out as in Example 1, and the etching time is 30s.

[0037] figure 2 It is the cross-sectional morphology of the sample after etching. Compared with Example 1, the concentration of nitric acid in the etchant composition increases, and the etching time is the same. Comparing the morphology of Example 1, it can be found that the concentration of nitric acid in the etchant increases with the concentration of nitric ac...

Embodiment 3

[0039] 1. Sample preparation: Sample preparation: (1) Hot-press mounting: same as Example 1. (2) grinding: with embodiment 1. (3) polishing: same as embodiment 1.

[0040] 2. Preparation of etchant: Measure 40ml of concentrated HNO with a glass measuring cylinder 3 (mass fraction is 66%) and 10ml H 2 O was added to a plastic beaker, and then 10 ml of concentrated HF (45% by mass) was measured with a plastic measuring cylinder, added to the beaker, placed in a sonicator and sonicated for 2 minutes until the solution was evenly mixed.

[0041] 3. Etching operation: Etching is carried out as in Example 1, and the etching time is 30s.

[0042] image 3 It is the cross-sectional morphology of the sample after etching. In this example, the concentration of nitric acid in the etchant is further increased compared with Examples 1 and 2, and the etching time is still 30s. It can be found from the observation image that the etching depth is further deepened. The local grains of the...

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Abstract

The invention provides an etching agent for a titanium carbonitride coating on the surface of a hard alloy cutter and a method for using the same, and relates to a cutter coating etching agent, in particular to an etching agent formula for analyzing the microstructure of a MT-CVD titanium carbonitride coating on the surface of the hard alloy cutter and a method for using the same. The invention provides the etching agent for the titanium carbonitride coating on the surface of a hard alloy cutter, which can effectively show the microstructure of the MT-CVD titanium carbonitride coating on the surface of the hard alloy cutter, and a method using the same. The etching agent comprises the following components in portion by weight: 30 to 40 portions of nitric acid, 10 portions of hydrofluoric acid and 10 portions of water. The using method comprises the following steps of: sample preparation, namely hot-pressing, inserting, grinding and polishing; and etching operation, namely before etching, washing the sample, drying the sample, putting the sample in the etching agent for etching, taking the sample out, washing the sample, putting the sample in absolute ethyl alcohol for ultrasonic washing, drying the sample, storing the sample in a dryer and then observing the sample by a scanning electron microscope.

Description

technical field [0001] The invention relates to a tool coating etchant, in particular to an MT-CVD (moderate temperature chemical vapor deposition, medium temperature chemical vapor deposition) titanium carbonitride coating microstructure analysis on the surface of a cemented carbide tool Etchant formulations and methods of use. 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 higher requirements are put forward for the performance of cutting tools. Since the coating treatment of cutting tools is one of the important ways to improve the performance of cutting tools, the coating technology of cutting tools has made great 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 the...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N1/28G01N23/225
Inventor 王周成孙鹏祁正兵
Owner XIAMEN UNIV
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