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Preparation method for controllable nitriding-physical vapor deposition (PVD) composite coating of high-speed steel tool

A technology of composite coating and high-speed steel, which is applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of high nitrogen content in the nitriding layer, high nitrogen potential, and affecting the toughness of the cutting edge

Active Publication Date: 2020-01-07
台州普拉帝涂层有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These conventional nitriding processes are difficult to meet the stringent requirements of high-speed steel cutting tools on the nitriding process: first, the compound layer and nitrogen-containing supersaturated diffusion layer have high hardness and high brittleness, and the nitrided layer is thick. Therefore, the cutting edge of high-speed steel The brittleness increases and the toughness decreases; secondly, high-speed steel contains a large amount of alloying elements such as W and Cr, which belong to strong nitrogen elements. During the nitriding process, the superficial layer of high-speed steel is easy to form grain boundary structure, and the grain boundary structure is M7C3 And other types of alloy carbides, brittle carbides form cracks under the impact of external loads, resulting in a significant decrease in the toughness and fatigue strength of the nitriding layer; thirdly, the conventional nitriding process often uses ammonia or nitrogen for glow heating, which is bound to The pre-nitriding treatment of the tool makes it difficult to control the nitriding process of the high-speed steel tool, or uses argon glow heating, and the high-energy argon ions passivate the cutting edge of the tool under the action of an external high-voltage electric field; finally, conventional nitriding The high nitrogen potential of the process makes the nitrogen content in the nitriding layer high, which affects the toughness of the cutting edge

Method used

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  • Preparation method for controllable nitriding-physical vapor deposition (PVD) composite coating of high-speed steel tool
  • Preparation method for controllable nitriding-physical vapor deposition (PVD) composite coating of high-speed steel tool
  • Preparation method for controllable nitriding-physical vapor deposition (PVD) composite coating of high-speed steel tool

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The 16mm M2 high-speed steel end mills purchased in the market are subjected to degreasing and degreasing ultrasonic cleaning, sandblasting and ultrasonic ethanol cleaning, and drying, and then put the cleaned samples into a bell-type ion nitriding furnace. Turn on the mechanical pump, pump the vacuum in the furnace to 1Pa, and then carry out glow heating with argon and hydrogen. Argon and ammonia, the flow of argon and ammonia is precisely regulated, the nitrogen potential in the furnace is controlled within 0.35, and the nitriding time is 7 minutes; 15 minutes, 20 minutes and 180 minutes. After the nitriding is completed, cool down to room temperature with the furnace to obtain the nitrided high-speed steel cutting tool. The results show that there is no compound layer in the nitriding layer of the samples in the four states, and there is a serious grain boundary structure in the sample nitriding for 180 min, and the nitrided layer is abnormally thick, while the sampl...

Embodiment 2

[0029] The samples with a nitriding time of 20 minutes and the unnitrided samples were selected as research materials, and the nitrided samples were prepared under the nitriding process of the case. Then, the vacuum annealing experiment was carried out on the single PVD coating sample and the low nitrogen potential precision controllable nitriding-PVD composite coating sample at 700 ° C, kept for 2 hours, and then cooled to room temperature with the furnace. Then use a microhardness tester to test the hardness of the sample surface under different loading conditions, and the test results are as follows figure 2 shown. The research results show that within the test load range, the surface hardness of the low nitrogen potential precision controllable nitriding-PVD composite coating is always higher than that of a single PVD coating. Even under a load of 1000g, the coating hardness still reaches nearly 1100HV, more The hardness of the low nitrogen potential precision controllab...

Embodiment 3

[0031] The 16mm M2 high-speed steel end mills purchased in the market are subjected to degreasing and degreasing ultrasonic cleaning, sandblasting and ultrasonic ethanol cleaning, and drying, and then put the cleaned samples into a bell-type ion nitriding furnace. Turn on the mechanical pump, pump the vacuum in the furnace to 1Pa, and then carry out glow heating with argon and hydrogen. Argon and ammonia, the flow rate of argon and ammonia is precisely regulated, the nitrogen potential in the furnace is controlled within 0.35, and the nitriding time is 7min, 15min, 20min and 180min. After the nitriding is completed, cool down to room temperature with the furnace to obtain the nitrided high-speed steel cutting tool.

[0032] Put the nitrided high-speed steel tool into alcohol and acetone, clean it with ultrasonic waves for 30 minutes, then dry the cleaned sample with an air gun and place it on the substrate holder in the furnace cavity. Turn on the mechanical pump and the mole...

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Abstract

The invention discloses a high-performance high-speed steel tool with a gas low-nitrogen potential precision controllable nitriding-physical vapor deposition (PVD) composite coating. A tool substrateis a high-speed steel substrate, and a structure is a tempered martensite structure; a low-nitrogen potential precision controllable nitriding layer mainly contains a nitrogen-containing unsaturated martensite structure, alloy nitride, an alloy nitride and carbon compound and alloy carbide, does not contain a compound layer and a crystal boundary structure or a vein structure; and the nitriding layer and the PVD coating are both a common AlCrN coating.

Description

technical field [0001] The invention relates to a high-performance high-speed steel low nitrogen potential precision controllable nitriding-PVD composite coating, in particular to a low nitrogen potential precision controllable nitriding-PVD composite coating tool and a preparation method thereof. Background technique [0002] With the rapid development of modern manufacturing industry, more and more products require machining such as cutting, milling and drilling. The annual consumption of various cutting tools in our country is more than 20 billion yuan, and the performance of cutting tools directly affects the quality of products and the life of cutting tools. At present, during the processing of high-speed steel tools, the tool is faced with high cutting force and cutting vibration, and there is severe friction, wear and thermal shock between the cutting edge of the cutting tool tip and the workpiece to be processed, and the processing temperature of the cutting edge of ...

Claims

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Application Information

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IPC IPC(8): C23C8/38C23C14/02C23C14/06
CPCC23C8/38C23C14/02C23C14/0641
Inventor 徐兰英
Owner 台州普拉帝涂层有限公司
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