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TiCN series nanometer gradient compound multi-layer coating and method for preparing same

A multi-layer coating and nano-composite technology, which is applied in coatings, metal material coating processes, layered products, etc., can solve problems such as low hardness, increased fracture toughness, and poor toughness

Inactive Publication Date: 2010-05-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

in TiC x N 1-x Among the components (where, X=0-1), TiC has the highest hardness (HV3300-4000) and the lowest thermal expansion coefficient (7.8×10 -6 / °C), but this composition is very brittle and has poor toughness; TiN has the lowest hardness (HV1900-2400) and the highest thermal expansion coefficient (8.3×10 -6 / °C), but this composition has the best toughness, Al 2 o 3 -In TiC-TiN-based cermets, the fracture toughness of the material increases with the increase of TiN content (Lu Hongxian, Xu Zhou, Jiang Mingxue. High temperature system Al 2 o 3 Preparation and properties of -TiC-TiN based cermet[J]

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Surface treatment of cemented carbide blade

[0029] The preparation method of TiCN series nano-gradient composite multilayer coating applied to ring-shaped cemented carbide blades for rail processing includes the following steps and process conditions:

[0030] (1) Blade pretreatment: Put the blade in a "Qianli" brand alkaline metal cleaning solution and boil the surface for 30 minutes to remove oil; place the blade in an ultrasonic cleaning machine (frequency 40kHz) filled with alkaline metal cleaning solution at room temperature. Treat for 5 minutes; put the cleaned blades in pure ethanol solution for dehydration and place them in an oven at 120°C for 60 minutes;

[0031] (2) Blade preheating: Put the pre-processed blade into the BD 802088BE vacuum coating furnace produced by Balzers, and vacuum up to 5×10 -3 After Pa, add Ar gas to maintain a vacuum of 1-4×10 -1 Pa, start the HCD electron gun and the heating device in the furnace; control the HCD electron gun cur...

Embodiment 2

[0037] Example 2 High-Co content high-speed steel fir-tree milling cutter (Ф25) re-coated after grinding

[0038] The milling cutter is used to process the root groove of the steam turbine rotor. The original milling cutter is imported from Japan SG milling cutter. After use, the cutting edge is re-grinded, and the surface is coated with a TiCN series nano-gradient composite multi-layer coating, including the following steps and process conditions :

[0039] (1) Milling cutter pretreatment: place the milling cutter in the "Qianli" brand alkaline metal cleaning liquid and boil the surface for 120 minutes to remove oil; place the milling cutter in an ultrasonic cleaner filled with alkaline metal cleaning liquid at room temperature (frequency 40kHz ) Ultrasonic treatment for 5 minutes; put the cleaned milling cutter into a pure ethanol solution for dehydration and place it in an oven at 120°C for 60 minutes;

[0040] (2) Milling cutter pre-heating: Load the pre-treated milling cutter i...

Embodiment 3

[0046] Example 3 Surface treatment of cold work die steel SKD1 alloy test piece

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Abstract

The invention discloses a TiCN series nanometer gradient compound multi-layer coating and a method for preparing the same. On hard-metal alloy, iron based tools with the Rockwell hardness of over HRC60 or a mould matrix, a TiN film, a gradient change Ti(CxN1-x) film and a TiCN film are coated in sequence to form the nanometer gradient compound multi-layer coating with a structure of TiN / Ti(CxN1-x) / Ti(CN), wherein the x is between 0 and 0.5. The method for preparing the coating comprises the steps of surface pre-treatment, pre-heating, surface washing and etching, preparation of a transition layer, preparation of a gradient layer, preparation of a surface layer and the like. The hardness HV of the coating prepared by the method reaches 28 to 32GPa, and the same matrix binding force of the coating is over 55N, the same matrix binding force and wear resistance of the TiCN series coating are improved, and the working efficiency and the service life of the tools and the mould are also improved.

Description

Technical field [0001] The invention relates to coatings for tools and moulds, in particular to a TiCN series nano-gradient composite multilayer coating and a preparation method thereof. The TiCN series nano-gradient composite multilayer coating is specifically TiN / Ti(C x N 1-x ) / Ti(CN) gradient nanocomposite multilayer coating. Background technique [0002] The demand of advanced manufacturing industry puts forward strict requirements on the surface coating technology of tools and molds: high hardness, high wear resistance, high precision, high production efficiency, environmental protection, etc. Since chemical vapor deposition (CVD) was used to prepare TiN in the tool field in the 1970s, research results have shown that some of the N atoms in TiN can be replaced by C atoms to form TiC with similar crystal structure. x N 1-x Components (where X = 0-1), as the carbon content increases, the hardness increases correspondingly. Considering the wear resistance and impact toughness o...

Claims

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Application Information

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IPC IPC(8): B32B9/00C23C14/30C23C14/06C23C14/02C23C14/58C23C14/54
Inventor 彭继华
Owner SOUTH CHINA UNIV OF TECH
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