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Research Article

Effect of cermet substrates characteristics on the microstructure and properties of TiAlN coating

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  • Received: 9 July 2020Revised: 20 September 2020Accepted: 24 September 2020Available online: 25 September 2020
  • The composition and structure of substrate material have an important influence on the coating performances, especially the bonding strength and coating hardness,which determines whether the coating can be used. In the paper, the TiAlN coating was deposited on the TC with 0-20wt.% WC by arc ion plating. The influence of cermet substrates characteristics on the structure and properties of TiAlN coating was researched. The results show that TiAlN coating deposited on TC substrates has columnar grain structure. With the increasing of WC, the strength ratio of I(111)/I(200) of TiAlN and the adhesion gradually increases. When there is no WC in the substrate, the preferred orientation of TiAlN coating is (200). As the contents of WC go up, the preferred orientation of TiAlN coating becomes (111) and (200). The biggest difference between the adhesion strength of coating and substrate is the microstructure and composition of the substrate. Scratching results show that the adhesion of TiAlN coating gradually increases from A1 to A5 respectively 53N, 52 N, 56 N, 65 N, 58 N. The coating on the TC substrate with 15wt.% WC has the highest H/E and H3/E2, which indicating the best wear resistance. The failure mechanisms of coated tools are coating peeling, adhesive wear, and abrasive wear. As the cutting speed increases, the amount ofthe flank wear increases, and the durability decreases accordingly. Accompanied by the increasing of WC, the flank wear of coated cermet insert decreases first and then increases. 
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Effect of cermet substrates characteristics on the microstructure and properties of TiAlN coating

  • Corresponding author:

    Ji Xiong    E-mail: 13668149296@163.com

  • School of Mechanical and Engineering, Sichuan University, Chengdu, 610065, China

Abstract: The composition and structure of substrate material have an important influence on the coating performances, especially the bonding strength and coating hardness,which determines whether the coating can be used. In the paper, the TiAlN coating was deposited on the TC with 0-20wt.% WC by arc ion plating. The influence of cermet substrates characteristics on the structure and properties of TiAlN coating was researched. The results show that TiAlN coating deposited on TC substrates has columnar grain structure. With the increasing of WC, the strength ratio of I(111)/I(200) of TiAlN and the adhesion gradually increases. When there is no WC in the substrate, the preferred orientation of TiAlN coating is (200). As the contents of WC go up, the preferred orientation of TiAlN coating becomes (111) and (200). The biggest difference between the adhesion strength of coating and substrate is the microstructure and composition of the substrate. Scratching results show that the adhesion of TiAlN coating gradually increases from A1 to A5 respectively 53N, 52 N, 56 N, 65 N, 58 N. The coating on the TC substrate with 15wt.% WC has the highest H/E and H3/E2, which indicating the best wear resistance. The failure mechanisms of coated tools are coating peeling, adhesive wear, and abrasive wear. As the cutting speed increases, the amount ofthe flank wear increases, and the durability decreases accordingly. Accompanied by the increasing of WC, the flank wear of coated cermet insert decreases first and then increases. 

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