Micro/nano-scale TiN reinforcing composite coatings fabricated by pre-nitriding+cladding treatments

Wang Weifu; Hu Xiaole

Composite coatings with micro/nano scale TiN reinforcing phases were successfully fabricated by pre-nitriding+pulse laser cladding treatments on TC4 substrate surface. A comparative research on microstructures and mechanical properties were carried out between the pre-nitriding+cladding(PNC) composite coatings and the conventional laser gas nitriding(LGN) samples. The results showed that the PNC composite coatings were composed of TiN and ' martensite. With the contents of N in powder mixtures augmenting, the hardness increased gradually. Comparative analysis indicated that, the hardness properties of the PNC composite coatings were equivalent with that of LGN samples. In addition, the PNC composite coatings displayed better homogeneity of hardness along depth direction than that of the LGN samples. Based on data fitting, an empirical formula was tentatively developed to estimate the hardness of PNC coatings.

1. Key Laboratory of E & M(Zhejiang University of Technology),Ministry of Education &Zhejiang Province,Hangzhou 310014,China;

2. College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310014,China

Received Date: 2013-06-05

Rev Recd Date: 2013-07-15

Publish Date: 2014-02-25

Key words:

Abstract: Composite coatings with micro/nano scale TiN reinforcing phases were successfully fabricated by pre-nitriding+pulse laser cladding treatments on TC4 substrate surface. A comparative research on microstructures and mechanical properties were carried out between the pre-nitriding+cladding(PNC) composite coatings and the conventional laser gas nitriding(LGN) samples. The results showed that the PNC composite coatings were composed of TiN and ' martensite. With the contents of N in powder mixtures augmenting, the hardness increased gradually. Comparative analysis indicated that, the hardness properties of the PNC composite coatings were equivalent with that of LGN samples. In addition, the PNC composite coatings displayed better homogeneity of hardness along depth direction than that of the LGN samples. Based on data fitting, an empirical formula was tentatively developed to estimate the hardness of PNC coatings.

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Micro/nano-scale TiN reinforcing composite coatings fabricated by pre-nitriding+cladding treatments

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