6K Tsuda, A Ikegaya. Development of functionally graded sintered hard materials[ J ]. Powder Metallurgy, 1996,39 (4) :296--300.
7J ma, G E B tan, Zeming. Fabrication and Charaterization of Ti -TiB2 Functionally Graded Material System[J]. Metallurgical and materals transactions,2002,33A:681---685.
8Y T pei, J TH M DE hosson. Functionally Graded Materials Produced by Laser Cladding[J]. Functionally Graded Materials, 2000,(48) :2617--2624.
9Y T Pei, T C Zuo. Gradient microstructure in laser clad TiC - reinforced Ni - alloy composite coating[J]. Materials Science and Engineering, 1998,241A:259--263.