3Pompe W, Worch H, Epple M, et ol. Functionally graded materi- als for biomedical applications[J]. Mater Sci Eng A, 2003, 362 (1-2): 40-60.
4Chu C, Zhu J, Yin Z, et al. Structure optimization and properties of hydroxyapatite-Ti symmetrical functionally graded biomate- rial[J]. Mater Sci Eng A, 2001, 316(1-2): 205-205.
5Fujii T, Tohgo K, Araki H, et al. Fabrication and strength evalua- tion of biocompatible ceramic- metal composite materials[J]. Jo- urnal of Solid Mechanica and Materials Engineering, 2010, 4 (11): 1699-1699.
6Watari F, Yokoyama A, Saso F, et al. Fabrication and properties of functionally graded dental implant[J]. Composites Part B: En- gineering, 1997, 28(1-2): 5-11.
7Watari F, Yokoyama A, Omori M, et ol. Biocompatibility of mate- rials and development to functionally graded implant for bio-m- edical application [J]. Composites Science and Technology, 2004, 64(6): 893-908.
8Kondo H, Yokoyama A, Omori M, et al. Fabrication of titanium nitride/apatite functionally graded implants by spark plasma si- nterin[J]. Materials Transactions, 2004, 45(11): 3156-3162.
9Miao X. Observation of microcracks formed in HA/316L compo- sites[J]. Materials Letters, 2003, 57(12): 1848-1848.
10Guo H, Khor KA, Boey YC, et al. Laminated and functionally gr- aded hydroxyapatite/yttria stabilized tetragonal zirconia compo- sites fabricated by spark plasma sintering [J]. Biomaterials, 2003, 24(4): 667-675.