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From the XRD patterns and microstructures of Fe-Al alloy layer, the samples diffused at 900˚C without pores and cracks were selected as erosion test materials.
Generally, the hardness of materials is controlling factor at low injecting angle, the toughness at high injecting angle [5].
Materials Science and Engineering of Powder Metallurgy, Vol. 10(2005), p. 133-137 [3] Q.L.
Transactions of Materials and Heat Treatment, Vol. 33(2012), p. 142-148 [4] X.M.
Journal of Materials Science and Engineering, Vol. 17(1999), p. 92-96

The strongest peak at 27.41° for g-C3N4 is a characteristic interlayer stacking peak of aromatic systems, indexed as the (002) peak for graphitic materials.
N1s peak at 399.2 eV is indicative of C-NB2 groups as demonstrated in graphite-like BCN materials[9].
Demazeau, Materials Science and Engineering R Reports, 58(6), 195 (2008)
Antonietti, Nature Materials, 8(1), 76 (2008)
[21]Hu R Z, Shi Q Z, Thermal Analysis Kinetics, Science Press, Beijing (2001)

The materials of other parts of the column are dense and do not affect normal use.
Acknowledgement The authors are grateful for the support of Natural Science Foundation of Beijing Municipality (8184068).
Wang, Architecture beauty in Heaven Temple and universe outlook of Chinese philosophy, Journal of University of Science and Technology Beijing (Social Sciences Edition). 22 (2007) 157-161
Machado, Testing and modeling of a traditional timber mortise and tenon joint, Materials and Structures, 47 (2014) 213-225
Jiang, et al., Exploration of the decay distribution of wooden structure columns with stress wave and impedance meter technology, Journal of Building Materials. 11 (2008) 457-463

Table 1 Sample Codes Code Alloy processing state Chemical composition[wt%] Modifier[wt%] Al Cu Mg Zn Ti B 11(2/3) ZA303 metamorphic 40℃(80/120℃) 30.4 2.5 0.01 margin 0.04 0.01 21(2/3) ZA303non metamorphic 40℃(80/120℃) 30.3 2.4 0.01 margin 0 0 Materials and methods Materials.
The 1#Zn domestically produced, A0 pure aluminum, the Al-50%Cu and the Al-10%Mg intermediate alloy were chosen as the raw materials.
Materials for Mechanical Engineering 5 (1994),p.17-24 [3] Peiyu Wang, etc.
[4] Lyon.R.Metals and Materials 1 (1985) ,p.55 [5] Quande Chen, ect．Journal of Luoyang Institute of Technology 2 (1987) ,p.33 [6] Quande Chen ,ect．Journal of Luoyang Institute of Technology 1 (1991) ,p.45 [7] Xiaofeng Xu, Feng Ni, Shizhong Wei, ect.
Development and Application of Materials Vol. 15，3(2000),p.10-11

Materials and Methods Sampling Region and Location.
Michopoulos: Journal of Hazardous Materials, Vol. 140(2007),p. 389-398
Kumar: Journal of Hazardous Materials, Vol. 179 (2010),p.1084-1095
Park: Journal of Hazadous Materials, Vol. 184 (2010), p.406-416
Zhang: Journal of Environmental Science.

Materials and Experimental Methods Materials.
References [1] Liu X, Wu S, Liu G, Effect of ultraviolet aging on rheology and chemistry of LDH-modified bitumen, Materials. 8 (2015) 5238-5249
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Experimantal Program Material.
Specific information on the materials is given below.
Availability of Data and Materials The data and materials had been included in the manuscript.
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Journal of hydraulic engineering, 2001(12): 1-6
Journal of hydraulic engineering, 2000, 11:49-54
Journal of Sediment Research, 2003, 2(1): 33-38
Journal of mountain science. 2011, 29(4)：469-473
Journal of Nuclear Agricultural Sciences, 2010, 24(5): 1032-1037.

Stress Calibration Tests Testing Materials Calibration sample material is 6082 aluminum alloy with a wide rang of tensile limit.
Materials Science and Engineering A , 2006 ,437 (1) :46 - 53
Comparative neutron and X-ray residual stress measurements on Al-2219 welded plate[J]..Materials Science and Engineering A,1997(224):157-16
Materials Science and Engineering A,2003(346):159-167
Hutchings Measurement of the residual stress field in MIG-welded Al-2024 andAl-7150 aluminum alloy compact tension specimens Materials Science and Engineering A 437 (2006) 46–53 [12] ZHANG Shilin,REN Songzan.

However the special properties of composite materials result in the drilling difficulty, more and more researchers have put focus on the machining mechanism and quality during drilling composite materials.
From the above works contributing to the drilling of composite materials, the effect of spindle speed, feed rate and drill diameter on the defects at the entrance, exit and wall of the hole has been discussed frequently.
Experimental procedure Experiment equipment and materials.
In drilling of composite materials, the spindle speed n and feed rate per revolution fr are the two most important cutting parameters.
Acknowledgments This work is supported by Important National Science & Technology Specific Projects (No.2009ZX04012-032-01).