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With the wide application of difficult machining materials, such as Ni-base superalloy and high Cr cast iron, there is an increasing requirement for high performance tool materials.
Ryan, Phases occurring in the Si3N4-YN system, Journal of Materials Chemistry. 7(1997)505-509. 2 G.Woetting, B.Caspers, E.Gugel, Hightemperature properties of SiC-Si3N4 particle composites.
Journal of Engineering for Gas Turbines and Power, 8(2000)122-124. 3 F.Q.Yan, F.Chen, Q.Shen, Spark plasma sintering of α–Si3N4 ceramics with MgO–Al2O3 as sintering additives, Key Engineering Materials. 176(2007)351-356. 4 G.
Liu, Effect of Mg-Y oxides on the microstructure and properties of Fe–Mo/Si3N4 cermet, Chinese Journal of Materials Research. 24(2010)232-238. 7 J.
Cheong, Processing and properties of Al2O3/ Si3N4 nanocomposite coated alumina by slurry dipcoating, Journal of Materials Science Letters. 17(1998)747-749. 8 X.

Introduction Lightweight and safety of automobile have made new demands on modern science and technology.
K: materials thermal conductivity,W/(mK). p: the density of the material, Kg/m3. cpm: the heat capacity of the material, J/(KgK).LM: the latent heat of fusion for materials, KJ/Kg.Lp: the latent heat of phase change for materials.
KJ/Kg.LV: the latent heat of vaporization for materials.
△f : the defocus. mm. dmin: focusing light spot diameter,mm. t: the role time.s.d: thermal penetration depth for laser in materials r.d=2(at)1/2,m.
Huazhong University of Science & Technology Press(2004 )

Grabchenko, Diamond Grinding of Super-hard Materials, Journal of Materials Processing Technology, 97(1-3), (2000), 120-125
Yoshikawa, Grinding Induced Damage in Ceramics, Journal of Materials Processing Technology, 132(1-3), (2003), 353-364
Bergheau, Residual Stresses Computation in a Grinding Process, Journal of Materials Processing Technology, 147(3), (2004), 277-285
Dahotre, Microgrinding Hypereutectoid Steels Using Laser-modified Corundum Abrasive Materials, International Journal of Machining and Machinability of Materials, 1(1), (2006), 12-26
[20] Medvedeva O.I., Yanyushkin A.S., Popov V.Y., Calculation of the energy of adhesion contact surfaces for instrumental materials by various methods, Science Intensive Technologies in Mechanical Engineering, 35(5), (2014), 14-19 (in Russian)

Experimental Investigations on Capabilities of Resistance Spot Welding and MIG Brazing for Producing Corrugated Beams Using Galvanized Steel Sheets RADU Bogdan1,a*, UNGUREANU Viorel2,3,b, BOTH Ioan2,c, BURCĂ Mircea1,d, BENZAR Stefan2,e, DUBINĂ Dan2,3,f 1University Politehnica Timisoara, Department of Materials Science and Engineering, Timisoara 300222, bd.
This paper summarized the research work carried out by a team from Department of Steel Structures and Structural Mechanics, together with Department of Materials Science and Engineering, from University Politehnica Timisoara, which tried to determine the possibility to use welding for obtaining built-up cold-formed steel beams made of corrugated galvanized steel sheets (grade S350GD+Z).
However, the main advantage of MIG brazing is the low temperature developed in the electric arc, which is lower than the fusing temperature of the base materials (galvanized steel grade S350GD+Z used in our investigations), the filler material, by capillarity fills the gap between the base materials and creates the brazed joint.
There were a very small number of samples the fail by an interfacial fracture between the two materials.
Pimenta, “Influence of shielding gases and process parameters on metal transfer and bead shape in MIG brazed joints of the thin zinc coated steel plates”, Materials & Design, vol. 27 (5), 381-390, 2006 [4] N.

In this study, Cu-H2O nanofluids is considered as the phase change materials to enhance the ice storage performance of flake ice storage system.
The parameters of three different phase change materials are shown in Tab.
The comparison of thickness of ice layer of different phase change materials Conclusions A numerical model is developed to simulate the heat transfer process of water and nanofluids solidified on evaporator plate of flake ice storage system.
Acknowledgments The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (No.50706028 and No.50908039).
Lightstone, “Buoyancy-driven heat transfer enhancement in a two-dimensional enclosure utilizing nanofluids”, International Journal of Heat and Mass Transfer, Vol. 46, Sep. 2003, pp.3639–3653, doi:10.1016/S0017-9310(03)00156-X [6] Khodadadi.J.M and Hosseinizadeh.S.F., “Nanoparticle enhanced phase change materials(NEPCM)with great potential for improved thermal energy storage”, International Communications in Heat and Mass Transfer, Vol. 34, May. 2007, pp. 534-543, doi:10.1016/ j.icheatmasstransfer.2007.02.005 [7] Yang Shuo, Zhu Dongsheng, Wu Shuying, and Li Hua, “Study on Phase-change Cold Storage Characteristics of Al2O3-H2O Nanofluids”, Journal of Refrigeration(in Chinese), Vol.31, Feb, 2010, pp.23-26, doi:10.3969/j.issn. 0253-4339. 2010. 01. 023

Materials and Methods Materials.
Journal of Anhui Agricultural Science.
Northwest Pharmaceutical Journal.
Journal of Farm Machinery Research.
Journal of Anhui Agricultural Science.

High strength material was replaced for super high strength materials steel 406.
In AUTODYN, materials in the software material library were loaded in, which included air, steel, copper, RDX explosives.
It is an ultra-high strength steel, developed to solve large-scale solid rocket motor case materials.
The finally calculated thickness for high-strength materials was 6.75mm less than that for original design.
Luo: Aerospace Materials & Technology, Vol.6(1986), p.11 [10] S.H.

In addition, paper and other flammable explosive materials of garbage may cause explosion under the condition of friction and extrusion.
The unsafe behaviors of the people, unsafe machineries, materials and environment can be eliminated through strengthening the safety management.
Journal of catastrophology, 1997, 12(3)，P89-92
China Safety Science Journal, 2005, 15(10)，P61-65
China Safety Science Journal, 2005, 15(6)，P108-112

Effect of grafting cellulose acetate and methylmethacrylate as compatibilizer onto EPDM/SBR blends［J］．Materials and Design. 2010, 31: 2592–2598
[4] Lin huzong, Phantasmagoric flowing science-multiphase hydromechanics.
Journal of Lanzhou University (Natural Sciences).
Karger-Kocsis: Journal of Applied Polymer Science Vol. 115(3) (2010), p.1651 [8] A.
Saffar: Journal of Materials Science Vol. (2010), p.1 [9] Wen Shizhu, Huang Pin.

[3] Li Min Shi, Yu Quan Chen, Er Liang Liu: Key Engineering Materials Vol. 375 (2008), p. 6
[5] Chen Yuquan:Journal of Materials Processing Techology Vol. 129 (2002), p. 310
[7]Li Min Shi, Er Liang Liu,Yong Jiang Niu, Yu Quan Chen:Advanced Engineering Materials (2010)
[9] Hon-yuen Tam, Osm and Chi- hang Lui, Alberert CK MOK:Journal of Materials Processing Technology Vol.95 (1999), p. 191
[10] SHI Li-min, CHEN Yu-quan, SHI Qi-min:Journal of Harbin University of Science and Technology (2007).in Chinese.