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1、LOGO 19th XXXXXXXConference December 26, 2016 Shenyang, China Sponsor ：Northeastern University Organizer：School of materials science and Engineering Surface Science and Engineering for Industry in Future 8 : 30 8 : 50 registration 8 : 50 9 : 10 Opening ceremonyWelcome speech Pro. M L 9 : 10 11 :10Ke
2、ynote speeches A Nitriding iron at lower temperatures Pro. P L 11 : 10 14 : 10 Lunch 14 : 10 16 : 10 Keynote speeches B Porous mullite ceramics with low thermal conductivity prepared by foaming and starch consolidation Pro. Y D 16 : 10 16 : 30 Closing ceremony Closing remarks Pro. X C 19th XXXXXXXCo
3、nference Opening ceremony December 26, 2016 Shenyang, China Sponsor ：Northeastern University Organizer：School of materials science and Engineering Keynote speeches A XXXXXXXXXXXXXXX Dr. P L Contents Introduction1 Experiment2 Results and discussion3 3 Conclusions4 4 Group 3 Chemical treatment Hard su
4、rface and tough interior Mechanical performance and wear/corrosion resistance Nitriding processes 500 for long duration (2080 hours) NitridingNitriding iron iron Introduction Group 3 Experiment Group 3 Two iron plates (7*100*100mm)with a purity of 99.95 weight percent(wt%) One was treated by SMAT, a
5、nother one not. Both the untreated and treated samples were nitrided in flowing, high-purity ammonia gas(NH3) at 300 for 9 hours Results and discussion Group 3 Fig. 1.cross-sectional observations of (A)an original coarse grained Fe sample (B)a SMAT Fe sample after nitriding at 300 for 9 hours (c)Nit
6、rogen concentration (D)microhardness along the depth from the top surface layer in the original Fe sample Results and discussion Group 3 Fig.2.(A)a dark-field TEM image (B)the corresponding electron diffraction pattern for the compound layer (C)A TEM image for the microstructure beneath the compound
7、 layer (D)An XRD for the SMAT Fe sample and the original sample ConclusionsGroup 3 Similarly, other surface chemical treatments that are controlled by the diffusion of foreign atoms and are used in industry to improve the performance of engineering materials can be also be enhanced by SMAT. We found
8、 a greatly enhanced diffusively of chromium in the SMAT Fe at 350 ,which is about 300 to 400 lower than the conventional treatment temperature This enhance processing method demonstrates the technological significance of nanomaterials in improving traditional processing techniques and provides a new
9、 approach for selective surface reactions in solids. Company Logo Keynote speeches B XXXXXXXXXXXXX Dr. Y D Contents Introduction Experimental Results and discussion Introduction Porous ceramicsPorous ceramics low bulk density、low thermal conductivity（less than 0.2W/mK） 、heat resistance、high porosity
10、 and high surface area leaching method、gelcasting、 reaction-bonding technique、starch consolidation method、gel freeze drying and foam-gelcasting Property molding method Experimental Materials Preparation processing lAn industrial grade fused mullite powder lCristobalite（SiO2） lSodium carboxymethyl ce
11、llulose （ CMC) lSodium dodecyl sulfate(SDS) Mullite powder, cornstarch, CMC, distilled water and dispersant Sintering Ball milling 20 min Foaming suspension Consolidation (75 for 1h) Foaming of suspensions Results and discussion Micro- structure Porosity Foaming of suspensions Higher solid loading r
12、esults in larger viscosity and lower foaming volume Viscosity of the foamed suspension is much higher than the original one at low rotational speed. Porosity When the temperature increased ，the porosity decreased At the same sintering temperature low solid loading sample has a higher porosity. Micro
13、structure The two samples exhibit almost a same pore morphology which is a typical result of direct foaming method . It can also be found that higher porosity sample contains more large pores than lower one. The result indicates that the porous mullite ceramics prepared by this method exhibit a simi
14、lar pore morphology and contain more large pores with higher porosity. 62.5wt%67.5wt% Conclusions The porosity of porous mullite ceramics can be varied from 73 to 86 vol% by adjusting solid loading of suspension and sintering temperature. Porous mullite ceramics comprised a hierarchical microstructu
15、re of large spherical pores and small pores on internal walls, and possessed a larger average pore size with higher porosity. These samples prepared by foaming and starch consolidation have low thermal conductivity and meanwhile keep suitable mechanical strength. 19th XXXXXXXConference Closing ceremony December 26, 2016 Shenyang, China Sponsor ：Northeastern University Organizer：School of materials science and Engineering Company Logo Group 3 Chair A K Welcome speech L M L P Keynote speaker D Y Closing remarks C X R N Questioner Z Z (Team leader) (secretary) LOGO 知识回顾知识回顾 Knowledge Know
