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Online since: January 2013
Authors: Kyu Hong Hwang, J.K. Lee, W.U. Park, J.M. Zhao, T.S. Kim, C.H. Yu
.%] ZrO2 94.2%, Y2O3 5.3% Al2O3 99.1% Density [g/cm3] 6.1 (tetragonal) 3.98 Middle Grain size [μm] 0.3 0.5 Bending strength [MPa] 800 480 Wickers Hardness [HV] 1200 2400 Elastic modulus [GPa] 210 380 The sintering temperatures were 1500 and 1550 oC for 5, 30, and 60 min in the conventional furnace, and were 1450 and 1500oC for 5, 30, and 60 min in a microwave furnace.
The fractured surface of the specimen was measured and microwave observations of the microstructure of the specimens without pores showed dense tissue (Fig. 4, M2), and the typical microstructure of the specimens by conventional sintering still had a large number of pores (Fig. 4, C2).
Online since: December 2005
Authors: Giuseppe Pezzotti
Several studies have been published of local defects and discontinuities (including grain-boundaries, p-n junctions, precipitates or inclusions), variations in impurity concentration and in the energy band gap with composition in mixed crystals, states in the energy gap and excess carrier diffusion lengths by the voltage dependence of selected luminescence band intensities.
Assessments of the diffusion length of electrons in solids can be given according to the Kanaya-Okayama range-energy relation [7]: (A)(A)(A)(A) (B)(B)(B)(B) (C)(C)(C)(C) R = 9/8 3/56 1076.2 Ν ΑΕ − ρ x (3) where R (in cm) is the broadening range of the irradiated electrons, Ν is the atomic number, Ε (in kV) is the accelerating energy of the primary electrons, Α is the atomic weight, and ρ (in g/cm3) is the material density.
Online since: November 2012
Authors: Xu Guang Yang, Bin Zhou
The glassware during this period is small in number and simple kind, only having casing glass beads shaped like the eyeball of a dragonfly, and small pieces of glass embedded in the sword.
With its unique shape [5] and irregular grains, it fully displays glass irregularity that is naturally formed and colors with great texture, and creates a pleasant artistic atmosphere.
Online since: November 2012
Authors: Rui Min Feng, Hui Fu, Hui Yu
Mudstone compressive strength is 0.12~5.12Mpa, siltstone is 0.64~8.00Mpa, siltstone 41.12MPa, fine-grained sandstone 0.42~1.26Mpa.
The calculation formula of protective layer is, and the “n” is the number of slice layers [4, 5].
Online since: February 2014
Authors: Lenita Herawaty, Eti Rohaeti, Charlena Charlena, Sulistioso Giat Sukaryo
The mechanical properties of HAp are affected by the powder form, pores, grain size, particle size and fabrication methods.
Figure 4 depicted the particle size and size distribution by number of the product.
Online since: October 2013
Authors: Xiao Hui Zhao, Yu Liu
Introduction Surface nanocrystallization treatment provides machinery parts with a surface nanocrystalline layer and a coarse-grained interior.
(1) Where, A0 is the constant term; n is the number of harmonic; an and bn are the amplitudes of harmonic; w is the angular frequency of impact wave.
Online since: October 2011
Authors: Shou Xu Song, Jian Hu, Zhong Wei Wu
Introduction Thermosetting plastics are widely used in all military and civilian industry with advantages of specific strength, light weight and durability; meanwhile, a large number of thermosetting plastic wastes are accumulated.
Chengdu;FA-B series of electronic analytical balance, Shanghai Precision Scientific Instrument Co., Ltd. 1.2 Experimental procedures (1) Cleaning and drying out the waste thermosetting phenol-formaldehyde resins; (2) Cutting the phenol-formaldehyde resins into small pieces with the particle of 0.5 ~ 1cm; (3) Adjusting the machine parameters, pulverizing the small pieces of phenol-formaldehyde resins; (4)Dividing pulverization time into 5min, 10min, 15min, 20min, 25min, 30min, collecting the product after crushing separately, screening them with the vibrating screening machine, measuring the percent of mass of every grain particle, and recording the data. 1.3 Experimental data Table 1 Crushed product size distribution Oversize Pulverization Productivity time Particle /μm 5min 10min 15min 20min 25min 30min >250 180-250 120-180 96-120 75-96 <75 40.44 13.2 8.53 10.94 4.51 22.37 33.86 11.81 8.01 9.32 3.28 33.73 27.43 10.1 7.72 8.79
Online since: September 2014
Authors: Ting Jun Ma, Xiu Shi Yang, Pei You Qin, San Cai Liu, Gui Xing Ren, Na Xi A Yi
Buckwheat is known as the king of grains not only for it full of nutritious and has the main bioactive ingredients of flavonoids, proteins and polysaccharides,but has the effects of antioxidant, lowering blood sugar , blood pressure and blood fat and etc [2].
Tab2 Intuitive analysis table of acetic acid conversion rate on Acetic acid fermentation The number Initial alcohol/%vol fermentation temperature /℃ quantity /% fermentation time/h Conversion rate/% 1 1 1 1 1 91.8 2 1 2 2 2 95.3 3 1 3 3 3 89.5 4 2 1 3 2 94.1 5 2 2 1 3 94.7 6 2 3 2 1 94.3 7 3 1 2 3 92.5 8 3 2 3 1 91.2 9 3 3 1 2 90.6 K1 276.6 278.4 277.1 277.3 834 K2 283.1 281.2 282.1 280 77284 K3 274.3 274.4 274.8 276.7 K1 92.2 92.8 92.37 92.43 K2 94.37 93.73 94.03 93.33 K3 R 91.43 2.94 91.47 2.26 91.6 2.43 92.23 1.1 Tab.3 Results of variance analysis Sources of variation SS Df MS F F(0.05) The initial alcohol 13.88667 2 6.94333 6.7411 19 temperature 7.78667 2 3.89333 3.7799 19 quantity 9.287 2 4.64333 4.50809 19 error 2.06 2 1.03 The total variation 33.02 8 This experiment optimized the process of submerged fermentation of acetic acid fermentation,and its main consideration were fermentation time, fermentation temperature, amount of acetic acid bacteria inoculation
Online since: January 2012
Authors: Guo Giang Guo, Ming Chen, Qing Long An, Zhi Qiang Liu
A number of key factors contribute to these results including: 15% higher strength of TC11 over TC4, the much higher ductility of TC11, especially TC11 has superior heat intensity properties when below 500℃ [3].
It was found in Fig. 4(b) that a thick disturbed or plastically deformed layer was formed underneath the ground surface, the grains had been elongated along grinding direction.
Online since: February 2012
Authors: Yi Tao Yang, Zhi Ying Ma
Table 1 The serial number and chemical composition of little scale casting steel samples(wt%) Serial C Si Mn Mo Ni Nb 1 0.104 0.434 1.34 0.299 0.205 0.018 2 0.085 0.408 1.32 0.294 0.39 0.018 3 0.093 0.442 1.41 0.299 0.59 0.020 4 0.102 0.442 1.41 0.493 0.192 0.019 5 0.105 0.432 1.41 0.491 0.387 0.018 6 0.106 0.460 1.85 0.596 0.730 0.025 7 0.110 0.482 1.54 0.734 0.194 0.023 8 0.093 0.450 1.38 0.696 0.463 0.017 9 0.121 0.482 1.53 0.719 0.547 0.020 Table 2 Heat treatments condition Heat treatment Homogenization annealing normalizing Condition(℃, h) 1000℃,1.5h/ Furnace cooling 920℃,1h/ Air cooling Experimental method.
From the EDS analysis results shown in Fig. 7, the elements distributed uniformly, despite of the alloy elements enriched in the grain boundaries of ferrite. 50μ 50μ 50μ No.1 No.5 No.9 Fig.6 The optical microstructure of samples No.1 No.5 No.9 Fig.7 The SEM microstructure and EDS analysis of samples Conclusions The aforementioned results and discussions leaded to the following findings: (1) Tensile strength and hardness of the casting steel improved, elongation dropped with the increasing Mo content.
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