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Online since: August 2011
Authors: Chun Jiang Zhu, Hong Qiang Ru, Chen Zhang
A large number of inorganic filler not only will lead to the decrease of mechanical properties but also significantly increase the viscosity of polymers, resulting in the deterioration of processing performance and products[1-2].
When the concentration of tetra-isopropyl titanate is lower than 1%, the FT-IR dates show that the grain can not cover the surface of inorganic particles fully, but the amount of tetra-isopropyl titanate grafted onto the surface of inorganic particles increases by increasing its concentration.
On the contrary, the surface of GGBFS links with a large number of tetra-isopropyl titanate molecules after activation by the latter.
Online since: October 2012
Authors: Régis Bigot, Eric Becker, Laurent Langlois
Part geometry and mechanical quality The whole point of thixoforging is to make complex-shaped parts while reducing the number of forming steps (sometimes down to one single step) to obtain a Near-Netshape part [10-12].
It is certainly superior to that of parts obtained by molding because of the grain flow and refinement, while allowing just as complex shapes.
The industrial setup installed to thixoforge the C38 part (figure 4) has shown it is possible to produce a large number of parts with die speeds and wear compatible with economic and industrial constraints.
Online since: June 2010
Authors: Yong Xiang Zhao, Wen Dong Shao
Brittleness and grain interface fracture of high Cr and Cr-Mo cast steels can be controlled by moderate contents of aluminum and nitrogen elements plus sustaining temperature out of 900~1200℃ range[6].
By the code ASTM E813-89, an effective measurement must meet the requirements of fracture surface crack morphology, i.e. numbered nine lines representing the crack lengths ai (i=1, 2, …, 9) should be measured with a same interval distance along the crack tip.
The fracture roughness, KIC,P-C, at arbitrary P-C levels can be evaluated using formula ( ) ( )[ ]( )rmsIc s1 avIc lg1 lg IC, 10 KntZK CP CP K −+− − − = (3) where lgKIC,av and lgKIC, rms are average value and standard deviation of the test logarithms of fracture roughness KICi data; i=1, 2, …, ns; ns is number of the KIC data.
Online since: July 2011
Authors: Xiu Bing Liang, Lin Lei Wang, Wei Guo, Yong Xiong Chen
Based on the concepts of high hybrid entropies and iso-atomy ratio, high-entropy alloy has structure characteristics of simple microstructure, nano-educt, amorphous structure, nano scale grain, etc[1,2].
Four kinds of cored wires with different composition are prepared by the muti-function cored wires fabrication equipment in Beijing University of Technology, numbered 1#, 2#, 3 #, and 4# respectively.
Table 1 Composition of cored materials number strip powder 1# 18-8 stainless steel Cr+Cu 2# 18-8 stainless steel Cr+Cu+ferroboron 3# Ni80Cr20 Cr+Co 4# Ni80Cr20 Cr+Co+ferroboron Powder U-shaped Strip Pull Fig.1 Schematic of manufacture of cored wires Coating Preparation.
Online since: August 2016
Authors: Martin Boháč, Radoslav Novotný
Results and Discussion Initial hydration of cement is accompanied by a number of complex reactions and microstructural changes due to the formation of hydration products.
As the paste sets it becomes gradually more solid-like with prevailing elastic behavior; thus the value of the phase angle (°) decreases to single-digit numbers.
Scrivener, Microstructural development of early age hydration shells around cement grains, Cem Concr Res 40 (2010) 4–13
Online since: January 2015
Authors: Yu Liu, Yi Bai Wang, Jin Qing Wu, Heng Chang
As a part of controllable solid propulsion (CSP) technology, Aerojet had developed the ability to control multiple variable thrust pintle nozzles integrated on a single gas generator with a solid propellant grain [14].
The frequency and number of the pulses to be received are directly related to the velocity and the final position of the pintle, which determined the valve opening (Fig. 2(c)).
The thrust coefficient (CF) changes a little during the pintle movement, and is regarded as a constant number in this paper
Online since: July 2013
Authors: Liang Hao, Jian Gu, Guang Hua Yin, Wen Hui Li, Zuo Xin Liu
Proper supplementary irrigation could enlarge leaf area of plants, improve leaf blade grain filling rate, and increase crop transpiration and soil evaporation ratio, relieve adverse effects on crop growth and development due to soil moisture deficiency[5].
The average annual temperature is 7.2°C, the average temperature in the crop growth period is 20.2℃, the number of the ≥10℃ accumulated temperature days is l69d, the effective accumulated temperature is 3298.3°C.
The number of frost-free days is 144d, the amount of annual radiation is 579.8 kJ·cm-2, the physiological radiation is 284.3 kJ·cm-2, the annual sunshine hours are 2865.5h and the growth period sunshine hours are 1 295.8 h.
Online since: March 2004
Authors: Xi Peng Xu, Jian Yun Shen, Juan Liu, S.Y. Zheng
From the principle of hard and brittle materials grinding, the increase of spindle speed means that the decrease of depth of cut taken by a cutting grain, and thus more ductile flow and less brittle fracture in the grinding process.
According to the principle of tribology, the increase of normal force Diamond wheel Air pressure n Workpiece Mica Foil thermocouple Clamping fixture Dewe-3010 Digital Power Meter Workpiece Diamond wheel Air pressure n Nozzle Water Diamond wheel Air pressure n Nozzle Water Workpiece Diamond wheel Air pressure n Lubricant oil Workpiece Journal Title and Volume Number (to be inserted by the publisher) 385 should lead to serious friction in the contact zone.
� � � � Fig.6 Thermal model for theoretical analysis r1 r2 r0 dx’ x’ A B 0 z � = � � q(x’)dx’ z x r1 2q workpiece wheel heat flux r2 n workpiece Journal Title and Volume Number (to be inserted by the publisher) 387 Theoretical Analysis of the Grinding Temperature and Energy Partition.
Online since: October 2012
Authors: Gang Chen Sun, Quan Zhong Lu, Hai Tao Dai, Xin Sheng Li, Xiao Han Sun, Jian Bing Peng
The postion of sensors Double diaphragm pressure cell Pore pressure gauge Serial Number Postion Serial Number Postion 1-2 Bottom of medium fine sand 4 2-8 Bottom of medium fine sand 4 2-5 Top of medium fine sand 4 2-9 25cm above the bottom silty clay3 3-3 Top of silty clay 3 2-7 33cm above the bottom silty clay 3 4-2 Top of medium fine sand 2 5-9 43.46cm above the bottom silty clay 1 5-1 Top of silty clay 1 5-5 50.92cm above the bottom silty clay 1 Displacement meter Displacement meter 2-6 Medium fine sand 4 5-2 Silty caly1 3-8 Silty caly 3 4-9 Medium fine sand 2 3.
Initial physical parameter of soil layer Indicator Silty clay Medium-fine sand Specific gravity of solids 2.7024 2.675 Mass density(g/cm3) 1.789 1.360 Water content(%) 41.14 Plastic limit 18.6 Liquid limit 31.16 Plasticity index 11.56 Fig3.Grain size distribution curve of medium-fine sand The Stress and Deformation of Each Soil Layer Fig .4 Soil stress in Clay layer1 and sand layer2 1.
Online since: December 2014
Authors: Xing Rong Wu, Bao Ma, Hui Hong Lü, Liao Sha Li, Xing Mei Shen
Up to now, besides technological routes to recover chromium from the slag by using reducing agents such as Si, C and Al [4,5], a number of researchers have experimented to incorporate Cr (III) into more stable mineral phases as MgCr2O4 spinel [6,7], or to immobilize Cr (VI) in amorphous vitreous phase [8].
Table 1 Batch compositions of slag systems used for experiments Slag number wt % Basicity (CaO/SiO2) CaO SiO2 MgO Al2O3 Fe2O3 Cr2O3 B2O3 S-1 36.4 45.6 5.0 4.5 6.5 2.0 0 0.8 S-2 41.0 41.0 5.0 4.5 6.5 2.0 0 1.0 S-3 40 40 5.0 4.5 6.5 4.0 0 1.0 S-4 50.4 33.6 5.0 4.5 6.5 0 0 1.5 S-5 49.2 32.8 5.0 4.5 6.5 2.0 0 1.5 S-6 48 32 5.0 4.5 6.5 4.0 0 1.5 S-7 54.68 27.34 5.0 4.5 6.5 2.0 0 2.0 S-8 47.7 31.8 5.0 4.5 6.5 4.0 0.5 1.5 A melt-quenching experiment was performed by putting 50 g of mixed powders based on each slag system (see Table 1) into a platinum crucible which was placed in an alumina protecting crucible and loaded inside a vertical furnace equipped with MoSi2 as a heating element.
Moreover, the region between fine strip grains of merwinite is a matrix phase consisting mainly of Si, Cr, Ca, Fe, Al, Mg, and O.
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