Sol-gel method and no pressure sinter are used in the experiment, some influences are considered in the powder synthesizing progress, Ca_3Co_2O_6 is decomposed by Ca_3Co_4O_9. They have the same tendency of resistivity and Seebeck coefficient with the temperature and are both p-type semiconductors.
The dispersing technology for advanced self-toughening Si_3N_4 matrix nano-scale composite ceramic powders was proposed and the Si_3N_4 matrix nano-scale composite ceramic powders without agglomeration was successfully prepared.
the flat steel back can be substituted for the bowl-shaped steel back to reduce costs on the premiss of assuring the bonding strength between the steel back and the ceramal friction material not lower than the shear strength of the ceramal friction material by selecting rational agglomeration process parameters.
The test results show that the particle size of product obtained is about 10 nm,when the product is roasted at 200~500 ℃ for 2 h,the products can still be as nanosized particle with about 20 nm,and the agglomeration phenomenon between the particles is not found.
Usually the long SMAs fiber reinforced aluminum matrix composite is madeby the method of casting with high pressure, or pressure with high temperature and agglomeration of powder, the internal stresses in the fibers and matrix of composites must be studied under the variation of temperature for the research does influence macroscopic properties of the composites.
Steam produced during the decomposition process accelerated the sintering of MgO, and MgO with surface area as high as 412 m2 · g-1 was obtained through calcining its precursor in flowing dry nitrogen at 520°C for 4 h.
The fabrication procedure involved a double-sintering process in a rich-Mg environment.
Samples with the equally high density and matching superconducting properties were obtained as well by a triple sintering process of the MgB2 powder directly from Alfa Aesar.
The specific surface areas are different before sintering, and have a slight difference after sintering.
Besides, the impurity phase, tetracalcium phosphate, appeared during ultrasonic atomizing procedure, and can be completely removed after sintering at 650°C for 1 h.
Polycrystal Li2B4O7 (LBO) doped with Cu and In was prepared and then sintered at different temperatures.
Mean decay constant of OSL is related to the sintered temperature.
However, for the majority of systems of practical importance - the ensemble of pores when powders are sintered or an ensemble of gas bubbles in a liquid - even the actual possibility of their steady evolution is far from obvious.
A decrease in the thickness of the porous layer sintered on the plate surface is accompanied by an increase in the radii of curvature of the interfaces of this layer.
Green compacts were shaped by cold isostatic pressing under a pressure of 300 MPa, and then they were sintered under no pressure for 2 h at 1500-1650°C in air.
In contrast to the conventional selective laser sintering, the SSLS method makes it possible to sinter polymer microparticles and melt the near-surface layer rather than the microparticle as a whole.
The nanoparticles are highly reactive and sinter at low temperatures (T >amp;lt; 0.35Tm).
Effect of the catalyzing combustion of coke breeze on the energy saving in sinter process
The mechanism of additive ZC-1 for catalyzing combustion of coke breeze in sintering of iron ore fines was studied by using X-ray Diffraction, TGA and GC(Gas Chromatographer), by which energy saving was achieved on sinter pot test.
Burnt lime and serpentine were incorporated into the sinter mix to improve high iron and low silica sintering.
The mechanism of the frothing process in restraining agglomeration is discussed.
The results indicated that the adsorption of PEI on the surface of HSNP would increase the repulsive energy among particles, hence reducing the agglomeration of HSNP and improving the stability of the aqueous suspensions.
Modeling of the City Transport Flows as Applied to the Moscow Agglomeration
A mathematical model of the transport system of a city or an urban agglomeration intended for forecasting the transport and passenger flows was described.
The model was calibrated in practice for the transport network of the Moscow agglomeration which includes the city of Moscow and its suburbs where the major part of the population of the Moscow province is concentrated.