The effects of three kinds of additives,such as Nb_2O_5,Cr_2O_3and Gd_2O_3,on the sintering kinetics are investigated and thegrain growth kinetics of UO_2 fuel pellets are given.
Sintering kinetics, crystallization phases and crystallization kinetics of bioglass in the system of CaO- SiO_2-P_2O_5 were studied by measuring the sintering shrinkage of glass powder compacts, combined with DTA and X-ray diffraction analysis.
Sintering Kinetics of Plasma-Sprayed Zirconia TBCs
First, the phosphorus could prevent the sintering system from oxidation by forming CuPO3, thereby improving the wetting characteristics and the sintering kinetics.
Sintering kinetics and the extent of natural porosity determine the product shell pore diffusivity.
Sintering kinetics and alumina yield in lime-soda sinter process for alumina from coal wastes
Modification of the sintering kinetics of palladium by a surface oxide
For the investigation of sintering kinetics, the surface area of sintered compacts is conventionally measured. The present paper outlines that the surface area of sintered porous metal for valve can be measured by anodic oxidation. Comparison was made between various calculating methods. It is concluded that better results can be obtained by oxygen equivalent method。
Hot-pressing is usually used to sinter up to the theoretical density for mostof the covalent materials such as SiC,Si_3N_4,AlN,Sialon….Lower temperature andshorter time allow to control the development of the microstructure,mainly thegrain size.Another useful possibility is to use the hot-pressing operation as a dilatome-ter and the pressure as a subsequent parameter.Then for a choosen material onecan check isobar sintering curves(density versus time at constant pressure and dif-ferent temperatures) or isotherm...
Hot-pressing is usually used to sinter up to the theoretical density for mostof the covalent materials such as SiC,Si_3N_4,AlN,Sialon….Lower temperature andshorter time allow to control the development of the microstructure,mainly thegrain size.Another useful possibility is to use the hot-pressing operation as a dilatome-ter and the pressure as a subsequent parameter.Then for a choosen material onecan check isobar sintering curves(density versus time at constant pressure and dif-ferent temperatures) or isotherm sintering curves (density versus time at constanttemperature and different pressures).During the last twenty years sintering kinetics laws with pressure have beenderived from power laws for the creep of dense materials.Using the isotherm cur-ves (at a constant relative density) one can deduce the dependence of the sinteringrate versus pressure,and then from the theoretical formular to infer what is thesintering step:diffusion,interface reaction,plastic deformations….When differentelementary steps contribute to the overall process,considerations on the diagram ofthe sintering rate versus pressure are sufficient to know exactly how these stepsact:simultaneously or sequentially.Other informations drawn from the influenceof temperature and grain size for different pressures are also useful.These analyses are not geometrical dependent because they are based on kine-tical studies.In this way they are more reliable than those based on integral formssuch as the study of relative shrinkage versus time.
The effects of three kinds of additives,such as Nb_2O_5,Cr_2O_3and Gd_2O_3,on the sintering kinetics are investigated and thegrain growth kinetics of UO_2 fuel pellets are given.The grainboundary migration activation energies of three doped pelletsare 1.88×10~5,2.91×10~5 and 2.59×10~5 J/mol respectivity.
sintering kinetics
烧结动力学
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