Search results

Furthermore, high decomposition temperature of sulfate inhibits grain growth resulting in small particle size and less agglomeration [17,18].
YAG powders agglomeration can be attributed to too fast grain growth, which is detrimental to the densification of YAG ceramic [24].
For YAG-1.5 there are a large number of fine particles around the coarse particles.

Initial time 196 [min] Setting time 267 [min] Specific surface 377 [m2/kg] Average grain size 20 [µm] Density 3110 [kg/m3] Bulk density 980 [kg/m3] Table 2.
Density 2120 [kg/m3] Specific surface 225 [m2/kg] Average grain size 87 [µm] Before adding to concrete mix, nanosilica had to be treated in the ultrasonic bath Bandelin Sonorex Super RK 106.
Similar results were shown by a number of authors, e.g.

The specimens were etched to show the grain boundaries in the microstructure using the (NH4OH+H2O2+H2O) etchant [16].
Nearly equiaxed grain morphologies are generated, and Be addition modifies the Cu-Zn-Al alloys' structural characteristics. 4.
[18] J L Olajide F J Zannu, O O Daramola, A S Ogunbadejo, E A Okotete, E R Sadiku and K K Alaneme, Morphological characterization, in vitro biomedical corrosion and corrosion behaviour of As-Cast Cu-Zn-Al-FeMn alloys in selected intravenous and industrial fluids, Materials Research Express, Volume 6, Number 9, 2019.

The latter method allows to obtain nanocrystalline/amorphous, amorphous or polycrystalline materials and to control the grain size of the obtained Ni-Mo coatings from several to hundreds of nanometers.
It should be stressed that independently on the type of the plating bath used, with the increase in the Mo content in electrolyte, the grain size of the electrodeposited Ni-Mo coatings decreases.
Number of these micro-spheres is dependent on the electrochemical conditions of deposition.

In addition, the brittleness and high hardness can also cause strength degradation due to the formation of surface and subsurface cracks and other defects [16-18].Flawless machining, free of brittle fracture was possible by having a critical depth of cut and flattened grains slightly protruding from the surface of the grinding wheel [19].
It was observed [20] that the material removal rate increases and the quality of the ground surface decreases with increasing number of cracks in grinding and cutting of advanced ceramics with diamond grinding wheels containing a binding resin bond.
In ceramics, plastic deformation does not occur during material removal, both the strength and brittleness reduce at high temperatures due to the softening of a glassy phase at the grain boundaries; the material is removed mainly due to the combination of brittle fracture and plastic deformation [39].Although LAM is a comparatively low cost process with improved efficiency, the surface quality of machined by LAM parts leaves something to be desired: when the cutting tool enters and exits the work piece during the laser assisted milling of ceramics (Si3N4), it results in work piece edge chipping at both the entry and exit location [40].An increase in work piece temperature at the cutting zone during LAM of Si3N4 can eliminate both the macro-scale entry and interior edge chippings, but the macro-scale exit edge chipping cannot be avoided completely.

In the general format, austenite transforms into other phases following: dXdt=FT, G, C×SX SX=X0.41-X1-X0.4X (1) where X represents ferrite, pearlite, or bainite phase fractions, F is a function of current temperature at an IP, G, the Prior Austenite Grain Size (PAGS), and C, the steel composition.
(a) Finite element input model showing the temperature distribution (˚{TTP}730 C) for the high speed autogenous weld with the centre of the torch being at the middle; (b) finite element calculation of bainite distribution in the middle of the beam for the slow speed traverse; (c) effect of prior Austenite grain size on the phase transformation from austenite into bainite: finite element results for cooling rate of 3 ˚{TTP}730 C/sec 4.
Comparison between results for ASTM PAGS number 0 and 3 in Fig. 1c shows that the change in the PAGS can change the nature of the transformation sigmoidal function.

Introduction Rice husk (RH) is the outermost layer of a paddy grain which can be separated from rice grain by milling process.
The functional groups of the synthesized and treated silica nanoparticles were analyzed by Fourier transform infrared spectroscopy (FTIR, Spectrum 400 FT-IR/FT-NIR Spectrometer/PerkinElmer) at room temperature over the wave number range from 4000 - 550 cm-1.

The high number of people, who lived in the cities composed of cave-houses, made necessary adjustments to make the places healthy: the underground dwellings, therefore, were equipped with ventilation systems, cisterns, warehouses, wells and small openings not visible to the outdoor but that allowed the exchange air.
In the case of windmills the driving force is the wind: this moves the large blades, made of wood, placed at the top of the structure; a system of gears is connected to these, which move the millstones that grind the grain or operate the mechanisms being used to pump the water.
Over the centuries the system has been applied on several occasions and it is certainly easy to associate the shape of the water mill with the millstones for the grain and, therefore, the production of flour.

The degree of their impact depends on the wood density as well as on the orientation of the wood grain [7].
Altogether sixteen sets of specimens were prepared for the experiment, all of them consisting of seven veneer layers while the grain of veneer in alternate plies was at right angles.
Mechanical properties were determined using a set consisting of an equal number of convex and concave specimens and the properties were determined through statical bend using testing device in accordace with the standard [13].

Besides, using grain crops to produce biodiesel will create a situation of “cars competing with human for food”.
With the rapid development of Chinese economy, the demand for energy will become even bigger, it is estimated that China’s demand for primary energy will be 2.83 billion tons of standard coal equivalent in 2020, which will be twice the number in 2000.
[7] Li Weimin, Yao Jian and Yang Hongli: Making Biodiesel from Hogwash Oil, published on Grain and Food Industry, NO.1, Vol.15, 2008