This paper has researched the pressureless sintering performance of hexagonal boron nitride,with Al_2O_3, Y_2O_3 and B_2O_3 as the additive, under N_2 atmosphere, pressureless sintering at about 1800 °C degrees.
This article researches affection of atmosphere pressure to hydro-kinetic force process by using fluid mechanics theory and works out amendatory method about pump allowable mounting height, wind pressure of centrifugal fan,rotor power and gas rotameter scale and algorithm of air-pressure pipe length of counter-current flow hight-order condenser in different atmosphere. It is significant in different above sea lerel area, eapecially in plateau and basin.
The results show that the samples with thermal conductivity 63. 5W/m· K and dielectric constant 8. 76 are acquired by hot-pressed sintering under nitrogen atmosphere and two hours soaking time.
For B-3 sample, U6+ percentage decreases from 16.5% to 4.1% and 6.2% respectively at air and carbon monoxide atmosphere when the roast temperature is 700℃. It shows that carbon monoxide atmosphere avails to decrease U6+ of sample.
A series of methodologies for the measurements of iodine species in the gas and particle phases of the coastal atmosphere has been developed.
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It has been found that rectificative phenomena exist only in the atmosphere-liquid interface region by means of liquid adsorption, and electric field could help form the oriented molecular film.
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An ionic liquid (IL) was prepared by directly mixing InCl3 and 1-methyl-3-butylimidazolium chloride(BMIC) with molar ratio 1:1 under dry argon atmosphere.
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The decomposition rate of DAAT is sensitive to pressure and in direct proportion to atmosphere pressure.
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The content of water vapor in atmosphere is very little and the ratio of volume of moisture to air is about 0.1%-3%, but water vapor is the most active molecule in atmosphere.
In the present communication a practical method for obtaining a semi-conducting glass with high electrical conductivity was described. The authors have attempted to utilize a mixture of BaO(25%), TiO_2(45%) and SiO_2(30%)as the fundamental composition for this investigation,and to the mixture the flux(Na_2SiF_6), various reducing agents(carbon powder, Al, Zn or Mg powder, tartaric acid) and oxides(Fe_2O_3, SnO_2, Sb_2O_3, V_2O_5) were then added. Each batch being melted separately under different atmosph...
Considering the experimental methods used and results obtained by previous investigators on the preparation of silicon carbide by gaseous cracking, we have performed our experiments in a similar carbon plate resistance furnace in an atmosphere of hydrogen, argon or nitrogen at temperatures from 1400 to 2200℃. The vapor reacting agents used are either SiCl_4,CH_3SiCl-3, (CH_3)_3SiCl or the mixture of toluene and SiCl_4 or (CH_3)_3SiCl。Having examined carefully under polarising microscope, we revealed w...
On the basis of investigation on the(La_(1-x)Sr_x) CrO_3 system, the authors had paid atten-tion mainly to study the structure of La_(0.84) Sr_(0.16) CrO_3. The samples used were synthesizedfrom La_2O_3、SrCO_3 and Cr_2O_3 at 1400℃. It was found that the structures of (La_(1-x)Sr_x)CrO_3belong to the cubic or pseudocubic crystal system. Moreover, the change in structures hasdefinite regularity and depends upon the value of x. The structure of La_(0.84)Sr_(0.16)CrO_3 belongsto the tetragonal system (with a =3...