Aluminum hydroxide colloid was prepared by double hydrolysis method and carbon dioxide injection method with co mmon industrial sludge as the raw material respectively,and then they were calcined at 1100 ℃ to obtain α-Al2O3 powder.

Morphologies,compositions and structures of the sludge, Al(OH)3 colloid and α-Al2O3 powder were characterized by field scanning electron microscopy(FESEM),energy dispersive spectra(EDS) and X-ray powder diffraction(XRD).

The results showed that the relationship between pressing pressures and pressed densities of Mo powders under isostatic cool pressing accords fully with huang's formation theory.

Preparation of dispersive and fine α-Al2O3 platelets was attempted by solid-state reaction at high temperature using commercial gibbsite powders as the primary raw material and with addition of seeds and mineralizer.

The results show that the higher ball milling energy may be obtained when the ball-to-powder mass ratio is 20∶1,and rotation speed is 500 r/min. The solid-state reaction between Y2O3 and Al2O can be activated to compose YAlO3(YAP),with mechanical alloy in 10 hours.

X-ray powder diffraction results show that the as-grown SrWO4 single crystal belongs to tetragonal system and I41/a space group.

The structures of the CdSe quantum dots were determined by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM).

Tungsten trioxide powder has been prepared from ammonium paratungstate via hydrothermal method using orthogonal and mono-level design of experiments.

The blank reference experiment shows that hydrothermal crystallization treatment favors the formation of hexagonal tungsten trioxide, and the tungsten trioxide powder sample prepared by this method has a high degree of crystallinity.

According to the Ullman reaction mechanism, the synthesis of 1,5-di(o-anisidino)anthraquinone was achieved by the multiphase reaction of 1,5-dichloroanthraquinone in xylene and o-anisidine in the presence of copper metal powder and potassium acetate.

Chemical and physical reactions during the low temperature aqueous chemical synthesis of nanostructured Bi2Te3 powders were investigated in-situ by pH measurement, color observation of the solution and X-ray diffraction analysis of the powders.

Preparation and characterization of ZrWMoO8 powders with different morphologies

ZrWMoO8 powders with different morphologies were obtained using ammonium tungstate, molybdate tungstate and zirconium tungstate as the starting materials by dehydrating the precursor ZrWMoO7(OH)2(H2O)2.

TEM photographs of synthesized powders from the sol-gel auto-combustion showed that the crystallites were uniform in size.

The magnesium powders used in the fabrication process include nanometer-sized magnesium particles, powders from Alfa Aesar, ordinary off-the-shelf powder, and magnesium chip.

Nanocrystalline Ag/MgO composites were prepared by the ultrafine-powder-compaction method.

The total work of compaction of powders, from zero strain(ε= 0) to in-finite strain (ε= ∞), is derived in this paper to be: a_(total)= Mw (1/d_0-1/d_m) Γ(m + 1)where M is the modulus of compaction of powder, w is the weight of powder,d_0 is the initial density of powder, d_m is the theoretical density of densemetal, m is the index of non-linearity and Γ(m + 1) is the gamma functionof (m + 1). Γ(m + 1) = ∫_0~∞ e~(-8)ε~mdεwhere ε is the strain of compaction, ε=ln((d_m-d_0)d)/((d_m-d)d_0)and d is the green density...

The total work of compaction of powders, from zero strain(ε= 0) to in-finite strain (ε= ∞), is derived in this paper to be: a_(total)= Mw (1/d_0-1/d_m) Γ(m + 1)where M is the modulus of compaction of powder, w is the weight of powder,d_0 is the initial density of powder, d_m is the theoretical density of densemetal, m is the index of non-linearity and Γ(m + 1) is the gamma functionof (m + 1). Γ(m + 1) = ∫_0~∞ e~(-8)ε~mdεwhere ε is the strain of compaction, ε=ln((d_m-d_0)d)/((d_m-d)d_0)and d is the green density of powder compact.The actual work of compaction of powders from ε_1 to ε_2 is derived to be: a = Mw (1/d_0-1/d_m)∫ε_1ε~2 e~(-ε)ε~mdεwhere ∫_(ε_1)~(ε_2)e~(-ε)ε~mdεis the incomplete gamma function of (m + 1), the numer-ical value of which can be evaluated by computers. Examples of calculations for the work of compaction on tungsten powderare given and tabulated.

In this paper the extended applications of Huang Peiyun's double logarithmic equation of Powder Compacting are emphatically introduced on the basis of isostatically pressing practice. It is recognized that the equation can be turned into non—logarithmic form by mathematic treatment. Experimental data of 11 kinds of powder isostatically pressed show that the above equation has high accuracy and is practical. Tne equation has been analyzed and is indicalive of a mathematic expression of pressure—green density...

In this paper the extended applications of Huang Peiyun's double logarithmic equation of Powder Compacting are emphatically introduced on the basis of isostatically pressing practice. It is recognized that the equation can be turned into non—logarithmic form by mathematic treatment. Experimental data of 11 kinds of powder isostatically pressed show that the above equation has high accuracy and is practical. Tne equation has been analyzed and is indicalive of a mathematic expression of pressure—green density curve for powder compacting. The slop of this curve is as follows:

The concentration distribution of pulverized coal in blowpipe of blast furnace was measured in an isothermal two-phase model by means of a computer measuring system based on infrared transmission. The results show that concentration near the exit of oxygen-coal lance is distributed unsymetrically and that the concentration along the direction of the gas-solid jet is much higher. The concentration distributions in the distance about 2.5 times diameter of blowpipe from the exit of the lance tend to be uniform...

The concentration distribution of pulverized coal in blowpipe of blast furnace was measured in an isothermal two-phase model by means of a computer measuring system based on infrared transmission. The results show that concentration near the exit of oxygen-coal lance is distributed unsymetrically and that the concentration along the direction of the gas-solid jet is much higher. The concentration distributions in the distance about 2.5 times diameter of blowpipe from the exit of the lance tend to be uniform due to the mixing of gas and solid phase rapidly in blowpipe.