Separate Determination of σ,M_(23)C_6 and other Phases in Nickel-Base Super Alloy(K_(23))——Group Separation by Chemical Method and Quantitative X-ray Diffraction Without Standard Samples

Chemical analysis method is used to determine the concentrations of Al and Cu of the testing standard samples while the concentration of base element Zn is calculated by the normalization method. The concentration range of Al, Cu and Zn are 24.720 ~ 31.113% , 1.340 ~ 5.710%, and 67.070 ~ 69.570% respectively.

The technological conditions on which to prepare the standard samples, sach as ATB, ATB+W_(20)O_(58), WO_2+α-W and WO_2+β-W+α-W, are presented in this paper.

In this paper there are three kinds of standardless quantitative analysis results obtained from the commercial EDAX 9100. TN5500 and KEVEX8000 EDS at 5-30kV. The Cu-Au alloy of NES. GaAs. GaP and InP are used as standard samples.

The results of hydrogen determination in seven hydrogen standard samples (steel, titanium, tantalum powder, niobium powder and stainless steel, etc) by this instrument were in good agreement with the certificated values.

With the help of mathematical statistical method, the artical has proved that it is reliadle to make the technological samples dy infor -mal statidand means when the CO2 sodium silicate sand technologocal samples made dy informal standard samples mae are adout the same weigh t.

According to the method of x-ray quantitative phase analysis without standard samples and the principle of phase equilibrium, this investi-gation presented a simplification method determining alloy phase boundary:in the ternary system, a three-phase region would be determined so long as you prepared three samples in this region. Using this method, we determined the phase boundary of the three-phase region Co+AlCo+Co_3Sn_2 in the Al-Co-Sn system.

A working curve is established by means of fitting the relation between the contents of Ni, Mn, Co and intensities of characteristic X ray from standard samples.

After analyzing with the national standard samples, the results show that the relative deviation is less than 1.3%, recovery ratio is between 99.6% and 99.8%.

Taking the speckle images formed by flat-ground standard samples with Ra (the average value of surface roughness) as 0.1micron, 0.2micron, 0.4micron and 0.8micron, respectively, for examples, the correlation function is obtained according to the calculation for discretization definition of its intensity variations.

A method is developed for the separate determination of aluminum and beryllium using cellulose as the support; the method was used for the analysis of real samples and tested with standard samples.

IUPAC Recommendations for Reference Standard Samples in pH Measurements

Designing of Standard Samples for Determining the Sensitivity of Eddy-Current Devices to the Metal Inclusion Content in a Parama

The reasons of the wide propagation and the high effectiveness of using standard samples of magnetically soft materials are explained.

A numerical analysis of these errors is performed using standard samples as examples.

A spectro-chemical method, for the analysis of trace of impurity elements (Pb, Bi, Sn, Sb, As) in one kind of Ni-alloys, was developed, with D.C. arc powder excitation following H_2S pre-separation.Owing to the needs of long periods of operation and large amount of reagents, the use of A. R. grade reagents led to a considerable blank value. After using purified reagents, the blanks (for Pb, Sn) were reduced to a μ-gram range.During the arcing of the specimens, the evaporation of arsenic was found to be very...

A spectro-chemical method, for the analysis of trace of impurity elements (Pb, Bi, Sn, Sb, As) in one kind of Ni-alloys, was developed, with D.C. arc powder excitation following H_2S pre-separation.Owing to the needs of long periods of operation and large amount of reagents, the use of A. R. grade reagents led to a considerable blank value. After using purified reagents, the blanks (for Pb, Sn) were reduced to a μ-gram range.During the arcing of the specimens, the evaporation of arsenic was found to be very imcomplete. The addition of P_2O_5 accelerated its evaporation very obviously. While the sample being utilized efficiently, the sensitivity of arsenic increased 4—5 times. It was noticed that at the position of the line As 2349 (?), the band spectra of carbon ignited in air was very obvious and a correction must be made.Results of experiments showed that standard samples could be prepared by the H_2S treatment of pure standard solutions. The usual blank correction of the matrix could thus be avoided.An analytical procedure was suggested and the results of three specimens were listed. These data showed teat the lower limits of analysis of this method were: Pb:0.0001%, Sn, Sb:0.0002%, As:0.0003% and Bi:0.00002%.

According to Alexander's relation between diffraction intensity and weight fraction, two new calculation equations of x-raw quantitative phase analysis are obtained. According to these equations, two new methods of quntitative phase analysis are established, that is the method with reference sample and the method without standard sample.One of them can be used in the phase analysis without determined phases which are used as standard sample. Therefore,the problem to obtain pure phase is solved. The other can...

According to Alexander's relation between diffraction intensity and weight fraction, two new calculation equations of x-raw quantitative phase analysis are obtained. According to these equations, two new methods of quntitative phase analysis are established, that is the method with reference sample and the method without standard sample.One of them can be used in the phase analysis without determined phases which are used as standard sample. Therefore,the problem to obtain pure phase is solved. The other can be used in the phase analysis sample, in such a case internal standard samples are not necessary. The experimental operations, therefore, can be simplified and the determination accuracy can be improved.

Brown oxides which consist of three phases including α-W, β-W and WO2 have been produced by the first stage reduction of blue oxides or of WO3 doped Si, Al and K. By using the two phase standard sample and with the help of oxygen content in brown oxides, the quantities of the three phases in various brown oxides can be determined.For the reduction of blue oxide as raw material, the brown oxide has the highest content of β-W when the process factors are 630℃, 65 minutes per boat and the charge with the...

Brown oxides which consist of three phases including α-W, β-W and WO2 have been produced by the first stage reduction of blue oxides or of WO3 doped Si, Al and K. By using the two phase standard sample and with the help of oxygen content in brown oxides, the quantities of the three phases in various brown oxides can be determined.For the reduction of blue oxide as raw material, the brown oxide has the highest content of β-W when the process factors are 630℃, 65 minutes per boat and the charge with the thickness of 6mm thick. Water vapour in hydrogen hinders the formation of β-W seriously; while the additives Si, Al and K promote its formation evidently. The β-W forms easier for the reduction of blue oxide than WO3.In ambient temperature atmosphere, the β-W in brown oxide is more stable. Under given conditions the doping effect of additives rises with the increase of β-W content in brown oxide.