JOURNAL OF THE CHINESE CERAMIC SOCIETY TOTAL CONTENTS Vo1.30,No.1～6,2002

SubjectCeramicAuthor [No.](Page)Effect of Annealing Temperature and Doping on Characteristics of Pseudocapacitors Utilizing Nickel Oxide Electrode ………………………………………………………LiangKui,ChenAi,Wu Mengqiang,^kLi,Zhou WangSiC Whisker Synthesized by Sol—Gel and Carbothermal Reduction Reaction …………………………………………………讹n Long,Liu Yuanfeng,Lu Zhian,Li眈撕,Tang ShaoqiuInvestigation on the Mechanism of Self-Propagating High—Temperature Synthesis Ni——Zn …     

JOURNAL OF THE CHINESE CERAMIC SOCIETY TOTAL CONTENTS Vol.2 9,No .1～ 6 ,2 0 0 1

ＳｕｂｊｅｃｔＡｕｔｈｏｒ　　　　 [Ｎｏ .](Ｐａｇｅ)ＣｅｒａｍｉｃＳｔｕｄｉｅｓｏｎＰｈａｓｅＴｒａｎｓｆｏｒｍａｔｉｏｎｉｎｔｈｅ 3Ｙ -ＴＺＰ/Ａｌ2 Ｏ3 ＣｏｍｐｏｓｉｔｅＰｏｗｄｅｒｓＹｉｎＢａｎｇｙａｏ ,ＷａｎｇＬｉｎｇｓｅｎ [1](1)…………………………………………………………………………………………Ｒｅｓｉｓｔａｎｃｅ -ＣｕｒｖｅＢｅｈａｖｉｏｒｆｏｒＳｉ3 Ｎ4 -ＴｉＮ/ＢＮＬａｍｉｎａｔｅｄＣｏｍｐｏｓｉｔｅｓａｎｄＴｈｅｉｒＴｏｕｇｈｎｅｓｓＭｅｃｈａｎｉｓｍＣｏｎｓｉｄｅｒａｔｉｏｎ…     

BENEFITS OF A COÖRDINATED PROGRAM OF CERAMIC INVESTIGATIONS BY FEDERAL,STATE, AND UNIVERSITY AGENCIES1

The rapid development of ceramic technology is necessary to the well-being of our industry. A comprehensive plan should be laid out and the required machinery, responsible to the manufacturers, set up to accomplish this.     

USE OF BROMATE IN VOLUMETRIC ANALYSIS: IX,DETERMINATION OF ARSENIC AND ANTIMONY BY THE GYÖRY METHOD*

The determination of arsenic and of antimony by the oxidation of the hydrochloric acid solutions of their tervalent forms using standard bromate as oxidant by the Györy method has long been a preferred procedure. This method involves the use of strongly acid, hot solutions and nonreversible internal dye-stuff indicators. Difficulties result from the instability of the indicators under the required conditions. The published improvements as applied to the Györy method are discussed and evaluated. The new study of the old procedure shows that the use of a hot solution is not required. The experimental proof of this conclusion is given, and the use of the “electron beam sectrometer” and a modified “dead stop” equivalence-point determination has been applied to establish the concordance between the potentiometric and visual indicator applications. The performance of the various applicable internal indicators has been described and those preferred are specified.     

THE OXIDATION OF CERAMIC WARES DURING FIRING.—I. SOME REACTIONS OF A WELL KNOWN FIRE CLAY1

After a review of the literature, a chemical laboratory study is made of the gases evolved on heating a lower Kittanning fire clay at various rates to various temperatures in a current of pure oxygen. The rates of evolution of CO₂, SO₂, and SO₃ are determined under varying conditions. Determinations of the remaining sulphur in the clay after heating are made. Possibilities as to the chemical mechanism of sulphur evolution are suggested. Plans for continuation of the work are outlined.     

INFLUENCE OF VARIABLE AMOUNTS OF NEW YORK TALC,FLINT, AND CALCINED CLAY ON SERVICEABILITY OF GLAZÉD COOKING-WARE BODIES*

The effect of composition on the ability of glazed dishes to withstand thermal-shock treatments ordinarily received in cooking was studied. Bodies which gave best results contained approximately 10% of New York talc and also a small amount of calcined clay substituted for potters' flint. Bodies which had sufficiently high thermal expansion to throw the glaze into moderate or strong compression gave the best results. A terra sigillata finish applied to talc-free bodies was found to withstand autoclave treatment without crazing, and ware so made stood up very well in service tests.     

DENSITIES AND DERIVED THERMODYNAMIC PROPERTIES OF THE BINARY SYSTEMS OF BENZENE WITH BUTYL METHACRYLATE,ALLYL METHACRYLATE,METHACRYLIC ACID,AND VINYL ACETATE AT 298.15 K

Densities of the binary systems of benzene with butyl methacrylate, allyl methacrylate, methacrylic acid, and vinyl acetate have been measured as a function of the composition, at 298.15 K and atmospheric pressure, using an Anton Paar DMA 5000 oscillating U-tube densimeter. The calculated excess molar volumes were correlated with the Redlich-Kister equation and with a series of Legendre polynomials. The excess molar volumes are positive for the four binaries studied.     

PREPARATION AND ADSORPTION PROPERTIES OF THE POLYSTYRENE RESIN HAVING DIETHYLENETRIAMINE-N,N′- BIS(METHYLENEPHOSPHONATE) GROUP

Styrene-divinylbenzene copolymer beads containing diethylenetriamine-N,N′-bis(methylenephosphonate) group have been synthesized. The adsorption properties, of the present resin for some trivalent and bivalent metal ions have been examined. The selectivity sequence of the present resin at pH lower than 2.0 is as follows: Ga(III)> A1(III)> Sm(III)>Cu(II)>Co(II)>Zn(II)>Ca(II). The present resin reveals remarkable selectivity for the trivalent metal ions. The selective concentration of In(III) Ga(III) and Sm(III) from an acidic aqueous solution has been demonstrated by using a column of the present resin.     

INVESTIGATION OF CHEMICAL AND ELECTROCHEMICAL CHANGES WITHIN CORROSION CRACKS——Ⅰ.Interrelations between Currents,C1~- migration and pH values

A simulated occluded corrosion cell was used to study the changes within corrosion cracks or crev-ices of 1Crl8Ni9Ti austenitic stainless steel in NaCI solution.As anodic currents passed through thecell,a series of changes took place,the most important of which were pH fall and CI-migration.Itwas found that the pH fall is proportional to current density and duration of current flowing,consequentlyit is a function of the quantity of electricity passing the occluded anode.The pH in the occluded cellmight be negative value when current density was 3.5mA/cm~2 after 168 hours.Meanwhile the CI-migratedinto occluded cell increased the CI-concentration 18 times as much as the original concentration.A linear relationship existed between CI-migration in g-equivalents per cm~2 of anode area and currentdensity,and also a linear relation existed between CI-migration per hour and current intensity.Conse-quently,the number of equivalents of CI-migration into crack tip was proportional to the quantity ofelectricity passing through it.It was interesting to discover that for each faraday passed almost always1/2 g-equivalent of CI-migrated into the occluded cell.This relationship did not change whatever werethe concentration of bulk solution,current density,temperature,and time elapsed.Two empirical for-mulas regarding the relationship between pH and Cr~3 dissolution or Cl-migration respectively werederived based on the relationships between quantity of electricity passed and other variables found in thepresent experiments.     

V-L EQUILIBRIUM OF WEAK ELECTROLYTE SOLUTION OF THE NH_3-CO2-H_2O,NH_3-H_2S-H_2O AND NH_3-SO_2-H_2O SYSTEM

In this paper we have systematically studied V-L equilibrium in ternary aqueous solutions containingvolatile electrolytes by introducing a ternary interaction term into Edwards generalized molecular thermody-namic model and optimizing several adjustable parameters.The program PARA9 with flexible functions ofdoing a series of calculations has been developed and carried out on a TQ-16 computer.It can be usedeither for directly calculating the V-L equilibrium or for optimizing the adjustable parameters.For the sys-toms(NH_3-CO_3-H_2O_3,NH_3-H_2S-H_2O and NH_3-SO_2-H_2O)satisfactory results have been obtained withrelative mean deviation of 5-10%.Besides,several sets of adjustable parameters and valuable information ofactivity coefficients,equilibrium concentrations of ions and molecules in solutions are obtained.