ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1957.tb12584.x

出版商:Blackwell Publishing Ltd    

年代:1957

数据来源: WILEY

摘要:

The effect of mechanical stress during the drawing process on the strength obtained was determined for large‐diameter fibers of soda‐lime‐silica glass. Fibers were formed by down‐drawing cane at a constant rate, using loads of from 100 to 8000 gm. Tensile strength was determined by transverse loading on annealed specimens. The results showed that the variation of temperature and load during forming increased the strength of the drawn fiber as much as 62%. The tendency toward increased strength persisted, but to a lesser extent, after the surface of the fibers was

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1957.tb12585.x

出版商:Blackwell Publishing Ltd    

年代:1957

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1957.tb12586.x

出版商:Blackwell Publishing Ltd    

年代:1957

数据来源: WILEY

摘要:

A compound, identified by X‐ray diffraction analysis as sodium metatantalate (Na2Ta2O6), was found at the interface between a sodium silicate glass and tantalum metal which had been heated in vacuum to 1000°C. Thermodynamic calculations, followed by further experimental evidence, were used to determine the chemical reaction between tantalum and sodium silicate which resulted in the formation of Na2Ta2O6. The compound was synthesized by other methods and its structure was investigat

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1957.tb12587.x

出版商:Blackwell Publishing Ltd    

年代:1957

数据来源: WILEY

摘要:

Liquidus temperatures, obtained by the quenching technique, are presented for mixtures in the system iron oxide–Al2O3–SiO2in air atmosphere. Approximate compositions of crystalline phases in equilibrium with liquids have been determined, and paths of equilibrium crystallization are discussed briefly. Application of the phase diagram to refractories problems is indica

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1957.tb12588.x

出版商:Blackwell Publishing Ltd    

年代:1957

数据来源: WILEY

摘要:

Previous investigators have indicated that both small particles and the addition of certain oxides promote the sintering of alumina at temperatures below 1700°C. By utilizing combinations of oxides and small particle size, the sintering temperature of 96% alumina bodies was reduced in this investigation to the 1300° to 1400°C. range. It is proposed that this low‐temperature sintering is aided by the formation of a liquid phase. Thin sections of the alumina sintered at low temperatures revealed bodies with small grain size whose bulk densities were above 3.80 gm. pe

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1957.tb12589.x

出版商:Blackwell Publishing Ltd    

年代:1957

数据来源: WILEY

摘要:

The oxidation of manganese ferrite (MnFe2O4) in air has been studied in the temperature range 750° to 1150°C. Between 1050° and 1150° a homogeneous oxidation takes place, resulting in a spinel phase of a defect type containing up to 10% of the manganese in the trivalent state. At 1050° and below, bixbyite (Mn2O3) and hematite (Fe2O3) are precipitated. The kinetics indicate that initially a diffusion‐limited homogeneous reaction takes place, followed by precipitation and grain growth. At lower temperatures, well‐defined Widmanstätten precipitates are formed; at higher temperatures, recrystallization alters these precipitates. The oxidation of manganese ferrite can be strongly retarded by a ceramic glaze, offering a practical method of preparing the material by a

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1957.tb12590.x

出版商:Blackwell Publishing Ltd    

年代:1957

数据来源: WILEY