New AZS Chromic Oxide Refractory for Wool Fiber-Glass Melting Furnaces

The experience of the chrome-oxide refractory materials application in the electric glass-melting furnaces for fberglass production is given in the article. The prospects are noticed of the chrome-oxide refractories using from the point of view of both the service reliability and the furnace campaign length.Ill.4. Ref. 7. Tab. 5.

Download Full-text

Research of grain composition batch influence on alumina-zirconium silicate and alumina-chromia-zirconium silicate refractories properties

Scientific research on refractories and technical ceramics ◽

10.35857/2663-3566.118.02 ◽

2018 ◽

Vol 118 ◽

pp. 16-25

Author(s):

V. V. Primachenko ◽

I. G. Shulik ◽

Yu. Ye. Mishnyova ◽

K. I. Kushchenko ◽

Yu. O. Krakhmal

Keyword(s):

Grain Size ◽

Mechanical Treatment ◽

Glass Melting ◽

Melting Furnace ◽

Chromic Oxide ◽

Glass Melting Furnace ◽

Grain Composition ◽

Complete Replacement ◽

Chrome Oxide ◽

Zirconium Silicate

Comparative researches of grain composition batch influence with electrofusion corundum aggregate with a maximum grain size 2.0 mm or 1.0 mm on properties of alumina-zirconium silicate KTSS brand and alumina-chromia-zirconium silicate KCHTSS-30 and KCHTSS-15 brands refractories were carried out. It was established that, from batches with maximum grain size 2.0 mm and fraction content < 0.5 mm 20 % it is possible to obtain refractories with properties that approximate to the properties of refractories from batches with maximum grain size 1.0 mm and fraction content < 0.5 mm 10 %. It was shown that, for the manufacture of alumina-chromia-zirconium silicate refractories from optimal grain composition batches it is advisable to use metallurgical and pigment chromic oxide in the ratio of 2 : 1 or complete replacement of chromic oxide with mud, forming during mechanical treatment of chrome oxide refractory products. The developed compositions of batches make possible to increase efficiency of using electrofusion corundum in the manufacture of alumina-zirconium silicate and alumina-chromia-zirconium silicate refractories. Obtained results are used at making of products for glass melting furnace of industrial lining for fiberglass production from E glass.

Download Full-text

The internal structure of medullated wool

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100111987 ◽

1984 ◽

Vol 42 ◽

pp. 388-389

Author(s):

Leo Barish

Keyword(s):

Light Microscopy ◽

Internal Structure ◽

Wool Fiber ◽

Guard Hair ◽

Bright Field ◽

Wool Fibers ◽

Thin Skin ◽

Air Pockets

Although most of the wool used today consists of fine, unmedullated down-type fibers, a great deal of coarse wool is used for carpets, tweeds, industrial fabrics, etc. Besides the obvious diameter difference, coarse wool fibers are often medullated.Medullation may be easily observed using bright field light microscopy. Fig. 1A shows a typical fine diameter nonmedullated wool fiber, Fig. IB illustrates a coarse fiber with a large medulla. The opacity of the medulla is due to the inability of the mounting media to penetrate to the center of the fiber leaving air pockets. Fig. 1C shows an even thicker fiber with a very large medulla and with very thin skin. This type of wool is called “Kemp”, is shed annually or more often, and corresponds to guard hair in fur-bearing animals.

Download Full-text