Effect of Refractory Structure on Operating Properties

2019 ◽  
Vol 59 (6) ◽  
pp. 606-608
Author(s):  
A. Z. Isagulov ◽  
V. Yu. Kulikov ◽  
S. S. Kvon ◽  
A. M. Dostaeva ◽  
E. P. Shcherbakova
Keyword(s):  
Refractory Structure ◽  
Operating Properties

Study of operating properties of aanticorrosion packing papers

2020 ◽  
Vol 76 (10) ◽  
pp. 1021-1027
Author(s):  
A. P. Ponomarev ◽  
L. G. Kolyada ◽  
E. V. Tarasyuk
Keyword(s):  
Steel Strip ◽  
Low Carbon Steel ◽  
Strength Characteristics ◽  
Low Carbon ◽  
Operating Characteristics ◽  
Packing Materials ◽  
Accelerated Corrosion ◽  
Operating Properties ◽  
Deformation And Strength Characteristics ◽  
Anticorrosion Properties

Metal products are subjected to atmospheric corrosion during transportation and storing. An important way to prevent this negative phenomenon is application of special packing materials, in particular materials, containing volatile inhibitors of corrosion, which protect metal against various corrosion agents. To protect metal effectively it is necessary to provide a definite level of operating characteristics of packing materials. The purpose of the work was the study of operating properties of inhibited crepe, inhibited and laminated polyethylene film, inhibited crepe and reinforced by polypropylene web papers, manufactured by OJSC “PP TechnoKhim”, Magnitogorsk, used for packing of metals. Structural and dimensional, sorption, deformation and strength characteristics, of the studied anticorrosion papers are presented, the characteristics being calculated based on the results of measurements. To determine their physical-mechanical and anticorrosion properties, standard methods and methodologies were used. To evaluate impact of moisture and transportation conditions, indices of water adsorption and wear of the studied papers were determined. Inhibitor content in these materials was determined by thermogravimetric analysis method. Their protective ability was studied on samples of low carbon steel strip. For accelerated corrosion tests the strip samples were degreased by alcohol, dried in air and packed in the studied anticorrosion papers, after that they were exposed under increased temperatures and moisture conditions. It was determined, that among the materials under the study, the inhibited crepe paper, reinforced by polypropylene web, hhas the best complex of physical-mechanical and anticorrosion properties. It provides a higher level of prevention corrosion of metal l and surpasses other materials in a number of deformation and strength characteristics. Recommendations were proposed to improve qquality of produced anticorrosion papers.

scholarly journals Design of Magnesia–Spinel Bricks for Improved Coating Adherence in Cement Rotary Kilns

Ceramics ◽  
2021 ◽  
Vol 4 (4) ◽  
pp. 652-666
Author(s):  
Graziella Rajão Cota Pacheco ◽  
Geraldo Eduardo Gonçalves ◽  
Vanessa de Freitas Cunha Lins
Keyword(s):  
Formation Mechanism ◽  
Firing Temperature ◽  
Essential Role ◽  
Refractory Lining ◽  
Refractory Structure ◽  
Prolonged Operation ◽  
Magnesia Spinel ◽  
Coating Formation ◽  
Rotary Kilns ◽  
Coating Formation Mechanism

It is well known that doloma bricks present better coating adherence than magnesia–spinel bricks when applied in cement rotary kilns, which is related to the different coating formation mechanism. The coating has an essential role in prolonged operation by protecting the refractory lining; thus, it is important to improve its adherence on magnesia–spinel refractories. The objective of this investigation is to study different compositions of magnesia–spinel bricks, achieved by varying additives used (calcined alumina, limestone, hematite and zirconia) and firing temperature (1500 °C and 1700 °C), to enhance the coating adherence measured by the sandwich test. The results have pointed out that the use of higher firing temperature contributes positively to physical adherence due to well-sintered refractory structure and elevated permeability, attaining coating strength superior to 2 MPa. For the chemical adherence, the addition of 2 wt.% of limestone increased the coating strength to 3 MPa, but resulted in a drop in hot properties. In this context, the most suitable approach to improve adherence of clinker coating and maintain hot properties in suitable levels is to increase the firing temperature.

scholarly journals Researches on development of alumina-chromia-zirconium silicate refractories containing 60 % Cr2O3

2020 ◽  
Vol 120 ◽  
pp. 12-28
Author(s):  
P. O. Kushchenko ◽  
V. V. Primachenko ◽  
I. G. Shulyk ◽  
Yu. Ye. Mishnyova ◽  
K. I. Kushchenko ◽  
...  
Keyword(s):  
Corrosion Mechanism ◽  
Pressing Method ◽  
Refractory Structure ◽  
Oxide Addition ◽  
Zirconium Silicate ◽  
Cold Crushing Strength ◽  
Cr2o3 Content ◽  
Corrosive Effect ◽  
Dry Pressing ◽  
Shock Resistance

Researches of a branch composition and firing atmosphere influence on structure and properties of pressed alumina-chromia-zirconium silicate refractories with 60 % Cr2O3 content were carried out. The optimal branch composition which after firing in oxidizing atmosphere provides obtaining of samples with open porosity 24.8 %, apparent density 3.46 g/cm3, cold crushing strength 78 N/mm2 and thermal shock resistance by 950 ºС — water — 7 thermal cycles was established. The phase composition of samples was determined. It has been shown that, firing in a reducing atmosphere, as well as titanium oxide addition, have no significant effect on samples properties. Corrosion resistance comparative researches of alumina-chromia-zirconium silicate refractories with 60 % Cr2O3 content and refractory brand KHTSS-30 with 30 % Cr2O3 content to glass «E» and basalt melts by crucible method at a temperature of 1580 °C with an exposure time of 8 hours were carried out. It has been established that, glass «E» and basalt impregnate refractories, moreover for samples with the developed optimal composition the impregnation depth was the smallest in comparison with samples of other compositions. The corrosion mechanism has been established, which consists in the penetration of glass «E» and basalt melts into refractory with further dissolution of corundum grains in them. Sintered Cr2O3 and solid solutions based on it in the composition of samples prevent corrosion, reducing the interaction area of melts with corundum grains, and when exposed to basalt melt, also forming spinelid with its components, which slows down further penetration of melt into refractory structure, thereby reducing its corrosive effect on the refractory. Based on the obtained results, a technology of a new domestic type of product (alumina-chromia-zirconium silicate refractories with 60 % Cr2O3 content manufactured by semi-dry pressing method) was developed.

Operating properties of electrofusion cast baddeleyite-corundum refractories

1966 ◽  
Vol 23 (3) ◽  
pp. 122-126
Author(s):  
L. L. Chernina ◽  
G. N. Kholina
Keyword(s):  
Operating Properties ◽  
Electrofusion Cast
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