Refractories and Industrial Ceramics l~bl. 38, Nos. i -_." .t997 UDK 666,762.3-486 SHAPED REFRACTORY ARTICLES BASED ON FIBROUS COMPOSITE MATERIALS L. A. Karpets 1 and T. A. Kononova 1 Translated from Ogneupow i Tekhnicheskaya Kemmika, No. 1, pp. 31 - 32, January,, 1997. Origznal article submitted November 12, 1996. Production of shaped refracto~ articles based on fibrous composite materials (FCM) is brought to a commer- cial level at the Pe~'oural'sk silica brick plant. The use of molten periclase dust as a ceramic filler and the introduction of a silicon-containing admixture make it possible to increase the strength of the articles and to raise die working temperature to IO00~ At the Pervoural'sk silica brick plant, production of At present, experimental batches of jackets tbr thermo- couples are being tested in vacuumized mixers and gas-fired shaped refractory articles based on fibrous composite materi- als (FCM) is brought to a commercial level. The production aluminum-smelting furnaces at 700-800~ The tests are being conducted at the Kamensk-Ural'sk copper-smelting technology includes impregnation of the silica substance by a ceramic constituent binder. Until recently, chromium-magne- plant. Jackets for thermocouples are also being tested at the Ural aluminum plant. The articles are mounted in furnaces tbr sia spinel was used as a ceramic filler despite its negative ef- fect on humans (the spinel belongs to the group of materials smelting aluminum and in rotating furnaces for alumina pro- duction with an operating temperature up to 1000~ of second-class risk). The research laboratory of the Pervouml'sk silica brick Testing of jackets for thermocouples was successfully plant in cooperation with workers of the ~VbstIO (Eastern In- completed at the "vblzhskii automobile plant. The work car- stitute of Refractories) developed a new production technol- fled out in cooperation with this plant resuited in an order for ogy for FCM articles and replaced chromium-magnesia production of 4000 articles in 1997 and in an integrated pro- spinel by dust of molten periclase. In addition, a silicon-con- gram of scientific and technical cooperation in extending the taining admixture was introduced to increase the stren~h of assortment of articles based on fibrous composite materials. the articles and to raise their working temperature to 1000~ The laboratory of the Pervoural'sk silica brick plant con- The assortment and purpose of the FCM-based articles tinues work to improve the service properties of FCM-based are as follows: articles. A production technology, for articles having a poro- jackets for thermocouples of different dimensions (inter- sity up to 35% is now being developed. nal diameter from 14 to 50 mm, external diameter from 20 to 80 ram, length 300- 1200 ram), in accordance with technical specification TU 14-202-45- 95. The jackets work in heat TABLE 1. Physicochemical Parameters of FCM-based Articles units under steady-state and periodic conditions at tempera- According to According to tures up to 900~ Parameters the specification the specification TU 14-202-45-95 TU 14-8-430-89 metal-transporting pipes for cas'dng of nonferrous metals Mass fraction, %: in accordance to specification TU 14-8-430-89 (operating SiO 2 28 - 40 20-25 temperature about 800~ CaO, no more than 5 2 Parameters of FCM-based articles are presented in Ta- MgO, no less than 45 ble 1. FCM-based articles are readily amenable to turning. 4-8 P205 Using machining methods, a set of articles consisting of a Porosity, %, no more than 50 40 - 60 spherical support and a flange was produced for the vacuu- Thermal stabili D' ( i 200~ - air), mizer of the oxygen-converter shop at the Magnitogorsk iron thermal cycles, no less than 50 and steel works. The set has been running successfully at the Compressive strength limit, IvlPa, works from the middle 1996 instead of the fabric-based lami- no less than, for articles with external diameters of: nate equipment used earlier. < 10ram 3 10-25 mm 6 Pervoural'skii Dinasovyi Zavod Joint-Stock Company, Pervoural'sk, > 25 mm 8 Russia. 0~3-487 L'97.'3801-037S 18.00 .~ 1997 Plenurn PuNishing Corporation
Refractories and Industrial Ceramics – Springer Journals
Published: Nov 27, 2007
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