SU903326A1 - Refractory fiber - Google Patents

Description

(54) REFRACTORY FIBER

The invention relates to the production of refractory volts and can be used as thermal insulation in thermal units with an operating temperature of 1400 ° C. Known refractory fiberglass, obtained on the basis of the melt, including, SiOj. and CrGO, Cd. However, they are distinguished by a large content of non-fibrous inclusions. The closest in composition to the proposed fiber is a fiber containing, in weight,%: 48.60; , 52 0.15; MgO traces; SaOchüci; , 057.53; MdiOO, 10; KgO O, lO and obtained from the charge, including quartz sand and alumina in the ratio 50: 50 2. The fiber obtained from this mixture also has a high kept-up of non-volatile inclusions and a rather large linear shrinkage after firing, which limits the application temperature kx to. The purpose of the invention is to improve the properties of glass fibers by reducing their linear shrinkage and the number of non-fibrous inclusions. The goal is achieved by the fact that the refractory fiber including. Л1гОз, StOj, FejOj, MgO. CaO. , MD OiKg O, additionally contains. OR with the following components, wt.%: 37.7 - 66.9 26.05 - 49.96 0.37 - O, 42 O, O5 - O, 08 0.16 - O, 53 6.2 - 10.8 O, O8 - 0.28 0.04 - 0.23 0.10 - 0.18 To obtain a refractory fiber of the composition indicated, a mixture is used containing 10 -10% quartz sand and 5O- 9O% catalyst waste rubber39033264

production, the chemical composition of the refractory fiber is obtained in% by weight: AtiO 73-75; SiOj. 6-9; shivnie mixture in a 1-shaped mix Cztflz 13-15; MpO O, 1-O, 2; Re, .O O, 2-ne for 7-10 min. To obtain a sc0, 6; CaO 0.1-O, 0, l-O, 2; RjO / Q 04-inherent mass, then melted in ECU O) 0.5-O, 6.5 arc furnace (voltage 90 V, power

In its phase composition, waste mm is inflated with energy carrier at

They are mainly Grains at a pressure of 4-6 MPa.

rund in a cryptocrystalline state. The refractory fiber of the specified pine whose surfaces are tiny Yugawa, obtained from the proposed mixture, less than 3 microns, adsorbed grains is characterized by the content of nevoloneks. Among cryptocrystalline inclusions, equal to 1.2-1.9%, the clayey substance is encountered in part. The application temperature is up to 1,400 ° C. In Table. I presents examples of quartz in an amount of 5-7%. Grapes t5 tara proposed refractory fibers are surrounded by glassy shells,. on. the vitreous matter also occurs as individual chagots.

Seeming with

density,

The number of non-fibrous inclusions of 0.5 mm and above,%

Linear shrinkage of the fibers after 4-hour roasting,%, with

14OO ° C

. current 1.0 kA), melt stream diameter

In tab. 2 shows the properties of the proposed fibers.

Spreadsheets

130

134

156

2.6

0.8

1.1

2.3

1.9

1.9

Claims (2)

4.7 3.6 5 90 The formula of the invention Refractory fiber, comprising ,, SiOj. , FejOj, MgO, CaO ,, 05, NdjO and ICjO, distinguishing it, then, with the aim of both with curing the possibility of reducing the number of non-fibrous inclusions during its manufacture and; The length of the linear fiber coupling, it additionally contains M & A with the following ratio of components, wt.%: AtiO, 37.7 - 66.9 StOi 26.05 - 49.96 P.37 - 0.42 MgO 0.05 - 0.08 266 QaO 0.16 - 0.53, 6.2 - 10, 8 0.08 - 0.28. 0.04 - 0.23 M & E 0.10 -0.18 Sources of information taken into account during the examination I. US Patent N 3449137, cl. C 03 S 13/00, published; 1969. 2. Gaodu A.N., et al. Refractory fibers from natural, -Ogneupory, 1975, Nr 8, p. 7-9 (prototype).