SU1357121A1 - Double-layer bearing - Google Patents

Abstract

The invention relates to the field of metallurgy, and specifically to compositions of heat insulating and exothermic mixtures for two-layer liners used to insulate a metal mirror when casting it into molds. The purpose of the invention is to increase the yield of a suitable metal — by applying a two-layer insert consisting of a layer of heat-insulating mixture of the composition, in wt.%: Quartz grains of the production of crystalline silicon 65-85; wood otsilki 10-25; Sulfite-alcohol bard 5-10 and a layer of exothermic mixture composition, wt.L: waste chips of aluminum-magnesium alloys 10 - 15; manganese ore 20-30; spent flgos electric steel production mark ANF-1 or ANF-6 45 - 50; Sulfite-alcohol bard 10 - 20, Due to the combination of high thermal insulation properties of the corresponding layer, liner and optimal burning characteristics of the exothermic mixture with its sufficient calorific value, a two-layer insert placed on the mirror of the near-bottom metal has an increased warming capacity, which allows reducing to 9, 7 - 10.8% head trim ingots weighing 0.5 - 6.2 tons. 2 tab. (L with SP yu

Description

11357J212

The invention relates to metallurgy. From the data of Table 2 it follows that the extrusions, namely, the compositions of the thermal insulating thermal insulation properties of the mixture

pyronyix and exothermic mixtures for the insulating liner layer in

bilayer liners used with combining with burning characteristics

for warming the metal mirror at its mixture of the exothermic layer of the liner

casting into molds. at a sufficiently high calorific value

The purpose of the invention is to increase the capacity of the exothermic composition of a suitable metal, which provides for obtaining

To prepare a mixture of heat-insulating yields of a suitable metal of the insert liner layer, the properties of which are insulated with a double-refractory filler are used in a layer insert according to the invention of quartz grind production. tallic silicon containing

Claims (1)

oxide of silicon iodine in the amount of 98%, Frak-15 The formula of the invention for quartz grains is in the range of 0-2. Two-layer liner for insulation Used to prepare the metal surface in a mold with a mixture of an exothermic layer of a steel casting, containing heat-shaving of aluminum-magnesium alloys, a 20fouling layer of refractory material AL8 and AJ127 before using from the real and the binder and exothermic are reduced to fractions of no more than 3 mm. a layer of combustible oxidizer and bonding agent; In the spent flux of an electrostatic plant, characterized in that the melting production of grades ANF-1, in order to increase the yield of a suitable and ANF-6 calcium fluoride content of 25 metals, pre- oliruyuschy layer should be in the range 60 -polnitelno wood sawdust contains 85 wt.%. ki and as a refractory material Table. given the composition of the heat la quartz grit production insulating and exothermic mixtures of crystalline silicon with the next four variants of the proposed ratio, wt,% of two-layer liners of Okvartsevka grains The manufacture of the liner is carried out as follows: crystalline Separately prepare heat, silicon 65-85 molar and exothermic mixtures of pu-. 35 Woody mixing the dry ingredients of sawdust 10-25 with the subsequent addition of the necessary. A binding amount of 5–10 amounts of sulfite-alcohol bardic exothermic layer is additionally with a density of 1.17–1.23 g / cm. First of all, contains the spent electrolyte flux at a pressure of 0.1 Pa, 40 melts are pressed onto the heat-insulating layer of the deposit. Due to calcium fluoride, exothermic fuels are poured onto this layer as the threads — the waste material is an aluminum-magnetic mixture at a pressure of 0.2 alloys and the l-manganese ore deposits are oxidized to the next layer. Thus, a double layer is obtained; 45 ratio, wt.%:. 40–50 mm thick inserts. Chip waste, and the heat insulating layer of the composition of aluminum is 40-50% of the liner thickness. alloys 10 - 15 Margantseva Drying of the made inserts pro--gg ore 20-30 is exhausted at 150 - for a spent flux of 3 - 5 h, electric-arcing Table 2 presents the properties. of the production of heat-insulating and heat-insulating mixtures based on the fluoride layer of the liner according to the invention - with calcium 45-50, as well as the results of the test. Binder 10-20 bilayer inserts when insulating at the same time, both layers as a bond mirror of the metal of the profit ingot contain sulphite-alcohol weighing 0.5 to 6.2 tons barda. Heat conductivity coefficient of heat insulating mixture, W / mK Thermal diffusivity of heat-insulating mixture at 1200 ° С, m / s-10 table 2 0,22 0,20 0.30 0.30 0.20 0.17 0.24 0.24 Flash point exothermic mixture, C, burning temperature, C Duration of burning the insulating layer of the liner, min The burning rate of the exothermic mixture, g / s Heat production capacity of the exothermic mixture, kJ / kg Head trim,% Continuation of table 2 810 790 790 810 1246 1250 1244 1236 10.5 12.0 7.5 7.05 23 .24 25 22 1580 1590 1580 1530 10.8 9.7 9.7 10.8