SU108558A1 - Electrothermal silicon carbide production method in electric furnaces - Google Patents

Description

Methods are known for electrothermal production in e.tech silicon carbide furnaces in a single step without boron content.

A distinctive feature of the proposed method is to obtain by melting in two stages silicon carbide with a content of dissolved boron. This provides an increase in the abrasive ability of the abrasive material to be obtained with a Si content of 54 to 56 o)

With „23„ 24, 1 or Si С from 77 to 80Л. In „15„ 17. | {impurities of Fe, A1 and others from 8 to 3.

When implementing the proposed method, the initial raw materials 1 and are:

a) Technical boric acid or products of its remelting and the form of dehydrated boric anhydride (B, O.), or unreacted products obtained by the proposed method from the first stage of the boronization process of silicon.

b) Technical. Metal silicon - with a content of 81 from 92 to 98% fineness of about 2 mm.

c) Low-ash grades of petroleum coke with a zo. ay content not bo, i.e. 0, and a particle size of about 0.7 mm.

The process of producing boron oxide silicon carbide is a two-stage: n1l1 .m;: carried out separately in the corresponding electric furnaces.x.

The first stage of the process consists in boring due to its setting up stage in the V., 0h, with a high 1x terapery of the arc electrOchech. This process can be combined with a single process. dehydrate and technical

BORPO acid.

The second stage of the process is associated with the binding of Si with nomon; the exact amount of carbon metered from the products of the first stage of the process into crystalline silicon carbide with non-boron boron in it and the formation of solid particles. alignment.

Both stages of the process of obtaining these intermediate and final products are installed in any type of open or closed type electric furnaces, in order to trap gaseous smelting products or to operate the furnace at pressures above atmospheric.

Perna is in progress. for example li case nciio. b3Oiui iiui dglioii electric furnace 6e: i with its iodine, consists in the fact that it is heated and p; 1c) tsuk) pegyg, it loads up vain and eremet; a mixture of i :) and fine, (or; oi. 10. I, 1N and meta ethical silicon O2 O2.

a) Bopncii Ki.c..OTiii to 1ta...tiches to o, 1 ;. K re m m and lo (2.8 ... o, o): and .i and sotsististype

b) i)., C). to the meta..umeric iqn-Miyu (G, 48, ... 1.68): 1,

P. is led from the city of GO;; -, ai1IlTOBaiiiibiM Ko.iOuniHKO.M iri for the time of battle 11Oil to) I1ihs fak.to li loading ig. The place is fresh giyhty. FliaitKa is pumped up by io jailav.ioni -; block, commensurate to scale By cooling the furnace out of it.in. ekaets b.kzh, which consists of :; Borosktaknogo nktak. iipouiKiainioro of a meta-1.1.1-shaped species of the king of a different size, 1.1111111, partly boronovy and ny to repair the ip; em, derived from ii.iaBKH in the nerve stage of the process and material, . the slag and metal is crushed to the edge (5 or O K) mm n per m-1 of capacity from M; ICHIT; Ibov nechi E.1 I BTopoii process stages,

To io, 1xp1 of the mix of materials from the stage of the process, oil coke is added, about 0.7 mm 1) by weight ratio of 16: 5 to 1% of masses to 300 400 cat. taking into account the loss of coke in the limit. x 11 20 from the required for but. li 1; ronesse Si Si bottoms,

A mixture of a mixture of these materials is subjected to a secondary non-arc furnace in the arc of the same type as for the first stage of the process. The start-up of the furnace gf.aavka of the second stage is the same as for the first, with that OT.IH such that a mixture is fed to the process of the second stage. The smelting process is carried out in a pa block with deep zinc alloy

kolp1niki iri methodical.m precipitation and uputnenii 1 fir,

After the welding of the bead and its cooling in nechi, it is known from it, 15 of the lower part of the hedgehog with iodine electrodes forms the proper thickness and diameter, and a silver product with a medium CToii crystal structural pattern; very dense structure, which is presented. 1 em borirovappy carbide crepp.

Osp. Swine matter. n, tav1chI, tegko otdet. from the surrounding ptak and c. Yes. d., 1 but. 1 of the abrasive grains and micronuclei of different numbers from it, 1. and non-reactions to the nose. These fractions serve as an addition to the BTOpoii stage of the process.

A characteristic feature of boronized silicon carbide is the absence of a free angle to it. 1fang, and that is nos1o, 1t it is easy to understand the process of obtaining high-quality MIIKpOHOpOHJKOB from such an abrasive material.

Subject invention

1, Electrothermal method 11O, 1 of the study of silicon carbide in, 1, their furnaces, about t /; and h and y c and ii with those. that, for the purpose of its new abrasive ability, but it is noted that by the technology, in two stages, silicon carbide with a content of dissolved boron,

2, Priya, m of the implementation of the method according to n, 1, o t, 1 fct. P1. and with the fact that with the purpose of dissolving boron, nacelle silicon with boron is produced to the first stage, by ciKiaB.ie and boric acid with meta, lytic silicon in a strong, 1 ratio from 2.8 to 3.0 to 1, or boric anhydride in a weight ratio of from 1.48 to 1.68 to 1,

3, Acceptance of the synthetic resin. 1, 1, 1, 2, 1, 2, and so on, and II, and the fact that, to create silicon carbide with S1 content from 54 to 56 i.

C "23" 24%: or S) C from 77 to B "15" 17,., IipiiMtceii Ff, Al and others from 8; i, o, and the product of the first stage is melted and HTOpOii stains sp / ai with ialb uiv-iepo; i iCTb M NUJteria .um. for example, petroleum coke from IJCCOISOM cooTHOinenm 16 to 5.