CN1084150A

CN1084150A - The middle water containing opening silicon nitride combined with silicon carbide refractory material

Info

Publication number: CN1084150A
Application number: CN 93112546
Authority: CN
Inventors: 潘裕柏; 江东亮; 谭寿洪; 王菊红
Original assignee: Shanghai Institute of Ceramics of CAS
Current assignee: Shanghai Institute of Ceramics of CAS
Priority date: 1993-09-03
Filing date: 1993-09-03
Publication date: 1994-03-23
Anticipated expiration: 2013-09-03
Also published as: CN1045281C

Abstract

The present invention relates to the refractory materials that middle water containing opening is used, belong to the refractory materials of non-oxidized substance system.The concrete component of the carborundum refractory of silicon nitride bonded silicon provided by the invention is (wt%) SiC50-80, Si ₃N ₄10-30, Al ₂O ₃5-20.Maximum particle size is 20-120 orders.Material provided by the invention can be made into monoblock type or the formula middle water containing opening of inserting, and is used for the casting stainless steel base and draws reinforcing bar, can replace high alumina matter, zirconium matter or the aluminium carbonaceous material of present use.

Description

The middle water containing opening silicon nitride combined with silicon carbide refractory material

The present invention relates to the refractory materials that middle water containing opening is used, relate to the carborundum refractory of silicon nitride bonded silicon more precisely, belong to non-oxidized substance series refractory material field.

As everyone knows, silicon carbide (SiC) material has strong covalent bonds characteristic (the covalent linkage occupation rate is 89%) and has satisfactory stability so give it; Have simultaneously and be only second to adamantine hardness, give it and have good wear resistance.It has higher high temperature strength, high heat conductance, the low coefficient of expansion and good thermal shock resistance simultaneously, it is become have excellent high-temperature behavior, low bulk, wear-resistant, corrosion resistant refractory materials condition is provided.

Early stage carborundum refractory utilizes clay, silicon oxide and silicate in conjunction with making, demonstrated than wear-resisting, the anti-thermal shock of high alumina matter commonly used, zirconium matter, alumina-carbon material excellence and the character of high thermal conductance, be widely used in roasting kiln, combustion chamber, shield cap and kiln in non-ferrous metal metallurgy industry.In the seventies, appearance along with silicon nitride combined with silicon carbide refractory material, with its good anti-highly basic, anti-oxidant, high thermal conductance, high strength (high temperature under room temperature and 1400 ℃), good thermal shock resistance and high-temperature wearable damage property, satisfied the requirement of blast-furnace technique development, stove work-ing life is brought up to more than 10 years even can be longer from original 4-6 refractory materials.Therefore, the silicon carbide of silicon nitride bonded silicon has caused that as the refractory materials of a new generation various countries extensively pay attention to.

At present, the normally used refractory materials of middle water containing opening is high alumina matter, zirconium matter, aluminium carbonaceous both at home and abroad, and the subject matter that exists in the use is:

(1) being subjected to corrosion penetration, mainly is the low melting point oxide CaO in the slag, Na ₂O etc. react with refractory materials;

(2) dross mainly is because the reaction down of molten steel and refractory materials high temperature; Oxygen causes the oxidation precipitation of steel by the infiltration of the pore in the refractory materials; Inherent Al ₂O ₃The temperature difference at impurity or the reduction reaction precipitation and the mouth of a river, generation is solidified.

The objective of the invention is to replace the high alumina matter, zirconium matter or the aluminium carbonaceous material that use at present and make middle water containing opening, improve the life-span, improve the quality of molten steel with silicon nitride combined with silicon carbide refractory material.

The present invention is the carbofrax material that processing step such as the batch mixing, moulding, sintering, detection by general refractory materials is made the silicon nitride bonded silicon that middle water containing opening uses, and concrete steps are Fig. 1

Thick or medium SiC powder is generally 20 orders～200 orders, and thick or intermediate SiC was generally 5: 1: 4 or 4: 2: 4 with the blending ratio of thin SiC powder, and binding agent is an ordinary resin, nitriding temperature be 1400 ℃ 50 hours, sintering 1600 ℃ again heats up after the nitrogenize.

The main component of silicon nitride combined with silicon carbide refractory material provided by the invention is (wt%):

SiC 50-80

Si ₃N ₄10-30

Al ₂O ₃5-20

The maximum particle size scope is the 20-120 order

Table 1 is the basic physical properties of the silicon nitride combined silicon carbide material of 5 kinds of compositions of the present invention's selection.

Table 2 is that the folding strength after the oxidation of the described 5 kinds of composition differing tempss of table 1 changes.The result shows that folding strength does not only reduce after 500 ℃, 800 ℃, 1400 ℃ oxide treatment, but also slightly rises, especially intensity increasing degree maximum after 1400 ℃ of 10hr oxidations, and the increasing weight of oxidation of matrix be directly proportional with void content (table 3).

* number component with table 1

* number component with table 1

As the embodiment of the invention 1 is that any one makes the inserted mouth of a river in the 1-5 component with being numbered among the above-mentioned table 1-3, cast scale steel billet, and temperature is 1600 ℃, and speed is 2 tons/3 minutes, and result and steel or slag contact interface are clear, do not have any adhesion; The mouth of a river demonstrates strong anti-permeability, and contact interface is consistent with interior substructure, and this mainly is because of relative density improves, unlike oxide based refractory materials generation slag phenomenon of osmosis.

Embodiment 2 is that any one makes the monoblock type mouth of a river in the 1-5 component with being numbered among the above-mentioned table 1-3, tests in XXX Iron And Steel Company, and temperature is 1519-1546 ℃, and reinforcing bar speed is 2.50m/min, has carried out 48min; And the mouth of a river of making carried out the 58min test, and the result is identical with embodiment 1.

Claims

1, a kind of middle water containing opening silicon nitride combined with silicon carbide refractory material is characterized in that concrete component (wt%) is: SiC 50-80; Si ₃N ₄10-30; Al ₂O ₃5-20; Maximum particle size is the 20-120 order.

2, by the described silicon nitride combined with silicon carbide refractory material of claim 1, it is characterized in that concrete component is (wt%): SiC 60; Si ₃N ₄30; Al ₂O ₃10; Maximum particle size is 20 orders.

3, by the described silicon nitride combined with silicon carbide refractory material of claim 1, it is characterized in that concrete component is (wt%) SiC 75; Si ₃N ₄15; Al ₂O ₃10; Maximum particle size is 20 orders.

4, by the described silicon nitride combined with silicon carbide refractory material of claim 1, it is characterized in that concrete component is (wt%) SiC 75; Si ₃N ₄20; Al ₂O ₃5; Maximum particle size is 80 orders.

5, by the carborundum refractory of the described silicon nitride bonded silicon of claim 1, it is characterized in that concrete component is (wt%) SiC 60; Si ₃N ₄30; Al ₂O ₃10, maximum particle size is 120 orders.

6, by the described silicon nitride combined with silicon carbide refractory material of claim 1, it is characterized in that concrete component is (wt%) SiC 75; Si ₃N ₄15; Al ₂O ₃10, maximum particle size is 120 orders.

7, can be made into the inserted mouth of a river or monoblock type middle water containing opening as the casting stainless steel base or draw the middle water containing opening of reinforcing bar by claim 1,2,3,4,5,6 described silicon nitride combined silicon carbide materials, any adhesion does not take place with steel or slag and anti-permeability strong