CN110204339A - A kind of metal self-bonding silicon carbide brick production technology - Google Patents
A kind of metal self-bonding silicon carbide brick production technology Download PDFInfo
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Abstract
The present invention relates to a kind of metals to be self-bonded silicon carbide brick production technology, belongs to metallurgy industry high-temperature refractory and Hightemperature Kiln Furniture production technical field.Technical solution is: raw material uses following components by weight percent: silicon carbide: 75-85%, metallic silicon power: 3-8%, metallic aluminium powder: 1-4%, alumina powder 3-10%, carbon: 1-3%, boron carbide: 0.5-2%, phenolic resin: 2-4%；Its production technology comprises the steps of: 1. mixing: above-mentioned raw materials are mixed into pug；2. molding: the pug being mixed into is pressed into adobe；3. drying: adobe is dried；4. firing: dried adobe is burnt into.The beneficial effects of the present invention are: raw material technical requirements needed for producing are low, firing temperature is low, and heat utilization rate is high, and low energy consumption, and production cost is low, has good inoxidizability and thermal shock resistance, low in the pollution of the environment.
Description
Technical field
The present invention relates to a kind of metals to be self-bonded silicon carbide brick production technology, belongs to metallurgy industry high-temperature refractory and height
Warm kiln furnitures production technical field.
Background technique
In high temperature industries such as metallurgy, ceramics, resistance to materials, require that product is burnt into and is smelted at high temperature, this is just needed
Want good refractory material as kiln furnitures and heat-barrier material.In many materials, silicon nitride combined silicon carbide brick has high temperature strong
Degree is high, and thermal expansion coefficient is small, has good thermal shock resistance, and high temperature resists compacted ability strong, corrosion-resistant, resistance to extremely cold very hot, anti-oxidant,
Long service life.Product is widely used in a variety of industries such as steel, non-ferrous metal, chemical building material.
The primary raw material of silicon nitride combined silicon carbide brick uses high-purity silicon carbide particle, powder and metallic silicon powder, uses
Calcium lignosulfonate aqueous solution adds appropriate plasticizer as bonding agent, and composition proportion is as follows:
The main technique of silicon nitride combined silicon carbide brick is as follows:
(1) it mixing: weighs respectively by formula, particulate material is poured into wheeled kneading machine and is stirred, after about 3 minutes, is slowly added to
After being kneaded about 3 minutes, powder is added in the calcium lignosulfonate aqueous solution of half weight, and the calcium lignosulfonate that remaining half is about added after five minutes is water-soluble
Liquid continues to be kneaded about 20 minutes, grind out, it is spare to be packed into truck.
(2) form: the pug that will be got ready is uniformly fitted into mold, by design substance precise using vibrating forming machine
Extrusion forming.
(3) dry: dry into dry kiln after examining qualified adobe to spontaneously dry 24 to 48 hours.
(4) Nitride firing: being started to warm up in nitrogen protection atmosphere from room temperature using electric furnace, 1380-1450 DEG C of firing 10
Hour.It needs to discharge fume in sintering process, vacuumize, electric furnace needs a straight-through nitrogen, keeps atmosphere and barotropic state, is burnt into work
Skill is as follows:
It is cooled to room temperature after firing, tests to adobe appearance and physical and chemical index, index is as follows:
Its production technology of silicon nitride combined silicon carbide brick has the following problems:
(1) in silicon nitride combined silicon carbide brick, SiC content >=98% in silicon carbide is generally required, Si content >=98% in metallic silicon；
(2) electric furnace firing power consumption is high, nitridation high-temperature sintering equipment is costly, equipment maintenance cost is high；(3) technology utilization
Nitrogen generates silicon nitride bonded silicon phase with reacting for metallic silicon under high temperature, and therefore, nitrogen oxides (NOx, VOCs) discharge is high, peculiar smell
Greatly, the problems such as environmental issue is more prominent；
(4) if nitrogen gas purity not enough or furnace sealing is not tight, green strength after burning is low, Yi Fenhua.
Summary of the invention
The object of the present invention is to provide a kind of metals to be self-bonded silicon carbide brick production technology, raw material technical requirements needed for producing
Low, low energy consumption, and production cost is low, has good inoxidizability and thermal shock resistance, reduces environmental pollution, and solves in background technique
There are the problem of.
The technical scheme is that
A kind of metal self-bonding silicon carbide brick production technology, raw material use following components by weight percent: silicon carbide: 75-85%, metallic silicon
Powder: 3-8%, metallic aluminium powder: 1-4%, alumina powder 3-10%, carbon: 1-3%, boron carbide: 0.5-2%, phenolic resin: 2-4%,
Production technology comprises the steps of:
1. mixing: above-mentioned raw materials are mixed into pug；
2. molding: the pug being mixed into is pressed into adobe；
3. drying: adobe is dried；
4. firing: dried adobe is burnt into.
4. it is that adobe is packed into tunnel oven to carry out that the step is burnt into, and calcining system is as follows:
Room temperature ~ 1150 DEG C continue firing time 48 ~ 60 hours；1150 ~ 1350 DEG C continue firing time 6-10 hours；1350~400
DEG C continue firing time 72 hours；Then kiln discharge naturally cools to room temperature.
1. mixing is first to be uniformly mixed silicon carbide under dry state with metallic aluminium powder to the step, then adds other originals
Material is kneaded.
3. drying is that adobe is dried in dry kiln to the step, and drying system is as follows:
Loading of kiln after adobe is dried 8 ~ 12 hours at normal temperature；Room temperature ~ 80 DEG C are 4 ~ 6 hours dry；80 ~ 120 DEG C drying 8 ~ 10 hours；
120 ~ 180 DEG C drying 8 ~ 10 hours；180 ~ 220 DEG C of kiln discharges after drying 8 ~ 10 hours.
The beneficial effects of the present invention are:
(1) compared with the background art, raw material technical requirements needed for the present invention produces are low.Silicon nitride combined silicon carbide brick requires carbonization
SiC content >=98% in silicon, Si content >=98% in metallic silicon, and metal self-bonding silicon carbide brick requires SiC content in silicon carbide
>=97%, Si content >=97% in metallic silicon has saved cost of material；
(2) present invention is mixed using silicon-carbide particle with the dry state of metallic aluminium powder, and metallic aluminium powder is made uniformly to overlay on silicon-carbide particle
Surface can make aluminium generate radial non-oxidized substance in particle surface, increase the holding power to particle, improve high at high temperature
Warm mechanical property；And aluminium powder can slow down thermal stress with the thermal expansion of absorbing particles, improve thermal shock resistance；Improve aluminium powder point
The dispersivity of cloth is conducive to the homogenization of material structure and performance, improves the stability used；
(3) present invention addition metallic aluminium powder, can be improved the medium and high temperature strength of silicon carbide brick；
(4) firing temperature of the present invention is low, heat utilization rate is high.It is 1150-1350 DEG C that metal, which is self-bonded silicon carbide brick firing temperature,
And silicon nitride combined silicon carbide brick firing temperature is generally required at 1380 DEG C or more；Metal self-bonding silicon carbide brick can use natural gas
Tunnel oven firing, heat utilization rate are high；And it is not required to nitrogen atmosphere firing, NOx, VOCs discharge low, free from extraneous odour, energy-saving green
Colour circle is protected.
Specific embodiment
Below by way of example, the invention will be further described.
A kind of metal self-bonding silicon carbide brick production technology, raw material use following components by weight percent: silicon carbide: 75-85%, gold
Belong to silicon powder: 3-8%, metallic aluminium powder: 1-4%, alumina powder 3-10%, carbon: 1-3%, boron carbide: 0.5-2%, phenolic resin: 2-
4%, production technology comprises the steps of:
1. mixing: above-mentioned raw materials are mixed into pug；
2. molding: the pug being mixed into is pressed into adobe；
3. drying: adobe is dried；
4. firing: dried adobe is burnt into.
Specific embodiment:
Each raw material weight percentage see the table below 1 in embodiment:
Raw material components by weight percent in 1 embodiment of table
The specific process is as follows:
(1) by above-mentioned raw materials formula, weighing stock is stand-by respectively；
(2) silicon-carbide particle according to table 1 by granularity greater than 0.045mm and metallic aluminium powder premix under dry state, make metallic aluminium powder
Uniformly overlay on silicon-carbide particle surface；Then the silicon carbide of phenolic resin, granularity less than or equal to 0.045mm and other originals is added
Material is kneaded, and control pug grinds interior temperature and goes out to grind at 50-60 DEG C；By the mixed appropriate ageing mixture spreading for cooling of pug；
(3) after pug ageing mixture, by design substance precise, be uniformly fitted into mold, using friction press or it is hydraulic at
The extrusion forming of type machine；
(4) examining qualified adobe to enter, dry kiln is dry, and drying system is as follows:
(5) dried adobe is packed into kiln car and is sealed with carbon granules, is burnt into Natural Gas Fueled Tunnel Kiln, firing system
It spends as follows:
(6) it after Temperature fall to room temperature, tests to its presentation quality and physical and chemical index, as a result such as table 2:
2 metal of table is self-bonded silicon carbide brick physical and chemical index
Claims (4)
1. a kind of metal is self-bonded silicon carbide brick production technology, it is characterised in that: raw material uses following components by weight percent: silicon carbide:
75-85%, metallic silicon power: 3-8%, metallic aluminium powder: 1-4%, alumina powder 3-10%, carbon: 1-3%, boron carbide: 0.5-2%, phenolic aldehyde
Resin: 2-4%, production technology comprise the steps of:
1. mixing: above-mentioned raw materials are mixed into pug；
2. molding: the pug being mixed into is pressed into adobe；
3. drying: adobe is dried；
4. firing: dried adobe is burnt into.
2. a kind of metal according to claim 1 is self-bonded silicon carbide brick production technology, it is characterised in that: the step is 4.
Firing is that adobe is packed into tunnel oven to carry out, and calcining system is as follows:
Room temperature ~ 1150 DEG C continue firing time 48 ~ 60 hours；1150 ~ 1350 DEG C continue firing time 6-10 hours；1350~400
DEG C continue firing time 72 hours；Then kiln discharge naturally cools to room temperature.
3. a kind of metal according to claim 1 or 2 is self-bonded silicon carbide brick production technology, it is characterised in that: the step
Suddenly 1. mixing is first to be uniformly mixed silicon carbide under dry state with metallic aluminium powder, then adds other raw materials and is kneaded.
4. a kind of metal according to claim 1 or 2 is self-bonded silicon carbide brick production technology, it is characterised in that: the step
Suddenly 3. drying is that adobe is dried in dry kiln, and drying system is as follows:
Loading of kiln after adobe is dried 8 ~ 12 hours at normal temperature；Room temperature ~ 80 DEG C are 4 ~ 6 hours dry；80 ~ 120 DEG C drying 8 ~ 10 hours；
120 ~ 180 DEG C drying 8 ~ 10 hours；180 ~ 220 DEG C of kiln discharges after drying 8 ~ 10 hours.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112341201A (en) * | 2020-11-10 | 2021-02-09 | 宜兴市丁山耐火器材有限公司 | Self-bonding silicon carbide refractory material and preparation method thereof |
| CN116477954A (en) * | 2023-05-08 | 2023-07-25 | 中钢集团洛阳耐火材料研究院有限公司 | High-temperature low-elastic-modulus high-strength silicon carbide refractory material and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112341201A (en) * | 2020-11-10 | 2021-02-09 | 宜兴市丁山耐火器材有限公司 | Self-bonding silicon carbide refractory material and preparation method thereof |
| CN116477954A (en) * | 2023-05-08 | 2023-07-25 | 中钢集团洛阳耐火材料研究院有限公司 | High-temperature low-elastic-modulus high-strength silicon carbide refractory material and preparation method thereof |
| CN116477954B (en) * | 2023-05-08 | 2024-03-15 | 中钢集团洛阳耐火材料研究院有限公司 | High-temperature low-elastic-modulus high-strength silicon carbide refractory material and preparation method thereof |
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Application publication date: 20190906 |