CN102408242A - Composite ceramic cushion block for hot rolling walking beam reheating furnace and preparation method thereof - Google Patents
Composite ceramic cushion block for hot rolling walking beam reheating furnace and preparation method thereof Download PDFInfo
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- CN102408242A CN102408242A CN201110240435XA CN201110240435A CN102408242A CN 102408242 A CN102408242 A CN 102408242A CN 201110240435X A CN201110240435X A CN 201110240435XA CN 201110240435 A CN201110240435 A CN 201110240435A CN 102408242 A CN102408242 A CN 102408242A
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Abstract
The invention relates to a composite ceramic cushion block for hot rolling walking beam reheating furnace and a preparation method thereof. The preparation method comprises the following steps of: taking 25-75% of Si powder and 75-25% of SiC powder as raw materials, and taking 3-8% of sintering assistant and 3-5% of bonder in percentage by weight as additives; mixing the raw materials with the sintering assistant, drying, uniformly mixing the dried mixture powder body with the bonder, forming and isostatically pressing to obtain bisques; insulating the bisques for 1-30h in nitrogen atmosphere at 1280-1410 degrees centigrade, continuously heating to 1450-1700 degrees centigrade in the nitrogen atmosphere, and insulating for 3-8h to obtain nitrided sintering blanks; and immersing the nitrided sintering blanks with silicon under the conditions of temperature of 1700-1850 degrees centigrade and vacuum degree of below 100Pa for 2-20h, and machining the prepared blanks. The invention has simple technology and low cost, and the product has the characteristics of high temperature resistance, good creep resistance, small heat conduction coefficient, good thermal shock resistance, wear resistance and high high-temperature strength.
Description
Technical field
The invention belongs to the composite ceramics technical field, be specifically related to a kind of hot rolling walking beam furnace with composite ceramics cushion block and preparation method thereof.
Background technology
At present; Cushion block in the metallurgical industry hot rolling mill walking beam furnace on the water-cooled beam adopts heat-resisting alloy steel to make; Birth defects such as thermal conductivity is big because high temperature steel exists, high temperature creep and oxidation damage; Be prone to cause be heated steel billet and " wandering off " occur, produce " water-cooled scar " (black seal) with the cushion block contact site and influence problem such as mill bar quality, become " bottleneck " problem of hi-tech steel steel rolling productions such as restriction latten; Thermoplasticity and ductility that the temperature of " water-cooled scar " simultaneously (" black seal ") is low, reduced steel billet make steel rolling crack occur easily and produce " waste wood ", especially produce high name oriented silicon steel, and for ultrathin sheet material even can't be rolling.
Be heated " water-cooled scar " (black seal) problem of steel billet and the generation of cushion block contact site for solution; Present stage adopts usually and improves Heating temperature and the way that prolongs heat-up time; To guarantee that steel billet reaches suitable thermoplasticity and ductility; This method exists obviously that energy consumption is high, steel billet ablation amount big, production rate reaches inefficient problem slowly, and the high temperature steel cushion block can damage by " flattenings " because of high temperature creep, cause the ordinary production that is heated steel billet appearance " wandering off " and then influences process furnace.Develop the steel alloy cushion block of new ceramics cushion block to replace using at present high temperature resistant and that creep-resistant property is good, thermal conductivity is little, intensity is big as early as possible, effectively address the above problem, become one of the most urgent task of steel rolling industry.
Summary of the invention
The present invention is intended to overcome the defective of prior art: purpose provides a kind of technology is simple, cost the is low hot rolling walking beam furnace preparation method with the composite ceramics cushion block; Composite ceramics cushion block with the preparation of this method is high temperature resistant, creep-resistant property good, thermal conductivity is little, good thermal shock, wear-resistant and hot strength is high, can solve " water-cooled scar " problem that is heated steel billet and cushion block contact site effectively.
For realizing above-mentioned purpose, the present invention adopts following technological step:
(1) batching: with the Si powder of 25～75wt% and the SiC powder of 75～25wt% is raw material, is admixture with the sintering aid of above-mentioned raw materials 3～8wt% and the wedding agent of above-mentioned raw materials 3～5wt%;
Wherein: sintering aid is Y
2O
3, or be Y
2O
3And Al
2O
3Mixture; Wedding agent is resol or is polyoxyethylene glycol;
(2) batch mixing: is that the wet mixing medium mixes with the raw material in the step (1) and the sintering aid in the admixture with dry mixed or with the absolute ethyl alcohol by separately percentage composition, carries out drying after mixing, and makes dried mixed powder;
(3) moulding: the wedding agent in the admixture in the step (1) is mixed by its percentage composition and dried mixed powder, carry out dry-pressing formed; Mixture with moulding waits static pressure to handle again, makes biscuit;
(4) sintering: biscuit is incubated 1～30h at nitrogen atmosphere with under 1280～1410 ℃ of conditions earlier, under nitrogen atmosphere, continues to be warmed up to 1450 ℃～1700 ℃ again, insulation 3～8h makes nitridation sintered base;
(5) oozing stain silicon handles: with nitridation sintered base temperature be 1700～1850 ℃ with the condition of vacuum tightness less than 100Pa under ooze stain silicon and handle, the treatment time is 2～20 hours, makes blank;
(6) blank is carried out mechanical process, make the hot rolling walking beam furnace and use the composite ceramics cushion block.
In technique scheme: the purity>=95wt% of Si powder, granularity is less than 0.1mm; Purity>=the 90wt% of SiC powder, granularity is less than 5mm; Y
2O
3Purity>=95wt%, Al
2O
3Purity>=95wt%; Y
2O
3And Al
2O
3Granularity less than 0.005mm; Dry-pressing formed pressure is 5～20MPa, and the pressure that waits static pressure to handle is 50～400MPa.
The present invention compared with prior art has following major advantage:
This preparing method's technology is simple, cost is low, and prepared high-temperature vacuum oozes the Si that stain silicon is handled
3N
4Characteristics such as that-SiC composite ceramics cushion block has is high temperature resistant, creep-resistant property good, thermal conductivity is little, good thermal shock, wear-resistant and hot strength height; Can replace Co40 or Co60 heat-resisting alloy steel and make water-cooling beam of heating furnace pottery cushion block; The requirement that hot rolling is produced can be satisfied, " water-cooled scar " (black seal) problem that is heated steel billet and cushion block contact site can be solved simultaneously effectively.
Embodiment
For avoiding repetition, the technical parameter unification that this embodiment is related earlier is described below: the purity>=95wt% of Si powder, and granularity is less than 0.1mm; Purity>=the 90wt% of SiC powder, granularity is less than 5mm; Y
2O
3Purity>=95wt%, Al
2O
3Purity>=95wt%; Y
2O
3And Al
2O
3Granularity less than 0.005mm; Dry-pressing formed pressure is 5～20MPa, and the pressure that waits static pressure to handle is 50～400MPa.
In order to understand the present invention better, below in conjunction with embodiment the present invention is further described, but content of the present invention not only is confined to following embodiment.
Embodiment 1
A kind of hot rolling walking beam furnace is with composite ceramics cushion block and preparation method thereof.Its preparation process is following:
(1) batching: with the Si powder of 25～37wt% and the SiC powder of 63～75wt% is raw material, with the Y of above-mentioned raw materials 3～5wt%
2O
3With the polyoxyethylene glycol of above-mentioned raw materials 3～4wt% be admixture;
(2) batch mixing: with raw material and the Y in the step (1)
2O
3By separately percentage composition with the absolute ethyl alcohol for the wet mixing medium mixes, carry out drying after mixing, make dried mixed powder;
(3) moulding: the polyoxyethylene glycol in the step (1) is mixed by its percentage composition and dried mixed powder, carry out dry-pressing formed; Mixture with moulding waits static pressure to handle again, makes biscuit;
(4) sintering: biscuit is incubated 1～4h at nitrogen atmosphere with under 1350～1410 ℃ of conditions earlier, under nitrogen atmosphere, continues to be warmed up to 1450 ℃～1500 ℃ again, insulation 3～4h makes nitridation sintered base;
(5) oozing stain silicon handles: with nitridation sintered base temperature be 1750～1800 ℃ with the condition of vacuum tightness less than 10Pa under ooze stain silicon and handle, the treatment time is 15～20 hours, makes blank;
(6) blank is carried out mechanical process, make the hot rolling walking beam furnace and use the composite ceramics cushion block.
Embodiment 2
A kind of hot rolling walking beam furnace is with composite ceramics cushion block and preparation method thereof.Its preparation process is following:
(1) batching: with the Si powder of 37～45wt% and the SiC powder of 55～63wt% is raw material, with the Y of above-mentioned raw materials 3～5wt%
2O
3With the polyoxyethylene glycol of above-mentioned raw materials 3～4wt% be admixture;
(2) batch mixing: with raw material and the Y in the step (1)
2O
3By separately percentage composition with the absolute ethyl alcohol for the wet mixing medium mixes, carry out drying after mixing, make dried mixed powder;
(3) moulding: the polyoxyethylene glycol in the step (1) is mixed by its percentage composition and dried mixed powder, carry out dry-pressing formed; Mixture with moulding waits static pressure to handle again, makes biscuit;
(4) sintering: biscuit is incubated 10～15h at nitrogen atmosphere with under 1350～1410 ℃ of conditions earlier, under nitrogen atmosphere, continues to be warmed up to 1600 ℃～1650 ℃ again, insulation 3～4h makes nitridation sintered base;
(5) oozing stain silicon handles: it is to ooze stain silicon under the condition of 30～50Pa to handle with vacuum tightness that nitridation sintered base is 1800～1850 ℃ in temperature, and the treatment time is 10～15 hours, makes blank;
(6) blank is carried out mechanical process, make the hot rolling walking beam furnace and use the composite ceramics cushion block.
Embodiment 3
A kind of hot rolling walking beam furnace is with composite ceramics cushion block and preparation method thereof.Its preparation process is following:
(1) batching: with the Si powder of 45～55wt% and the SiC powder of 45～55wt% is raw material, is admixture with the sintering aid of above-mentioned raw materials 5～8wt% and the polyoxyethylene glycol of above-mentioned raw materials 3～4wt%; Sintering aid wherein is Y
2O
3And Al
2O
3Mixture, its mass ratio is 1: 1;
(2) batch mixing: with the raw material in the step (1) and the sintering aid in the admixture by separately percentage composition with the absolute ethyl alcohol for the wet mixing medium mixes, carry out drying after mixing, make dried mixed powder;
(3) moulding: the polyoxyethylene glycol in the step (1) is mixed by its percentage composition and dried mixed powder, carry out dry-pressing formed; Mixture with moulding waits static pressure to handle again, makes biscuit;
(4) sintering: biscuit is incubated 4～8h at nitrogen atmosphere with under 1350～1410 ℃ of conditions earlier, under nitrogen atmosphere, continues to be warmed up to 1600 ℃～1650 ℃ again, insulation 6～8h makes nitridation sintered base;
(5) oozing stain silicon handles: it is to ooze stain silicon under the condition of 50～100Pa to handle with vacuum tightness that nitridation sintered base is 1800～1850 ℃ in temperature, and the treatment time is 8～10 hours, makes blank;
(6) blank is carried out mechanical process, make the hot rolling walking beam furnace and use the composite ceramics cushion block.
Embodiment 4
A kind of hot rolling walking beam furnace is with composite ceramics cushion block and preparation method thereof.Its preparation process is following:
(1) batching: with the Si powder of 55～60wt% and the SiC powder of 40～45wt% is raw material, with the Y of above-mentioned raw materials 3～5wt%
2O
3With the resol of above-mentioned raw materials 4～5wt% be admixture;
(2) batch mixing: with raw material and the Y in the step (1)
2O
3By separately percentage composition with the absolute ethyl alcohol for the wet mixing medium mixes, carry out drying after mixing, make dried mixed powder;
(3) moulding: the resol in the step (1) is mixed by its percentage composition and dried mixed powder, carry out dry-pressing formed; Mixture with moulding waits static pressure to handle again, makes biscuit;
(4) sintering: biscuit is incubated 20～30h at nitrogen atmosphere with under 1350～1410 ℃ of conditions earlier, under nitrogen atmosphere, continues to be warmed up to 1600 ℃～1650 ℃ again, insulation 3～5h makes nitridation sintered base;
(5) oozing stain silicon handles: with nitridation sintered base temperature be 1700～1750 ℃ with the condition of vacuum tightness less than 10～30Pa under ooze stain silicon and handle, the treatment time is 15～20 hours, makes blank;
(6) blank is carried out mechanical process, make the hot rolling walking beam furnace and use the composite ceramics cushion block.
Embodiment 5
A kind of hot rolling walking beam furnace is with composite ceramics cushion block and preparation method thereof.Its preparation process is following:
(1) batching: with the Si powder of 25～37wt% and the SiC powder of 63～75wt% is raw material, with the Y of above-mentioned raw materials 5～8wt%
2O
3With the polyoxyethylene glycol of above-mentioned raw materials 3～4wt% be admixture;
(2) batch mixing: with raw material and the Y in the step (1)
2O
3By separately percentage composition with the absolute ethyl alcohol for the wet mixing medium mixes, carry out drying after mixing, make dried mixed powder;
(3) moulding: the polyoxyethylene glycol in the step (1) is mixed by its percentage composition and dried mixed powder, carry out dry-pressing formed; Mixture with moulding waits static pressure to handle again, makes biscuit;
(4) sintering: biscuit is incubated 10～15h at nitrogen atmosphere with under 1350～1410 ℃ of conditions earlier, under nitrogen atmosphere, continues to be warmed up to 1650 ℃～1700 ℃ again, insulation 5～8h makes nitridation sintered base;
(5) oozing stain silicon handles: with nitridation sintered base temperature be 1750～1800 ℃ with the condition of vacuum tightness less than 30～50Pa under ooze stain silicon and handle, the treatment time is 15～20 hours, makes blank;
(6) blank is carried out mechanical process, make the hot rolling walking beam furnace and use the composite ceramics cushion block.
Embodiment 6
A kind of hot rolling walking beam furnace is with composite ceramics cushion block and preparation method thereof.Its preparation process is following:
(1) batching: with the Si powder of 25～28wt% and the SiC powder of 72～75wt% is raw material, with the Y of above-mentioned raw materials 5～8wt%
2O
3The polyoxyethylene glycol of sintering aid and above-mentioned raw materials 3～4wt% is an admixture;
(2) batch mixing: with raw material and the Y in the step (1)
2O
3By separately percentage composition with the absolute ethyl alcohol for the wet mixing medium mixes, carry out drying after mixing, make dried mixed powder;
(3) moulding: the polyoxyethylene glycol in the step (1) is mixed by its percentage composition and dried mixed powder, carry out dry-pressing formed; Mixture with moulding waits static pressure to handle again, makes biscuit;
(4) sintering: biscuit is incubated 15～20h at nitrogen atmosphere with under 1350～1410 ℃ of conditions earlier, under nitrogen atmosphere, continues to be warmed up to 1500 ℃～1600 ℃ again, insulation 3～5h makes nitridation sintered base;
(5) oozing stain silicon handles: with nitridation sintered base temperature be 1700～1750 ℃ with the condition of vacuum tightness less than 10Pa under ooze stain silicon and handle, the treatment time is 5～8 hours, makes blank;
(6) blank is carried out mechanical process, make the hot rolling walking beam furnace and use the composite ceramics cushion block.
Embodiment 7
A kind of hot rolling walking beam furnace is with composite ceramics cushion block and preparation method thereof.Its preparation process is following:
(1) batching: with the Si powder of 60～75wt% and the SiC powder of 25～40wt% is raw material, is admixture with the sintering aid of above-mentioned raw materials 5～8wt% and the resol of above-mentioned raw materials 3～4wt%; Sintering aid wherein is Y
2O
3And Al
2O
3Mixture, mass ratio is 1: 1;
(2) batch mixing: the raw material in the step (1) and sintering aid are obtained mixed powder by separately percentage composition with dry mixed;
(3) moulding: the resol in the step (1) is mixed by its percentage composition and mixed powder, carry out dry-pressing formed; Mixture with moulding waits static pressure to handle again, makes biscuit;
(4) sintering: biscuit is incubated 5～10h at nitrogen atmosphere with under 1280～1350 ℃ of conditions earlier, under nitrogen atmosphere, continues to be warmed up to 1600 ℃～1550 ℃ again, insulation 5～8h makes nitridation sintered base;
(5) oozing stain silicon handles: is to ooze stain silicon under 1800～1850 ℃ of conditions with vacuum tightness 50～100Pa to handle with nitridation sintered base in temperature, and the treatment time is 2～5 hours, makes blank;
(6) blank is carried out mechanical process, make the hot rolling walking beam furnace and use the composite ceramics cushion block.
This embodiment technology is simple, cost is low, and prepared high-temperature vacuum oozes the Si that stain silicon is handled
3N
4Characteristics such as that-SiC composite ceramics cushion block has is high temperature resistant, creep-resistant property good, thermal conductivity is little, good thermal shock, wear-resistant and hot strength height; Can replace Co40 or Co60 heat-resisting alloy steel and make water-cooling beam of heating furnace pottery cushion block; The requirement that hot rolling is produced can be satisfied, " water-cooled scar " (black seal) problem that is heated steel billet and cushion block contact site can be solved simultaneously effectively.
Claims (6)
1. a hot rolling walking beam furnace is characterized in that adopting following steps with the preparation method of composite ceramics cushion block:
(1) batching: with the Si powder of 25～75wt% and the SiC powder of 75～25wt% is raw material, is admixture with the sintering aid of above-mentioned raw materials 3～8wt% and the wedding agent of above-mentioned raw materials 3～5wt%; Wherein: sintering aid is Y
2O
3, or be Y
2O
3And Al
2O
3Mixture; Wedding agent is resol or is polyoxyethylene glycol;
(2) batch mixing: is that the wet mixing medium mixes with the raw material in the step (1) and the sintering aid in the admixture with dry mixed or with the absolute ethyl alcohol by separately percentage composition, carries out drying after mixing, and makes dried mixed powder;
(3) moulding: the wedding agent in the admixture in the step (1) is mixed by its percentage composition and dried mixed powder, carry out dry-pressing formed; Mixture with moulding waits static pressure to handle again, makes biscuit;
(4) sintering: biscuit is incubated 1～30h at nitrogen atmosphere with under 1280～1410 ℃ of conditions earlier, under nitrogen atmosphere, continues to be warmed up to 1450 ℃～1700 ℃ again, insulation 3～8h makes nitridation sintered base;
(5) oozing stain silicon handles: with nitridation sintered base temperature be 1700～1850 ℃ with the condition of vacuum tightness less than 100Pa under ooze stain silicon and handle, the treatment time is 2～20 hours, makes blank;
(6) blank is carried out mechanical process, make the hot rolling walking beam furnace and use the composite ceramics cushion block.
2. hot rolling walking beam furnace according to claim 1 is characterized in that the purity >=95wt% of described Si powder with the preparation method of composite ceramics cushion block, and granularity is less than 0.1mm.
3. hot rolling walking beam furnace according to claim 1 is characterized in that the purity >=90wt% of described SiC powder with the preparation method of composite ceramics cushion block, and granularity is less than 5mm.
4. hot rolling walking beam furnace according to claim 1 is characterized in that described Y with the preparation method of composite ceramics cushion block
2O
3Purity>=95wt%, Al
2O
3Purity>=95wt%; Y
2O
3And Al
2O
3Granularity less than 0.005mm.
5. hot rolling walking beam furnace according to claim 1 is characterized in that with the preparation method of composite ceramics cushion block described dry-pressing formed pressure is 5～20MPa, and the pressure that waits static pressure to handle is 50～400MPa.
6. use the composite ceramics cushion block according to each described hot rolling walking beam furnace in the claim 1～5 with the prepared hot rolling walking beam furnace of the preparation method of composite ceramics cushion block.
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Cited By (10)
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| CN102765956A (en) * | 2012-08-17 | 2012-11-07 | 湖北红花高温材料有限公司 | Method for preparing zirconia cushion block used by walking-beam heating furnace |
| CN102795859A (en) * | 2012-08-17 | 2012-11-28 | 湖北红花高温材料有限公司 | SiC-Si3N4 high temperature ceramic furnace bottom plate for annular furnace and preparation method thereof |
| CN102898164A (en) * | 2012-11-07 | 2013-01-30 | 湖北红花高温材料有限公司 | SiSiC cushion block for walking beam furnace and preparation method thereof |
| CN102898165A (en) * | 2012-11-07 | 2013-01-30 | 宜昌科博耐火材料有限公司 | SiSiC high-temperature ceramic furnace bottom plate for annular furnace and preparation method for bottom plate |
| CN102910911A (en) * | 2012-09-20 | 2013-02-06 | 江西赛维Ldk太阳能高科技有限公司 | Test rod and preparation method thereof |
| CN103274712A (en) * | 2013-06-19 | 2013-09-04 | 济钢集团有限公司 | Cushion block for high temperature trolley type heating furnace and manufacturing technology thereof |
| CN105821202A (en) * | 2016-04-20 | 2016-08-03 | 湖北神雾热能技术有限公司 | Sliding block for stepping type heating furnace |
| CN108751998A (en) * | 2018-06-12 | 2018-11-06 | 汉江弘源襄阳碳化硅特种陶瓷有限责任公司 | A kind of silicon nitride combined silicon carbide ceramic filter and preparation method thereof |
| CN109608209A (en) * | 2018-12-21 | 2019-04-12 | 郑州安联凯实业有限公司 | A kind of production method of high thermal conductivity high abrasion refractory material |
| CN114477999A (en) * | 2022-03-28 | 2022-05-13 | 泰州市宏华冶金机械有限公司 | Preparation method of thermal shock resistant Al2TiO5-Ti3AlC2 ceramic |
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| CN102898164A (en) * | 2012-11-07 | 2013-01-30 | 湖北红花高温材料有限公司 | SiSiC cushion block for walking beam furnace and preparation method thereof |
| CN103274712A (en) * | 2013-06-19 | 2013-09-04 | 济钢集团有限公司 | Cushion block for high temperature trolley type heating furnace and manufacturing technology thereof |
| CN105821202A (en) * | 2016-04-20 | 2016-08-03 | 湖北神雾热能技术有限公司 | Sliding block for stepping type heating furnace |
| CN108751998A (en) * | 2018-06-12 | 2018-11-06 | 汉江弘源襄阳碳化硅特种陶瓷有限责任公司 | A kind of silicon nitride combined silicon carbide ceramic filter and preparation method thereof |
| CN108751998B (en) * | 2018-06-12 | 2021-05-11 | 汉江弘源襄阳碳化硅特种陶瓷有限责任公司 | Silicon nitride and silicon carbide combined ceramic filter and preparation method thereof |
| CN109608209A (en) * | 2018-12-21 | 2019-04-12 | 郑州安联凯实业有限公司 | A kind of production method of high thermal conductivity high abrasion refractory material |
| CN114477999A (en) * | 2022-03-28 | 2022-05-13 | 泰州市宏华冶金机械有限公司 | Preparation method of thermal shock resistant Al2TiO5-Ti3AlC2 ceramic |
| CN114477999B (en) * | 2022-03-28 | 2022-09-20 | 泰州市宏华冶金机械有限公司 | Preparation method of thermal shock resistant Al2TiO5-Ti3AlC2 ceramic |
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Application publication date: 20120411 |