CN104341125A - Heat insulating board for casting die and preparation process thereof - Google Patents
Heat insulating board for casting die and preparation process thereof Download PDFInfo
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- CN104341125A CN104341125A CN201410559832.7A CN201410559832A CN104341125A CN 104341125 A CN104341125 A CN 104341125A CN 201410559832 A CN201410559832 A CN 201410559832A CN 104341125 A CN104341125 A CN 104341125A
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- insulating shield
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Abstract
The invention provides a heat insulating board for a casting die and a preparation process thereof. The heat insulating board for the casting die is prepared from the raw materials in parts by weight: 15-25 parts of high-temperature ceramic fibers, 50-70 parts of quartz sand, 4-6 parts of clay, 4-6 parts of starch binder and 5-10 parts of ceramic hollow spheres. The heat insulating board for the casting die, provided by the invention, has the advantages that the burning point of organic matters in the heat insulating board is increased, the content of substances with low melting points is reduced, and the volume stability of the heat insulating board in a high-temperature state is guaranteed.
Description
Technical field
The present invention relates to heat-insulating shield field, particularly relate to a kind of heat-insulating shield and preparation technology thereof of environment-friendly type.
Background technology
Heat-insulating shield is that a kind of thermal capacity is extremely low, insulation effect good, with SiO
2for the fire proofed wood section of base, its advantage is: plate is thin, body is light, is convenient to install.The heat-insulating shield of tradition ingot casting is for raw material with quartz sand, mineral wool fibre, cardboard, clay, resin, flyash etc., the unit weight of its heat-insulating shield obtained is about 0.5 ~ 1.0g/cm3, coefficient is 0.1 ~ 0.4W/ (m DEG C), is incubated, reduces the demand of crop rate when can meet the cast of most of steel grade.But produce when requiring strict steel grade to feeding, this heat-insulating shield still can not meet the demands, and is embodied in heat insulation effect bad, cause that ingot head is loose and shrinkage cavity is comparatively serious, make crop rate higher.
The key areas such as metallurgy, shipbuilding, defence and military, electric power, nuclear energy, Highrise buildings, petrochemical complex are widely used in due to steel ingot product, because of the singularity of its Application Areas, also extremely strict to the requirement of its product quality and performances, what have also requires to have higher Z-direction performance and flaw detection qualification rate.But once the insulation of box-hat portion is bad, the defects such as loose or shrinkage cavity will be produced at steel ingot body, and then affect the product quality and performances after steel ingot rolling.Therefore, develop a kind of low thermal conductivity, the die casting heat-insulating shield of high insulating effect is particularly important.
Summary of the invention
Based on above-mentioned deficiency, the invention provides a kind of new mold heat-insulating shield and preparation technology thereof.
The present invention adopts following technical scheme:
A kind of mold heat-insulating shield, the raw materials by weight portion ratio that it adopts comprises following component:
High-temperature ceramic fibre 15 ~ 25, quartz sand 50 ~ 70,
Clay 4 ~ 6, starch adesive 4 ~ 6, ceramic hollow ball 5 ~ 10.
Wherein, described high-temperature ceramic fibre is refractory fiber cotton.
Wherein, its raw materials by weight portion ratio adopted comprises following component:
High-temperature ceramic fibre 20, quartz sand 60,
Clay 5, starch adesive 5, ceramic hollow ball 8.
Wherein, described mold heat-insulating shield also comprises paper fiber, and the ratio of weight and number of described paper fiber is 1 ~ 3.
Wherein, the ratio of weight and number of described paper fiber is 2.
Wherein, described paper fiber is newspaper fiber.
The preparation technology of above-mentioned mold heat-insulating shield, comprises the steps:
S100: take raw material by above-mentioned ratio of weight and number, mixes each raw material and stirs and obtain slurry;
S200: described slurry is put into template, and carry out vacuum filtration forming processes and obtain heat-insulating shield slab;
S300: dry, drying and processing is carried out to described heat-insulating shield slab.
Wherein, the temperature of described drying and processing is 100 ~ 150 DEG C.
The invention has the beneficial effects as follows:
(1) mold heat-insulating shield of the present invention improves point of ignition organic in heat-insulating shield, reduces the content of eutectic melting point material, ensure that the volume stability under the heat-insulating shield condition of high temperature.
(2), in the present invention, have employed ceramic hollow ball under the prerequisite improving refractoriness, reduce further thermal conductivity.
(3) raw material of formation low-melting-point material is reduced in mold heat-insulating shield of the present invention as clay and resistance to cotton, avoid these low melting point raw materials more than 800 DEG C during high temperature or burning or fusing, so just cause volumetric shrinkage and the cracking of heat-insulating shield, and then cause thermal conduction to strengthen, thermal conductivity is increased.
(4) heat-insulating shield toughness of the present invention is strong, not easily Inward deflection occurs, can reduce the hanger crack of steel ingot.
Embodiment
The present invention is described in detail below in conjunction with embodiment.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Existing existing traditional lightweight heat-insulating shield is very excellent about 350 DEG C heat-insulating properties, but thermal conduction enlarges markedly when continuing to be warming up to more than 800 DEG C, reason is: containing organic and low melting point in conventional insulation sheet, they are more than 800 DEG C during high temperature or burning or fusing, so just cause volumetric shrinkage and the cracking of heat-insulating shield, and then cause thermal conduction to strengthen, thermal conductivity is increased.
Technical thought of the present invention is the content improving point of ignition organic in heat-insulating shield, reduce eutectic melting point material, to keep the volume stability under the heat-insulating shield condition of high temperature.
Specifically, the invention provides a kind of mold heat-insulating shield, the raw materials by weight portion ratio that it adopts comprises following component:
High-temperature ceramic fibre 15 ~ 25, quartz sand 50 ~ 70,
Clay 4 ~ 6, starch adesive 4 ~ 6, ceramic hollow ball 5 ~ 10.
Wherein starch adesive is Zulkovsky starch or amylose starch.
What adopt in traditional heat-insulating shield is paper fiber, the fusing point of paper fiber is low, and impurity is many, have employed high-temperature ceramic fibre and replace paper fiber in the present embodiment, decrease the content of eutectic melting point material in heat-insulating shield, maintain heat-insulating shield volume stability at high operating temperatures.The ceramic bonding of the high-temperature ceramic fibre used is with mullite (3Al
2o
32SiO
2, 71.8%) and be representative.The present embodiment additionally uses ceramic hollow ball, it not only can improve the refractoriness of heat-insulating shield, and the thermal conductivity of heat-insulating shield can be reduced further, still keep good insulation capacity under making the high temperature of the heat-insulating shield in the present embodiment more than 800 DEG C with high-temperature ceramic fibre acting in conjunction.Compared with existing heat-insulating shield, decrease the content of the raw material of low melting point in the present embodiment, the raw material of described low melting point comprises clay and resistance to cotton.Traditional heat-insulating shield corrodes easy Inward deflection for a long time through molten steel, thus create steel ingot hanger crack, and the heat-insulating shield obtained in the present embodiment toughness under the synergy of above-mentioned each component strengthens, not easily produce Inward deflection, therefore can reduce the hanger crack of steel ingot, improve ingot quality.Conventional insulation sheet adopts resol to make bonding agent, in carbonization process, discharge the objectionable impuritiess such as phenols.The starch adesive adopted in the present invention is natural starch based modify cement, friendly with site operation personnel to environment; Bonding strength is high simultaneously, decreases the loss in construction process.
Further, also can add a small amount of paper fiber in above-mentioned raw materials, paper fiber is organic fibre, adds the intensity that paper fiber can increase heat-insulating shield green compact in the feed, high-temperature ceramic fibre and paper fiber jointly use and can ensure bond effect, avoid heat-insulating shield green compact to break.
Preferably, described high-temperature ceramic fibre is refractory fiber cotton.Preferably, the refractory fiber cotton in the present embodiment is high aluminium profiles refractory ceramic fibre, and heat resisting temperature is greater than 1200 DEG C, and Fibre diameter is generally 3 ~ 5 microns.
Preferably, its raw materials by weight portion ratio adopted comprises following component:
High-temperature ceramic fibre 20, quartz sand 60,
Clay 5, starch adesive 5, ceramic hollow ball 8.
Preferably, the ratio of weight and number of described paper fiber is 1 ~ 3.
More excellent, the ratio of weight and number of described paper fiber is 2.
More excellent, described paper fiber is newspaper fiber.The present embodiment replaces former useless fiber board fiber with the better newspaper fiber of toughness, and good toughness, when ensureing shaping, corner angle are complete, assembled zero-clearance.
Accordingly, the present invention also provides a kind of preparation technology of mold heat-insulating shield, comprises the steps:
S100: take raw material by above-mentioned ratio of weight and number, mixes each raw material and stirs and obtain slurry; Churning time is 10 ~ 30 minutes;
S200: described slurry is put into template, and carry out vacuum filtration forming processes and obtain heat-insulating shield slab; The concrete operation step of this step is quantitatively added in template by slurry, suction strainer after flattening, and then slurry is filled up mould, stops suction strainer, turnover mould, hold the heat-insulating shield slab in mould, can obtain heat-insulating shield slab with supporting plate after water exhaustion;
S300: dry, drying and processing is carried out to described heat-insulating shield slab.Bake out temperature is 100 ~ 150 DEG C.
Embodiment one
A kind of mold heat-insulating shield, the raw materials by weight portion ratio that it adopts comprises following component:
High-temperature ceramic fibre 15, quartz sand 50, clay 4, starch adesive 6, ceramic hollow ball 10.
Its preparation technology comprises the steps:
S100: take raw material by above-mentioned ratio of weight and number, mixes each raw material and stirs and obtain slurry; Churning time is 10 minutes;
S200: just slurry quantitatively adds in template, suction strainer after flattening, and then slurry is filled up mould, after water exhaustion, stop suction strainer, turnover mould, hold the heat-insulating shield slab in mould with supporting plate, heat-insulating shield slab can be obtained;
S300: dry, drying and processing is carried out to described heat-insulating shield slab.Bake out temperature is 100 ~ 150 DEG C.
Embodiment two
A kind of mold heat-insulating shield, the raw materials by weight portion ratio that it adopts comprises following component:
High-temperature ceramic fibre 25, quartz sand 70, clay 6, starch adesive 4, ceramic hollow ball 5.
Its preparation technology comprises the steps:
S100: take raw material by above-mentioned ratio of weight and number, mixes each raw material and stirs and obtain slurry; Churning time is 10 minutes;
S200: just slurry quantitatively adds in template, suction strainer after flattening, and then slurry is filled up mould, after water exhaustion, stop suction strainer, turnover mould, hold the heat-insulating shield slab in mould with supporting plate, heat-insulating shield slab can be obtained;
S300: dry, drying and processing is carried out to described heat-insulating shield slab.Bake out temperature is 100 DEG C.
Embodiment three
A kind of mold heat-insulating shield, the raw materials by weight portion ratio that it adopts comprises following component:
High-temperature ceramic fibre 15, quartz sand 50, clay 4, starch adesive 6, ceramic hollow ball 10, paper fiber 1.
Its preparation technology is with embodiment one.
Embodiment four
A kind of mold heat-insulating shield, the raw materials by weight portion ratio that it adopts comprises following component:
High-temperature ceramic fibre 25, quartz sand 50, clay 6, starch adesive 6, ceramic hollow ball 10, paper fiber 3.
Its preparation technology is with embodiment one.
Embodiment five
A kind of mold heat-insulating shield, the raw materials by weight portion ratio that it adopts comprises following component:
High-temperature ceramic fibre 20, quartz sand 60, clay 5, starch adesive 5, ceramic hollow ball 8, paper fiber 2.
Its preparation technology is with embodiment one.
The simultaneous test of the heat-insulating shield that the present invention obtains and existing heat-insulating shield is as follows:
One, high-temperature heat treatment, under the high temperature of 1400 DEG C and 1200 DEG C put into respectively by heat-insulating shield the present invention obtained and existing heat-insulating shield, measures its changes in weight after insulation 0.5h or 1h.Specifically in table 1:
Table 1
No matter can be found out by table 1, be at 1400 DEG C or 1200 DEG C, the rate of weight loss of the heat-insulating shield that the rate of weight loss of existing heat-insulating shield all obtains higher than the present invention.
Two, high-temperature heat treatment, under the high temperature of 1400 DEG C and 1200 DEG C put into respectively by heat-insulating shield the present invention obtained and existing heat-insulating shield, measures its dimensional change after insulation 0.5h or 1h.Specifically in table 2:
Table 2
As can be seen from Table 2: no matter be thickness or length, no matter be also at 1400 DEG C or at 1200 DEG C, the contraction of the heat-insulating shield that the contraction of existing heat-insulating shield all obtains than the present invention is large.
Three, discharge flat band method is adopted to measure the thermal conductivity of existing heat-insulating shield and heat-insulating shield of the present invention.The measuring result of existing heat-insulating shield is as shown in table 3, and the measuring result of heat-insulating shield of the present invention is as shown in table 4.
The thermal conductivity detected result of the existing heat-insulating shield of table 3
The thermal conductivity detected result of heat-insulating shield prepared by table 4 the present invention
Table 3 and table 4 show, below 600 DEG C, the thermal conductivity of existing heat-insulating shield is 0.1 ~ 0.139W/m.k, and in this temperature range, the heat-insulating property of existing heat-insulating shield is better than heat-insulating shield of the present invention; Time more than 800 DEG C, the thermal conductivity of existing heat-insulating shield is 0.3W/m.k, and the thermal conductivity of heat-insulating shield of the present invention is 0.2W/m.k, and in this temperature range, the heat-insulating property of heat-insulating shield of the present invention is better than existing heat-insulating shield; And in practical application, the working temperature of heat-insulating shield will more than 800 DEG C, therefore, heat-insulating shield of the present invention is more suitable for practical application.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. a mold heat-insulating shield, is characterized in that, the raw materials by weight portion ratio that it adopts comprises following component:
High-temperature ceramic fibre 15 ~ 25, quartz sand 50 ~ 70,
Clay 4 ~ 6, starch adesive 4 ~ 6, ceramic hollow ball 5 ~ 10.
2. mold heat-insulating shield according to claim 1, is characterized in that, described high-temperature ceramic fibre is refractory fiber cotton.
3. mold heat-insulating shield according to claim 1, is characterized in that, the raw materials by weight portion ratio that it adopts comprises following component:
High-temperature ceramic fibre 20, quartz sand 60,
Clay 5, starch adesive 5, ceramic hollow ball 8.
4. mold heat-insulating shield according to claim 1, is characterized in that, described mold heat-insulating shield also comprises paper fiber, and the ratio of weight and number of described paper fiber is 1 ~ 3.
5. mold heat-insulating shield according to claim 4, is characterized in that, the ratio of weight and number of described paper fiber is 2.
6. mold heat-insulating shield according to claim 4, is characterized in that, described paper fiber is newspaper fiber.
7. a preparation technology for the mold heat-insulating shield described in claim 1 to 6 any one, is characterized in that, comprise the steps:
S100: take raw material by above-mentioned ratio of weight and number, mixes each raw material and stirs and obtain slurry;
S200: described slurry is put into template, and carry out vacuum filtration forming processes and obtain heat-insulating shield slab;
S300: dry, drying and processing is carried out to described heat-insulating shield slab.
8. preparation technology according to claim 7, is characterized in that, the temperature of described drying and processing is 100 ~ 150 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410559832.7A CN104341125A (en) | 2014-10-20 | 2014-10-20 | Heat insulating board for casting die and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410559832.7A CN104341125A (en) | 2014-10-20 | 2014-10-20 | Heat insulating board for casting die and preparation process thereof |
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| Publication Number | Publication Date |
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| CN104341125A true CN104341125A (en) | 2015-02-11 |
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ID=52497660
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410559832.7A Pending CN104341125A (en) | 2014-10-20 | 2014-10-20 | Heat insulating board for casting die and preparation process thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112374818A (en) * | 2020-11-27 | 2021-02-19 | 山东鲁阳节能材料股份有限公司 | High-density ceramic fiber board with use temperature of more than 1100 ℃ and preparation method thereof |
| CN113896548A (en) * | 2021-10-19 | 2022-01-07 | 太原钢城企业集团化工有限公司 | Heat insulation plate and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101486543A (en) * | 2009-01-07 | 2009-07-22 | 浙江红鹰集团股份有限公司 | Environment friendly type heat-insulating plate formula |
| CN104086116A (en) * | 2014-07-11 | 2014-10-08 | 平顶山新型耐材股份有限公司 | Nano microporous heat insulation board and preparation method thereof |
-
2014
- 2014-10-20 CN CN201410559832.7A patent/CN104341125A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101486543A (en) * | 2009-01-07 | 2009-07-22 | 浙江红鹰集团股份有限公司 | Environment friendly type heat-insulating plate formula |
| CN104086116A (en) * | 2014-07-11 | 2014-10-08 | 平顶山新型耐材股份有限公司 | Nano microporous heat insulation board and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 耿恕等: "《国内外轻质绝热板的研制与应用》", 《特殊钢》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112374818A (en) * | 2020-11-27 | 2021-02-19 | 山东鲁阳节能材料股份有限公司 | High-density ceramic fiber board with use temperature of more than 1100 ℃ and preparation method thereof |
| CN113896548A (en) * | 2021-10-19 | 2022-01-07 | 太原钢城企业集团化工有限公司 | Heat insulation plate and preparation method thereof |
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Application publication date: 20150211 |