CN103964876A - Raw material composition for graphite-silicon carbide riser tube and manufacturing process thereof - Google Patents
Raw material composition for graphite-silicon carbide riser tube and manufacturing process thereof Download PDFInfo
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- CN103964876A CN103964876A CN201410193124.6A CN201410193124A CN103964876A CN 103964876 A CN103964876 A CN 103964876A CN 201410193124 A CN201410193124 A CN 201410193124A CN 103964876 A CN103964876 A CN 103964876A
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- silicon carbide
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- riser tube
- riser pipe
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Abstract
The invention discloses a raw material composition for a graphite-silicon carbide riser tube. The raw material composition comprises the following raw materials in percentage by weight: 30% to 50% of flake graphite, 20% to 50% of silicon carbide, 4% to 10% of elemental silicon powder, 1% to 5% of boron carbide powder, and 10% to 14% of a bonding agent. The manufacturing process of the graphite-silicon carbide riser tube comprises the following steps: mixing raw materials evenly, and manufacturing qualified mud materials; loading the qualified mud materials into mould cavities, putting the mould cavities into an isostatic press cylinder, and pressing and shaping; demoulding, and processing blanks into desired sizes; preheating the blanks, and coating anti-oxidation glaze when the blanks are hot; burning the blanks in a naked mode so that the glaze is melted into glass glaze; detecting an air hole rate, and obtaining finished products if burned blanks are qualified. The process disclosed by the invention is simple, the prepared riser tube has high heat stability, the riser tube is ensured not to be burst, in addition, the riser tube has strong resistance to the erosiveness of molten aluminum, the corrosion problem of an iron riser tube is overcome, and the situation that iron is increased in molten aluminum is prevented; compared with the common riser tube which is combined with silicon nitride and silicon carbide, the production cost is low, and the raw material composition is suitable for large-scale industrial promotion.
Description
Technical field
The present invention relates to a kind of lift tube for low-voltage cast aluminum, be specifically related to a kind of feedstock composition and manufacturing process thereof of graphite-silicon carbide riser pipe.
Background technology
Riser pipe is one of key part on low die casting machine, directly affects quality and the production efficiency of cast aluminium product.Carry out low-pressure casting on air injection machine time, rely on pressure that aluminium liquid is risen in mould by riser pipe, the lower end of riser pipe is immersed in the aluminium liquid of crucible, and the temperature of aluminium liquid is up to more than 740 degree.Conventional riser pipe has two kinds at present, and one is all made by irony or stainless material, and long period of soaking can produce irony corrode in aluminium liquid, causes aluminium liquid to increase iron, have a strong impact on the quality of foundry goods, and irony corrode also can cause riser pipe damage; Another kind is silicon nitride combined silicon carbide matter, has thermostability high, and anti-aluminium liquid aggressiveness is good, does not increase the advantage of iron, but this kind of riser pipe complex manufacturing technology, production cost are high, expensive, is difficult to accept for general aluminium processing enterprise.
Summary of the invention
In order to address the above problem, the object of the invention is to, a kind of feedstock composition and manufacturing process thereof of graphite-silicon carbide riser pipe is provided, technique is simple, and production cost is low, and the aggressiveness of the anti-molten aluminum liquid of gained riser pipe is strong, long service life.
The feedstock composition of described graphite-silicon carbide riser pipe, comprises the raw material of following weight percent: crystalline flake graphite 30%-50%, silicon carbide 20%-50%, simple substance silica flour 4%-10%, boron carbide powder 1%-5%, bonding agent 10%-14%.The carbon content of described crystalline flake graphite is greater than 90%, and granularity is 50-100 order, and the purity of described silicon carbide is greater than 90%, and described bonding agent is resol.
The manufacturing process of described graphite-silicon carbide riser pipe, comprises the following steps:
(1) raw material of getting ready is put into mixing machine and mix, making fugitive constituent is the qualified pug of 1%-2%;
(2) qualified above-mentioned gained pug is packed in mold cavity;
(3) put into isostatic pressing machine cylinder, compression moulding under 100MPa-120MPa pressure;
(4) demoulding, becomes needed size by blank by machined into;
(5) blank is preheated to 180 DEG C-230 DEG C, applies while hot anti-oxidation glaze, obtain riser pipe work in-process;
(6) above-mentioned gained work in-process are put into the naked burning of Sweet natural gas kiln, firing temperature is 1000 DEG C-1200 DEG C, makes glaze be molten into glass glaze, must burn till product;
(7) detect the above-mentioned void content that burns till product, void content, for being not more than 12%, gets product.The size of void content can be controlled by adjusting fugitive constituent, and fugitive constituent suitably improves, and can make the finer and close of blank pressure.
Feedstock composition and the manufacturing process thereof of graphite-silicon carbide riser pipe provided by the invention, its beneficial effect is, technique is simple, the riser pipe of preparation has very high thermostability, in guaranteeing to use, do not burst, and the aggressiveness of anti-molten aluminum liquid is strong, overcome the corrode problem of irony riser pipe, prevented that aluminium liquid from increasing iron; Compared with current conventional silicon nitride combined silicon carbide matter riser pipe, production cost is low, and work-ing life is close, and applicable large-scale industry is applied.
Embodiment
Below in conjunction with three embodiment, feedstock composition and the manufacturing process thereof of graphite-silicon carbide riser pipe provided by the invention are described in detail.
Embodiment 1
The present embodiment is prepared the feedstock composition of graphite-silicon carbide riser pipe, comprises the raw material of following weight percent: crystalline flake graphite 40%, silicon carbide 40%, simple substance silica flour 5%, boron carbide powder 3%, resol 12%.
The manufacturing process of described graphite-silicon carbide riser pipe, comprises the following steps:
(1) the above-mentioned raw material of getting ready is put into mixing machine and mix, add water and make pug, and to be dried into fugitive constituent be 1.5% qualified pug;
(2) qualified above-mentioned gained pug is packed in mold cavity;
(3) tie up the upper and lower oral area of mould, put into isostatic pressing machine cylinder, compression moulding under 120MPa pressure;
(4) demoulding, becomes needed size by blank by machined into;
(5) blank is preheated to 190 DEG C, applies while hot anti-oxidation glaze, obtain riser pipe work in-process;
(6) above-mentioned gained work in-process are put into the naked burning of Sweet natural gas kiln, firing temperature is 1050 DEG C, makes glaze be molten into glass glaze, must burn till product;
(7) detect the above-mentioned void content that burns till product and be 10.5%, qualified, packaging warehouse-in.
Embodiment 2
The present embodiment is prepared the feedstock composition of graphite-silicon carbide riser pipe, comprises the raw material of following weight percent: crystalline flake graphite 32%, silicon carbide 45%, simple substance silica flour 6%, boron carbide powder 4%, resol 13%.
The manufacturing process of described graphite-silicon carbide riser pipe, comprises the following steps:
(1) the above-mentioned raw material of getting ready is put into mixing machine and mix, add water and make pug, and to be dried into fugitive constituent be 1.4% qualified pug;
(2) qualified above-mentioned gained pug is packed in mold cavity;
(3) tie up the upper and lower oral area of mould, put into isostatic pressing machine cylinder, under 110MPa pressure, compression moulding;
(4) demoulding, becomes needed size by blank by machined into;
(5) blank is preheated to 200 DEG C, applies while hot anti-oxidation glaze, obtain riser pipe work in-process;
(6) above-mentioned gained work in-process are put into the naked burning of Sweet natural gas kiln, firing temperature is 1100 DEG C, makes glaze be molten into glass glaze, must burn till product;
(7) detect the above-mentioned void content that burns till product and be 11.2%, qualified, packaging warehouse-in.
Embodiment 3
The present embodiment is prepared the feedstock composition of graphite-silicon carbide riser pipe, comprises the raw material of following weight percent: crystalline flake graphite 45%, silicon carbide 34%, simple substance silica flour 8%, boron carbide powder 2%, resol 11%.
The manufacturing process of described graphite-silicon carbide riser pipe, comprises the following steps:
(1) the above-mentioned raw material of getting ready is put into mixing machine and mix, add water and make pug, and to be dried into fugitive constituent be 1.6% qualified pug;
(2) qualified above-mentioned gained pug is packed in mold cavity;
(3) tie up the upper and lower oral area of mould, put into isostatic pressing machine cylinder, under 105MPa pressure, compression moulding;
(4) demoulding, becomes needed size by blank by machined into;
(5) blank is preheated to 220 DEG C, applies while hot anti-oxidation glaze, obtain riser pipe work in-process;
(6) above-mentioned gained work in-process are put into the naked burning of Sweet natural gas kiln, firing temperature is 1150 DEG C, makes glaze be molten into glass glaze, must burn till product;
(7) detect the above-mentioned void content that burns till product and be 9.8%, qualified, packaging warehouse-in.
Claims (5)
1. a feedstock composition for graphite-silicon carbide riser pipe, is characterized in that: it comprises the raw material of following weight percent:
Crystalline flake graphite 30%-50%, silicon carbide 20%-50%, simple substance silica flour 4%-10%, boron carbide powder 1%-5%, bonding agent 10%-14%.
2. the feedstock composition of graphite-silicon carbide riser pipe according to claim 1, is characterized in that: the carbon content of described crystalline flake graphite is greater than 90%, granularity is 50-100 order.
3. the feedstock composition of graphite-silicon carbide riser pipe according to claim 1, is characterized in that: the purity of described silicon carbide is greater than 90%.
4. the feedstock composition of graphite-silicon carbide riser pipe according to claim 1, is characterized in that: described bonding agent is resol.
5. a manufacturing process for graphite-silicon carbide riser pipe described in claim 1, is characterized in that: it comprises the following steps:
(1) raw material of getting ready is put into mixing machine and mix, making fugitive constituent is the qualified pug of 1%-2%;
(2) qualified above-mentioned gained pug is packed in mold cavity;
(3) put into isostatic pressing machine cylinder, compression moulding under 100MPa-120MPa pressure;
(4) demoulding, becomes needed size by blank by machined into;
(5) blank is preheated to 180 DEG C-230 DEG C, applies while hot anti-oxidation glaze, obtain riser pipe work in-process;
(6) above-mentioned gained work in-process are put into the naked burning of Sweet natural gas kiln, firing temperature is 1000 DEG C-1200 DEG C, makes glaze be molten into glass glaze, must burn till product;
(7) detect the above-mentioned void content that burns till product, void content, for being not more than 12%, gets product.
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| CN201410193124.6A CN103964876A (en) | 2014-05-09 | 2014-05-09 | Raw material composition for graphite-silicon carbide riser tube and manufacturing process thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104961475A (en) * | 2015-06-10 | 2015-10-07 | 马鞍山金晟工业设计有限公司 | Carbon refractory material for furnace liners, and preparation method thereof |
| CN106810265A (en) * | 2015-11-27 | 2017-06-09 | 衡阳凯新特种材料科技有限公司 | A kind of preparation method of silicon nitride protecting tube |
| CN107140996A (en) * | 2017-05-17 | 2017-09-08 | 中钢集团洛阳耐火材料研究院有限公司 | A kind of carborundum graphite stalk and preparation method |
| CN107721431A (en) * | 2017-10-31 | 2018-02-23 | 湖南国盛石墨科技有限公司 | The application of spent FCC catalyst and preparation and its application using spent FCC catalyst as graphite/ceramic matric composite of raw material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101348371A (en) * | 2008-09-03 | 2009-01-21 | 山东硅苑新材料科技股份有限公司 | Lift tube for low-voltage cast aluminum and preparation thereof |
| CN101591169A (en) * | 2009-05-22 | 2009-12-02 | 浙江东新密封有限公司 | A kind of silicon carbide carbonized complex phase ceramic sealing material and preparation method thereof |
-
2014
- 2014-05-09 CN CN201410193124.6A patent/CN103964876A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101348371A (en) * | 2008-09-03 | 2009-01-21 | 山东硅苑新材料科技股份有限公司 | Lift tube for low-voltage cast aluminum and preparation thereof |
| CN101591169A (en) * | 2009-05-22 | 2009-12-02 | 浙江东新密封有限公司 | A kind of silicon carbide carbonized complex phase ceramic sealing material and preparation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104961475A (en) * | 2015-06-10 | 2015-10-07 | 马鞍山金晟工业设计有限公司 | Carbon refractory material for furnace liners, and preparation method thereof |
| CN106810265A (en) * | 2015-11-27 | 2017-06-09 | 衡阳凯新特种材料科技有限公司 | A kind of preparation method of silicon nitride protecting tube |
| CN107140996A (en) * | 2017-05-17 | 2017-09-08 | 中钢集团洛阳耐火材料研究院有限公司 | A kind of carborundum graphite stalk and preparation method |
| CN107140996B (en) * | 2017-05-17 | 2020-10-02 | 中钢集团洛阳耐火材料研究院有限公司 | Silicon carbide-graphite lift tube and preparation method thereof |
| CN107721431A (en) * | 2017-10-31 | 2018-02-23 | 湖南国盛石墨科技有限公司 | The application of spent FCC catalyst and preparation and its application using spent FCC catalyst as graphite/ceramic matric composite of raw material |
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Application publication date: 20140806 |