CN102167595A - Control method for dewaxing process of alumina ceramic vacuum tube product with shell wall thickness of over 15 millimeters - Google Patents
Control method for dewaxing process of alumina ceramic vacuum tube product with shell wall thickness of over 15 millimeters Download PDFInfo
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- CN102167595A CN102167595A CN2010105861386A CN201010586138A CN102167595A CN 102167595 A CN102167595 A CN 102167595A CN 2010105861386 A CN2010105861386 A CN 2010105861386A CN 201010586138 A CN201010586138 A CN 201010586138A CN 102167595 A CN102167595 A CN 102167595A
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Abstract
The invention discloses a control method for a dewaxing process of an alumina ceramic vacuum tube product with the shell wall thickness of over 15 millimeters, belonging to a control method of a product produced by adopting an injection molding process. A secondary dewaxing process method is adopted in the invention. In a primary dewaxing process, wax liquid permeates into adsorption powder at certain temperature, and evaporation and combustion are not considered. In the secondary dewaxing process, a method for performing dewaxing and biscuit firing synchronously is adopted.
Description
Affiliated technical field
The invention belongs to the control method of alumina-ceramic vacuum envelope product dewaxing technique, particularly adopt the control method of the super 15mm product of the wall thickness dewaxing technique of hot die-casting molding explained hereafter.
Background technology
The dewaxing technique that alumina-ceramic vacuum envelope product is traditional is to adopt the unglazed technology that once dewaxes.But wall thickness surpasses the product of 15mm, if adopt traditional dewaxing technique, then following technical problem can appear: because the product wax content of wall thickness is many, infiltration, evaporation, the burning of wax liquid can't be synchronous when traditional dewaxing technique dewaxed, ripples shape stream wax, cracking or internal structure have occurred and suffered the destructive situation, product appearance quality, inner quality all can't guarantee the requirement of technology.So,, must take new dewaxing CONTROL PROCESS to the alumina-ceramic vacuum envelope product of wall thickness above 15mm.At present, the product of the super 15mm of alumina-ceramic vacuum envelope wall thickness is mainly used in the valve tube assembling that power industry is used, the market requirement is increasing, and a year demand is not less than 80,000, and demand for exports is not less than 30,000, and along with the fast development of industry, annual requirement will be higher than expection far away.
Summary of the invention
Hot die-casting molding technology is a kind of moulding process of widespread use on the alumina-ceramic vacuum envelope products production, is characterized in simple to operate, the dimensional precision height, and appearance is bright and clean, and the production time is short, and the efficient height does not need following process, and production cost is relatively low.This technology is strong to the raw material suitability, various raw mineral materialss are all applicable, its ultimate principle is: utilize the paraffin melted by heat to meet cold agglomerative characteristics, to there be plastic lean property alumina-ceramic powder and heated paraffin liquid uniform mixing, form the flowable slip, under certain pressure, inject metal die, treat that slip solidifies the back demoulding and takes out blank, carry out dewaxing treatment by heating then, again the blank that dewaxed is sintered into the finished product.
The present invention is the method that adopts the secondary dewaxing technique, realize the dewaxing fully of the super 15mm product of alumina-ceramic vacuum envelope wall thickness, reach product and keep original shape, and appearance is bright and clean, inner structure is not damaged, and guarantees to satisfy behind the sintering requirement of every technical indicator of product.Dewaxing technique mainly is by certain temperature wax liquid to be penetrated in the absorption powder for the first time, does not consider evaporation and burning.The dewaxing technique method taking to dewax and carry out synchronously with biscuiting for the second time.
Dewaxing technique is for the first time: filling out the powder operation is that product is placed in the fire-resistant saggar that is of the required size, and powder 25mm-30mm is filled out at the product top, and bottom and periphery are filled out powder 20mm-25mm.The absorption powder of being filled out is that powder is formulated preferably by two kinds of absorption properties, and granularity requirements is that the following powder of particle diameter 50 μ m accounts for more than 30%, and median size is controlled between the 90 μ m-120 μ m.Dewaxing temperature is controlled between 130 ℃-150 ℃, it is 10 ℃-15 ℃/hour that heating curve requires, insulation is 8-10 hour when reaching design temperature, then by slowly cooling, temperature lowering curve is controlled at 16 ℃-20 ℃/hour during cooling, up to the normal temperature state, fully after the cooling product is taken out from the absorption powder, enter dewaxing for the second time after cleaning out.
Dewaxing technique is for the second time: this technology dewaxing need continue product is wrapped up biscuiting to certain temperature then with wax liquid by the absorption of absorption powder, evaporation, burning, makes the base substrate of non-plastic that certain intensity be arranged, and is easy to next step operation.Filling out the powder operation is that product is placed in the fire-resistant saggar that is of the required size, and powder 15mm-20mm is filled out at the product top, and bottom and periphery are filled out powder 10mm-15mm.The particle diameter of absorption powder can not be meticulous when dewaxing for the second time, permeability is good when having certain space to make wax liquid combustion by evaporation, just can make the product external quality that burns keep bright and clean, and it is stable that immanent structure keeps, it is stable that quality keeps, and the median size of absorption powder is controlled between the 120 μ m-150 μ m.For the second time dewaxing temperature is controlled at 1120 ℃-1150 ℃, and during normal temperature to 600 ℃, heat-up rate control is at 23 ℃-28 ℃/hour; 600 ℃ to design temperature the time, heat-up rate is controlled at 48 ℃-54 ℃/hour; When arriving design temperature, soaking time is 3-4 hour; Design temperature to 200 ℃, cooling rate is controlled at 55 ℃-60 ℃/hour; Can freely lower the temperature after arriving 200 ℃.
Embodiment
The object of the present invention is achieved like this: the alumina-ceramic vacuum envelope product of wall thickness 20mm, dewaxing technique is for the first time: product is placed in the fire-resistant saggar that is of the required size, powder 28mm is filled out at the product top, bottom and periphery are filled out powder 23mm, the particle diameter of the absorption powder degree of being filled out is that the following powder of 50 μ m accounts for 32%, median size is controlled at 100 μ m, dewaxing temperature is controlled at 150 ℃, it is 13 ℃/hour that heating curve requires, heated up 10 hours, and when reaching 150 ℃ of the temperature of setting, be incubated 9 hours, then by slowly cooling, cooling is controlled at 18 ℃/hour during cooling, lowers the temperature about 8 hours, reaches the normal temperature state, then product is taken out from the absorption powder, enter dewaxing for the second time after cleaning out.
Dewaxing technique is for the second time: the product after the dewaxing is placed in the fire-resistant saggar that is of the required size for the first time, powder 18mm is filled out at the product top, bottom and periphery are filled out powder 12mm, the median size of absorption powder is controlled at 130 μ m, dewaxing temperature is controlled at 1120 ℃, and during normal temperature to 600 ℃, heat-up rate control is at 25 ℃/hour, after heating up about 23 hours, reach 600 ℃; In the time of 600 ℃ to 1120 ℃, heat-up rate is controlled at 50 ℃/hour, after heating up about 10.5 hours, during 1120 ℃ of temperature of arrive setting, is incubated 3.5 hours; 1120 ℃ to 200 ℃, cooling rate is controlled at 55 ℃/hour, reaches 200 ℃ after lowering the temperature about 17 hours; After 200 ℃, cooling rate is controlled at 60 ℃/hour, after about 3 hours, product is taken out from the absorption powder, enters next process after cleaning out.
Claims (3)
1. the control method of the super 15mm product of alumina-ceramic vacuum envelope wall thickness dewaxing technique is characterized in that: adopt the method for secondary dewaxing technique, dewaxing technique mainly is by certain temperature wax liquid to be penetrated in the absorption powder for the first time, does not consider evaporation and burning.The dewaxing technique method taking to dewax and carry out synchronously with biscuiting for the second time.
2. control method as claimed in claim 1, it is characterized in that: dewaxing technique for the first time, powder 25mm-30mm is filled out at the product top, bottom and periphery are filled out powder 20mm-25mm, it is that the following powder of particle diameter 50 μ m accounts for more than 30% that the absorption powder degree of being filled out requires, median size is controlled between the 90 μ m-120 μ m, dewaxing temperature is controlled between 130 ℃-150 ℃, heating curve is 10 ℃-15 ℃/hour, insulation is 8-10 hour when reaching design temperature, temperature lowering curve is controlled at 16 ℃-20 ℃/hour during cooling, up to the normal temperature state.
3. control method as claimed in claim 1, it is characterized in that: dewaxing technique for the second time, powder 15mm-20mm is filled out at the product top, bottom and periphery are filled out powder 10mm-15mm, the median size of absorption powder is controlled between the 120 μ m-150 μ m, dewaxing temperature is controlled at 1120 ℃-1150 ℃, during normal temperature to 600 ℃, heat-up rate control is at 23 ℃-28 ℃/hour, and 600 ℃ to design temperature the time, heat-up rate is controlled at 48 ℃-54 ℃/hour, when arriving design temperature, soaking time is 3-4 hour, design temperature to 200 ℃, cooling rate is controlled at 55 ℃-60 ℃/hour, can freely lower the temperature after arriving 200 ℃.
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| CN 201010586138 CN102167595B (en) | 2010-12-04 | 2010-12-04 | Control method for dewaxing process of alumina ceramic vacuum tube product with shell wall thickness of over 15 millimeters |
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| CN 201010586138 CN102167595B (en) | 2010-12-04 | 2010-12-04 | Control method for dewaxing process of alumina ceramic vacuum tube product with shell wall thickness of over 15 millimeters |
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| CN102167595A true CN102167595A (en) | 2011-08-31 |
| CN102167595B CN102167595B (en) | 2013-08-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107473751A (en) * | 2017-07-27 | 2017-12-15 | 佛山市非特新材料有限公司 | A kind of preparation method of two-part sintering ceramic mold core |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08259329A (en) * | 1995-03-22 | 1996-10-08 | Sumitomo Metal Ind Ltd | Aln continuous baking furnace |
| CN101250057A (en) * | 2007-12-14 | 2008-08-27 | 陈国安 | CaO-Al2O3-MgO-ZrO2-SiO2 series aluminum oxide electronic ceramics |
| CN101698613A (en) * | 2009-06-05 | 2010-04-28 | 西安交通大学 | Degreasing method used for transparent alumina ceramic injection molding product |
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2010
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08259329A (en) * | 1995-03-22 | 1996-10-08 | Sumitomo Metal Ind Ltd | Aln continuous baking furnace |
| CN101250057A (en) * | 2007-12-14 | 2008-08-27 | 陈国安 | CaO-Al2O3-MgO-ZrO2-SiO2 series aluminum oxide electronic ceramics |
| CN101698613A (en) * | 2009-06-05 | 2010-04-28 | 西安交通大学 | Degreasing method used for transparent alumina ceramic injection molding product |
Non-Patent Citations (4)
| Title |
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| 《Journal of Materials Processing Technology》 19981231 Teisuke Sato et al. "A new near net-shape forming process for alumina" 第125-132页 1-3 , 第79期 * |
| 《现代技术陶瓷》 20021231 汤竑 等 "氧化铝制品低温排蜡新工艺的研究" 第12-14页 1-3 , 第1期 * |
| TEISUKE SATO ET AL.: ""A new near net-shape forming process for alumina"", 《JOURNAL OF MATERIALS PROCESSING TECHNOLOGY》, no. 79, 31 December 1998 (1998-12-31), pages 125 - 132 * |
| 汤竑 等: ""氧化铝制品低温排蜡新工艺的研究"", 《现代技术陶瓷》, no. 1, 31 December 2002 (2002-12-31), pages 12 - 14 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107473751A (en) * | 2017-07-27 | 2017-12-15 | 佛山市非特新材料有限公司 | A kind of preparation method of two-part sintering ceramic mold core |
| CN107473751B (en) * | 2017-07-27 | 2019-10-25 | 佛山市非特新材料有限公司 | A kind of production method of two-part sintering ceramic mold core |
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