CN101209892A - Method for preparing special-shaped workable glass ceramic - Google Patents
Method for preparing special-shaped workable glass ceramic Download PDFInfo
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- CN101209892A CN101209892A CNA2007101158525A CN200710115852A CN101209892A CN 101209892 A CN101209892 A CN 101209892A CN A2007101158525 A CNA2007101158525 A CN A2007101158525A CN 200710115852 A CN200710115852 A CN 200710115852A CN 101209892 A CN101209892 A CN 101209892A
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Abstract
The invention discloses a preparation method of irregular workable glass ceramic, which relates to the preparation field of workable glass ceramic and is characterized in that base glass is put into a mould or a gasket with the desired shape, and the irregular workable glass ceramic is obtained after heat treatment under pressure; in the process of the heat treatment, firstly the base glass is rapidly heated up, thus the base glass has plastic deformation capacity before crystallization; secondly at crystallization temperature, the temperature is preserved and crystallization is carried out. So when the glass crystallization is completed, not only shape stability and stable performance can be guaranteed, but also the workability of the glass ceramic material. The invention overcomes the disadvantages that in the preparation process of the traditional workable glass ceramic, relatively thin and complex components are mainly produced and processed by machine, and greatly reduces the loss of the process and the production cost of the workable glass ceramic.
Description
Technical field
The present invention relates to the workable glass ceramic preparation field, relate in particular to the method that a kind of parent glass plastic deformation in heat treatment process prepares the special-shaped glass pottery.
Background technology
Properties such as that stupalith has is superhard, wear-resisting, high-melting-point, high resistivity, heat conduction, resistance to chemical attack, but for most stupaliths, relatively be difficult to mechanical workout.The working method of traditional ceramics has mechanical processing method, chemical method, optical method, mechanics method, electrochemical process, electric method etc.In these working methods, the efficient height of machining process, thereby in industrial acquisition widespread use, though pottery processing method is numerous, tooling cost is very high, and working (machining) efficiency is low, and working accuracy is poor, and its one of the main reasons is that the hardness of pottery is very high.Processing for traditional ceramics, do not burn body or the roasting body mainly carries out roughing with machining, carry out precision work with grinding behind the sintering, the problem that exists is that the process tool expense is big, and the machining of pottery need be used sintered diamond, the CBN cutter of high price, and precision work also is based on diamond wheel, therefore the cutter expense is to exceed tens of times to hundred times of metal cutting cutter for same, in addition, the intensity of pottery is responsive for processing conditions, is difficult to realize high-level efficiency processing.
The workability that solves stupalith that appears as of workable glass ceramic provides possibility.Workable glass ceramic is except that having the advantage that general stupalith has, and more outstanding characteristic is that it has machinability, and available universal machine machining tool and equipment carry out car, mill, dig, grind, saw, cut and processing such as tapping.Simultaneously the thermal shock resistance of processable ceramic is very good, from 800 ℃ be chilled to 0 ℃ not broken, 200 ℃ are quenched to 0 ℃ of intensity and do not change.But therefore workable glass ceramic widespread use automobile, military project, aerospace, precision instrument, medical facilities, electron tube, electron beam exposure machine, textile manufacturing machine, transmitter, mass spectrograph and energy spectrometer etc., it is than boron nitride intensity height, and the venting rate is low; More high temperature resistant than tetrafluoroethylene, indeformable, never degenerate.But temperature is higher during owing to the workable glass ceramic molten glass, and its moulding process is not easy operation; The parent glass viscosity of workable glass ceramic is big, mobile poor simultaneously, and the service temperature interval of moulding is less, so the shape of the parent glass that forms is based on bar-shaped or tabular.Thermal treatment process is very crucial to the processability that forms glass ceramic material, and the rational heat treatment system is the assurance that obtains workability.In heat treatment process, parent glass obtains the glass ceramic material of required weave construction by forming core and crystallization.It is generally acknowledged, will influence the performance of material if the parent glass material deforms in heat treatment process, make the shape of material restive simultaneously, therefore avoiding the distortion of material in heat treatment process is the direction of everybody effort always.In the generally whole process, make parent glass keep original shape by adjusting thermal treatment rate of heating and temperature, after instant heating is finished dealing with, glass-ceramic keeps the bar-shaped or tabular of its parent glass, the complicated shape of final material is mainly finished by mechanical workout, like this for the different shape complexity, and accurate in size shaped piece, the process redundancy that needs is just bigger, will inevitably cause the waste of material and the increase of processing charges.
Summary of the invention
For reducing process redundancy, conservation, the reduction processing charges of workable glass ceramic, the invention provides a kind of preparation method of special-shaped workable glass ceramic.
The preparation method of a kind of special-shaped workable glass ceramic of the present invention is that desired raw material is mixed in proportion; In High Temperature Furnaces Heating Apparatus, carry out melt processed; Glass melt is cast to air cooling obtains parent glass in the mould; Parent glass thermal treatment is formed glass-ceramic;
Characteristics are parent glass to be put into the mould or the pad of desired shape, heat-treat under pressure and obtain the special-shaped workable glass ceramic material;
Parent glass is rapidly heated, makes parent glass before crystallization, have plastic deformation ability;
Under certain pressure, be out of shape then, obtain required shape after, insulation is carried out crystallization under recrystallization temperature, the shape of glass ceramic material and stable performance and have workability after crystallization is finished.
In order to reach corresponding technological conditions, generally adopt in heat treatment process, heat-up rate is 10～20 ℃ of min
-1, temperature reaches 880～950 ℃, soaking time 2～5h, pressure 10～50MPa.
The present invention utilizes parent glass in heat treatment process, by being rapidly heated, suppresses the crystallization of parent glass, keeps a large amount of glassy phases and exists.Like this along with the raising of thermal treatment temp, the viscosity degradation of parent glass, when reaching certain temperature, can possess certain plastic deformation ability, like this can be by mould or the pad and the shape that applies certain pressure change glass ceramic material of desired shape, preparation special-shaped workable glass ceramic material.Because parent glass is rapidly heated in heat treatment process, the crystallization that has suppressed glass, make parent glass when reaching recrystallization temperature based on glassy phase, have plastic deformation ability, insulation is carried out crystallization under recrystallization temperature then, along with the carrying out of crystallization in the glass, glassy phase reduces, and crystal increases mutually, the viscosity of glass-ceramic increases, after crystallization is finished like this, in the glass-ceramic based on crystal mutually, glass ceramic material shape and stable performance and have workability.
The process redundancy that the present invention utilizes the distortion in the parent glass heat treatment process to prepare the odd-shaped processable ceramic descends 3%～30%, processing charges descends 5%～15%, like this after devitrification of glass is finished, not only can guarantee the stable of glass ceramic material shape and performance, and can guarantee that it has workability.The main mechanical workout that relies on is made shortcoming thin, complex component in the traditional workable glass ceramic preparation process of this invention improvement, has reduced the loss in the course of processing significantly, the production cost of reduction workable glass ceramic.
Embodiment:
| The raw material shape | Thermal treatment process | Final cross-sectional shape | Pressure/MPa | Remarks | |||
| Temperature/℃ | Heat-up rate/℃ min -1 | Soaking time/h | |||||
| Embodiment 1 | Bar Φ 25 * 100 | 900 | 10 | 3 | 0 °～30 ° of trapezoidal gradients | 20～50 | Need identical shaped mould |
| Embodiment 2 | Bar Φ 25 * 100 | 950 | 20 | 2 | Centre hole Φ 1～15mm | 10～20 | |
| Embodiment 3 | Bar Φ 25 * 100 | 900 | 10 | 3 | Elliptical cylinder-shape thickness 50～100mm | 20～50 | |
| Embodiment 4 | Bar Φ 25 * 100 | 900 | 20 | 3 | Step Φ 25～50 * 25～100 | 30～50 | |
| Embodiment 5 | Plate 100 * 100 * 5 | 880 | 10 | 5 | 90 ° of flaps | 20～30 | Need identical shaped backing plate |
| Embodiment 6 | Plate 100 * 100 * 5 | 880 | 10 | 5 | 150 ° of flaps | 10～30 | |
| Embodiment 7 | Plate 100 * 100 * 5 | 900 | 20 | 3 | Z-shaped plate | 20～50 | |
| Embodiment 8 | Plate 50 * 50 * 5 | 950 | 15 | 2 | 100 * 100 * 1～2 thin plates | 10～20 | |
Claims (2)
1. the preparation method of a special-shaped workable glass ceramic is that desired raw material is mixed in proportion; In High Temperature Furnaces Heating Apparatus, carry out melt processed; Glass melt is cast to air cooling obtains parent glass in the mould; Parent glass thermal treatment is formed glass-ceramic, it is characterized in that:
Described is mould or the pad of parent glass being put into desired shape with parent glass thermal treatment, heat-treats under pressure and obtains the special-shaped workable glass ceramic material;
Parent glass is rapidly heated, makes parent glass before crystallization, have plastic deformation ability;
Under certain pressure, be out of shape then, obtain required shape after, insulation is carried out crystallization under recrystallization temperature, the shape of glass ceramic material and stable performance and have workability after crystallization is finished.
2. the preparation method of special-shaped workable glass ceramic as claimed in claim 1 is characterized in that, in the described heat treatment process, heat-up rate is 10～20 ℃ of min
-1, temperature reaches 880～950, soaking time 2～5h, pressure 10～50MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101158525A CN101209892A (en) | 2007-12-25 | 2007-12-25 | Method for preparing special-shaped workable glass ceramic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101158525A CN101209892A (en) | 2007-12-25 | 2007-12-25 | Method for preparing special-shaped workable glass ceramic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101209892A true CN101209892A (en) | 2008-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101158525A Pending CN101209892A (en) | 2007-12-25 | 2007-12-25 | Method for preparing special-shaped workable glass ceramic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101209892A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103274588A (en) * | 2013-05-03 | 2013-09-04 | 中国科学院过程工程研究所 | Crystallization method for regulating and controlling microcrystalline glass by utilizing deformation |
-
2007
- 2007-12-25 CN CNA2007101158525A patent/CN101209892A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103274588A (en) * | 2013-05-03 | 2013-09-04 | 中国科学院过程工程研究所 | Crystallization method for regulating and controlling microcrystalline glass by utilizing deformation |
| CN103274588B (en) * | 2013-05-03 | 2016-04-06 | 中国科学院过程工程研究所 | A kind of Crystallization method utilizing deformation to regulate and control devitrified glass |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Open date: 20080702 |