Method of heat treatment of glass products

专利摘要:
The invention relates to the glass industry. In order to increase the strength of glass products after ion-exchange treatment in the method of thermal processing of glass products intended for ion exchange hardening, the glass products are kept at Ttp + 20 ° C T Ttp - 60 ° C, where Ttp is the transformation temperature during not less than 40 minutes Thus, a reduction in the fictitious temperature is achieved, which leads to a slowing down or complete elimination of the relaxation of the voltage arising during the ion exchange. The resultant reinforcing stress in compression and the strength of glass products achieved are thereby increased. At the same time, the treatment time in the strengthening bath is reduced, or the need to use a special expensive and refractory glass melt with high viscosity is eliminated. The heat treatment also affects the refractive index of the surface film in such a way that a large difference in the refractive index between the surface and the inside of the glass is achieved. cl
公开号:SU1677028A1
申请号:SU877774657
申请日:1987-12-18
公开日:1991-09-15
发明作者:Юрий Кузьмич Старцев；Владимир Новотны
申请人:Статни Вызкумны Устав Скларски (Инопредприятие)；Институт Химии Силикатов；
IPC主号:

专利说明:

FIELD OF THE INVENTION The invention relates to the glass industry and relates to a process for the heat treatment of glass products intended for ion exchange hardening.
The known method of heat treatment of glass products intended for strengthening by ion exchange, including the processing of sodium-calcium silicate glasses at 460-650 ° C for 5-30 minutes.
However, the known method does not provide sufficient strength of the glassware after ion exchange processing.
The purpose of the invention is to increase the strength of glass products after ion exchange processing.
The proposed method of heat treatment of glass is that the products are kept at a temperature in the transformation interval of the glass from which they are made, namely at a temperature corresponding to the dilatometric transformation temperature of said glass from +20 to 90-60 ° C for at least 40 minutes. In practice, the heat treatment time does not usually exceed 24 hours. Thus, a reduction in the fictitious temperature is achieved, which leads to a slowing down or complete elimination of the relaxation of the voltage arising during the ion exchange.
A fictitious (structural) temperature is the temperature to which the momentary structural state of glass corresponds and on which, besides the true temperature, its properties, such as density, depend.
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viscosity, refractive index, stress relaxation time, etc.
Due to the use of the proposed method, an increase in the resultant stress under compression is achieved, and due to the higher strength of the flexi cle, the N-hardening by ion exchange, the product does not need to be processed in a stronger time zone or molded from a special way and a refractory glass melt with an epp-hoss. At the same time, yy, (-, "tf. C the difference in the course of nu. IjjpiijQBc-nsgo light in the surface film and increase by -1, the difference of the refractive index of the TM surface and the internal glassware,
Pp and cp, Plates made of sheet sodium-calcium and silicate glass with a dilatometric transformation temperature of 100 x 100 mm and a thickness of 2.8 mm are heated for 1 day in a 500 ° C furnace, then transferred to a bath of molten potassium nitrate at a temperature of 170 ° G, containing not more than 0.00% calcium oxide, and leave them in it for 3 hours,
A film with a thickness of 24–26 µm with a reinforcement stress of 450 MP, with a compressive strength of plates, is 520 MPa. The specific spacing of the polarized light on the surface is 11,250 nm / cm, the maximum difference between the refractive indices between the surface and the inner part of the glass Dp 620.
Identical plastic heads processed before transferring molten potassium nigraga to the bath using an ordinary method, g.o, io, 1, pfep) -, m R is the furnace temperature from 4GO at 480 ° С for 20-30 minutes and then further a) with pdmnakopo as in the above example, they have on the surface of a film with 24 to 24 microns with reinforcing haivb1 o.-cm run bowls only 300 MPa. Ouds, | um spacing the course of the polarized transverse to -., i - WED - pp - o: pl l is 7500 nm / cm, max 1 mAp1. h difference in the values of the preferred MO.M, DU surface and the inner mmm with Ap 390 -ten ,
PRI me R P, Sheet-m laminates) 1 i jDOk LH ovosilicate glass with a range of omephic but 1-temperature transformer 52r / JC with an area of 100 x 100 mm and w / ch yup 1, 3 nm Incorporate into the furnace at a rate) / g. They are used in it with one more me 1) 0 min, then the temperature of the furnace with gnich. - Mr.-s up to 470 ° С with a speed of 2 m;
molten south potassium nitrate with a temperature of 470 ° C, containing not more than 0.001% calcium oxide and leaving them in it for 3 hours. On the surface of the plates is formed
the film is 29 microns thick with a reinforcing stress at a compression of 370 MPa; the average flexural strength of the plates is 660 MPa. The specific path difference of polarized light on the surface is 9
250 nm / cm, the maximum difference between the refractive indices between the surface and the inside of glass An 520-. Identical plates treated before transferring molten potassium nitrate to the bath using an ordinary method, i.e. heated in a furnace with a temperature from 460 to 480 ° C for 20-30 minutes and then further treated in the same way as in the above example, have on the surface
the film is 29 microns thick with a reinforcing stress at a compression of 300 MPa; the average strength of the plates at bending is 520 MPa. The specific path difference of polarized light on the surface is 1
500 nm / cm, the maximum difference between the refractive indices between the surface and the inner part of the glass is Dp 460, Example 3. Plates of sodium sheet of calcium and silicate glass with a dilztometric transformation temperature of 525 ° C with an area of 100 x 100 mm and a thickness of 2.0 mm to a furnace at a temperature of 545 ° C, leave them in it for 40 minutes, then the samples are transferred to a bath from
molten potassium nitrate with a temperature of 470 ° C, containing not more than 0.001% calcium oxide and leaving them in it for 3 hours.
A film with a thickness of 24–26 µm is formed on the surface of the plates, with a reinforcing stress of 420 MPa, the average bending strength of the plates is 620 MPa. The specific path difference of polarized light on the surface is 10,500 nm / cm, the maximum
the difference between the refractive indices between the surface and the inside of the glass An 680-10 5.
Identical plates treated before transferring molten potassium nitrate to the bath using an ordinary method, i.e. heated in an oven with a temperature of 460- 480 ° C for 20-30 minutes and then further treated equally, as in the above example, are on the surface
a film with a thickness of 24-26 microns with a reinforcing stress at a compression of 300 MPa; their flexural strength is only 480 MPa. The specific path difference of polarized light on the surface is 7
500 nm / cm, the maximum difference between the refractive indices between the surface and the inside of the glass Dp 460-.
PRI me R 4, Plates of sodium sheet of calcium and silicate glass with a thickness of 1.2 mm with a dilatometric transformation temperature of 520 ° C are heated in an oven with a temperature of 460 ° C for 2 500 h. Then the samples are put into a bath of molten potassium nitrate with a temperature of 480 ° C, containing not more than 0.001% calcium oxide, for 16h. The magnitude of the resultant reinforcement stress in compression is 550 MPa.
Identical plates treated before applying potassium nitrate to the bath using an ordinary method, i.e. heated in an oven with a temperature of 460–480 ° C for 20–30 min and then treated as in the above example show a compressive strengthening strength of only 260 MPa.
PRI me R 5. Plate of sodium sheet of calcium-silicate glass with a thickness of 1.2 mm with a dilatometric transformation temperature of 520 ° C is heated in a furnace with a temperature of 472 ° C for 2 500 h; if necessary, they can then be cooled to 20 ° C at a rate of 5-10 ° C / min and heated before heating in a bath in an oven with a temperature of 450-480 ° C for 20-30 minutes. Then the samples are put into a bath of molten potassium nitrate.
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with a temperature of 480 ° C, containing no more than 0.001% calcium oxide, 3 hours. The resultant residual voltage is 680 MPa.
Identical plates treated before transferring molten potassium nitrate to the bath using an ordinary method, i.e. heated in an oven with a temperature of 460- 480 ° C for 20-30 minutes and then treated the same way as in the above example, show a reinforcement stress at a compression of 360 MPa.
The proposed glass reinforcement method is intended primarily for thin-walled or more complexly molded products from conventional sodium-calcium silicate glass, which are subject to special requirements with regard to strength or temperature resistance. Further, taking into account its effect on the refractive index of the surface foam, it is possible to use it, for example, in the production of optoelectronic elements.

权利要求:
Claims (1)
[1]
Invention Formula
The method of heat treatment of glassware intended for hardening by ion exchange, by holding at a temperature Ttr 20 ° C T Ttr - 60 ° C, where Ttp is a transformation temperature, characterized in that, in order to increase the strength of the glassware after ion-exchange treatment Exposure lead for at least 40 minutes.
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同族专利:

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公开号 | 公开日

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CS260146B1|1988-12-15|

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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CS470787A|CS260146B1|1987-06-24|1987-06-24|Method of glass products' thermal treatment inteded for hardening by means of ion exchange|

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