Contact panel chilled glass changes the method for material reprocessingTechnical field
The present invention relates to chemically reinforced glass working method, be specifically related to a kind of method that contact panel chilled glass changes material reprocessing.
Background technology
Chemical enhancedly be the sodium ion in glass and between the potassium ion in melting salt, ion-exchange occur, chemical enhanced principle: glass is immersed in the saltpetre fused salt of certain temperature, Na+ ion in glass and the K+ ion generation ion-exchange in fused salt, because the radius ratio Na+ ion of K+ ion is large, K+ ion replaces the Na+ ion in glass, expanded in surface " jammed ", make glass surface form compressive stress layers thus improve the method for physical strength.Chemically reinforced glass characteristic index has surface compression stress (CS) and stress under compression layer depth (DOL).CS refers to that the ion making to have more volume by ion-exchange invades surface layer of glass and the stress under compression that produces.DOL refers to the degree of depth having the region of stress under compression formed for benchmark with glass outermost layer.Conventional 8 ~ 50 μm of the degree of depth of compressive stress layers.In the inside glass more than the DOL degree of depth, in order to keep balancing with the stress under compression that produces in compressive stress layers and create strong tensile stress (CT).
Due to the existence of chilled glass Surface stress layer, when glass cuts, line break bar can not cut stressor layers,
There is the situation of line break bar one side skidding one side cutting.Line break bar advancing in chilled glass surface imperfection, greatly reduces the break bar life-span, and irregular splitting causes the bad increase of glass simultaneously.Even if glass can cut, when the crack depth cutting glass acts on tensile stress region, tensile stress can make crackle spontaneously advance, and glass can smashingly break.Usually, as DOL > 25 μm, the mode that glass is difficult to be rule by break bar cuts.
In prior art, cover-plate glass routine is reprocessed and is adopted twin polishing mode to polish removal Surface stress layer, and this kind of mode thickness of glass reduces, easily lower than thickness specification.As two-sided stress is removed uneven during polishing, glass warp can be caused bad.
Summary of the invention
The object of the invention is to provide a kind of method that contact panel chilled glass changes material reprocessing, by the layer that eliminates stress, thus makes that glass is smooth and easy to be cut.
To achieve these goals, the present invention adopts technical scheme as follows:
Contact panel chilled glass changes a method for material reprocessing, comprises following operation:
Reverse tempering operation, is placed in fused salt by chilled glass and carries out ion-exchange, and fused salt adopts NaNO3 fused salt, and molten temperature is 380-450 DEG C, and ion-exchange time is 5-7h; And annealing operation, the glass after ion-exchange is annealed, annealing temperature 500-550 DEG C, annealing 2-4h.
Above-mentioned contact panel chilled glass change material reprocessing method preferred version, also comprise preheating procedure before reverse tempering operation, the preferable temperature of thermal pretreatment is 250-380 DEG C, warm up time 1-1.5h.
Above-mentioned contact panel chilled glass changes the method preferred version of material reprocessing, also comprises following operation: anneal complete, chilled glass is taken out annealing furnace, naturally cool to normal temperature in atmosphere after annealing operation.
Above-mentioned contact panel chilled glass changes the method preferred version of material reprocessing, to the operation that the chilled glass naturally cooling to normal temperature utilizes ordinary method to clean.
Above-mentioned contact panel chilled glass changes either a program in the method preferred version of material reprocessing, also comprises and adopt the method for touch-screen or cover plate industry routine to clean glass and the operation of drying before reverse tempering operation.
Reverse tempering operation principle is as follows: chilled glass is immersed NaNO3 fused salt, and the Na+ that namely actionradius is little replaces the large K+ of radius.
Beneficial effect of the present invention:
Reverse tempering operation, can be made glass surface chemistry strengthen (potassium ion that ion-exchange enters) and again be cemented out by reverse tempering; After reverse tempering, glass surface still has unrelieved stress to exist, and in conjunction with annealing operation, eliminates surface residual stress, reaches the object of the layer that eliminates stress; Coordinate by reverse tempering operation and annealing operation the layer that eliminates stress, thus make that glass is smooth and easy to be cut.
Embodiment
More detailed description is done to the present invention below, can implement according to this after studying this explanation carefully to make those skilled in the art person.
Contact panel chilled glass changes a method for material reprocessing, comprises following operation:
1) operation of cleaning and drying, adopts the method for touch-screen or cover plate industry routine, uses clean-out system to adopt multiple-grooved Ultrasonic Cleaners, cleans, guarantee clean surface, avoided impurity to mix fused salt and caused bad chilled glass;
2) preheating procedure, the preferable temperature of thermal pretreatment is 250-380 DEG C, warm up time 1-1.5h;
3) reverse tempering operation, is placed in fused salt and carries out ion-exchange by chilled glass, fused salt adopts NaNO3 fused salt, and molten temperature is 380-450 DEG C, and ion-exchange time is 5-7h;
4) annealing operation, anneals the glass after ion-exchange, annealing temperature 500-550 DEG C, annealing 2-4h;
5) naturally cooling operation: anneal complete, chilled glass is taken out annealing furnace, naturally cool to normal temperature in atmosphere;
6) matting again: pure water ultrasonic cleaning is carried out to cooled glass, removes surperficial fused salt.
In the embodiment of the present invention, chilled glass is reinforced aluminum silex glass, stressor layers degree of depth DOL=40 ± 5 μm, after adopting method process of the present invention, utilizes glass surface taseometer FSM-6000 test surfaces stress CS and stressor layers degree of depth DOL to eliminate.
Above only describes ultimate principle of the present invention and preferred implementation, those skilled in the art can make many changes and improvements according to foregoing description, and these changes and improvements should belong to protection scope of the present invention.