CN1126933C - Method for making ceramic crucible - Google Patents

Abstract

The present invention relates to a method for making ceramic crucibles, which is characterized in that a required ceramic crucible can be obtained by the steps: a model is manufactured; besides, a slurry material with qualified viscosity is prepared; then, the slurry material and dry sand are respectively repeatedly coated and spread on the outer surface of the model in sequence until the thickness meets that of the ceramic crucible; the model is naturally dried after demoulding; finally, the model is sintered at high temperature. The ceramic crucible manufacture in the present invention has voidage among sand particles in the wall. When the temperature of the ceramic crucible rapidly changes, the present invention can enhance the performance of resisting rapid heat and coldness, prevent the ceramic crucible from breaking, extend the service life of the ceramic crucible and simultaneously reduce manufacture cost of the ceramic crucible.

Description

A kind of preparation method of ceramic crucible

The present invention relates to a kind of preparation method of ceramic crucible.

The preparation method that high purity alumina crucible is traditional is with the moulding of gypsum mould grouting method, be about to aluminum oxide fine powder and suitable quantity of water wet mixing mill in ball mill, make aluminum oxide fine powder evenly be suspended in form slurry in the solution, be injected with then in the plaster mold of water absorbing properties, through behind the certain hour, slurry is adsorbed on the gypsum die wall, when wall thickness reaches requirement, the slurry that is not adsorbed in the plaster mold is discharged, in plaster mold, leave one deck and be adsorbed on the slurry that solidifies on the gypsum die wall, carry out the demoulding after to be dried, become the crucible base substrate, obtain crucible through high temperature sintering again.The crucible of Zhi Zuoing like this, when the temperature of using takes place sharply to change, anti-rapid heat cycle poor performance, crucible breaks easily, and service life is short.

The objective of the invention is shortcoming, propose a kind ofly when serviceability temperature takes place sharply to change, can improve anti-rapid heat cycle performance and service life, the preparation method of the ceramic crucible that cost of manufacture is low at above-mentioned existence.

A kind of preparation method of ceramic crucible is characterized in that:

A. molding, the shape of model and size determine that on demand cast material is selected wax, resin, plastics or timber for use;

B. prepare slurry, this slurry comprises binding agent and refractory material, and its viscosity should satisfy following requirement, is the 100ml volume, the leakage cup of band Φ 6mm small opening, and its time of having leaked is 15 seconds～30 seconds;

C. apply, stucco, on the outer surface of model, adopt the method for coating, the qualified slurry of coating viscosity, behind the intact one deck slurry of every coating, spread dry sand immediately, treat its air dry in 4 hours～8 hours, apply one deck slurry down again, the granularity that ground floor spreads dry sand is 0.2mm～0.25mm, the granularity that the second layer spreads dry sand is 0.40mm～0.45mm, the 3rd layer reaches the granularity of spreading later dry sand is 0.63mm～0.80mm, repeats the 3rd layer of coating coating slurry successively, spreads the dry sand practice, until satisfying the ceramic crucible wall thickness;

D. the demoulding obtains required ceramic crucible base substrate behind the removal model, carries out air dry;

E. carry out high temperature sintering, the ceramic crucible base substrate of air dry is placed on sintering under 1300 ℃～1500 ℃ high temperature, promptly obtain required ceramic crucible.

Because the present invention adopts coating coating slurry, spread the method for dry sand and make ceramic crucible, make between the sand grains of ceramic crucible and have the space, when ceramic crucible heated, the fire sand intergranular had the expansion space, thereby when the ceramic crucible temperature sharply changes, improved its anti-rapid heat cycle performance, prevent that ceramic crucible from breaking, improved the service life of ceramic crucible, reduced the cost of manufacture of ceramic crucible simultaneously.

Description of drawings

Fig. 1 is the crucible die cutaway view.

Fig. 2 is the cutaway view that coats crucible before the demoulding of the present invention.

Fig. 3 is a crucible base substrate cutaway view after the demoulding of the present invention.

Embodiment 1: make corundum matter crucible

A. at first press the size analogue formation 1 of crucible; B. prepare slurry by following component: SiO ₂Content is 20%～30% Ludox 100kg, W ₂₀Schmigel 207kg～225kg, kaolin powder 23kg～25kg, JFC wetting agent 5ml～10ml, n-octyl alcohol defoamer 4ml～8ml.With the slurry 100ml volume of preparation, the leakage cup of band Φ 6mm small opening is checked viscosity, should leak its slurry at 18 seconds～25 seconds; C. apply, stucco, after adopting the qualified ground floor slurry of the above-mentioned preparation viscosity of coating on the outer surface of model, spreading immediately with the granularity is the dried emergy of 0.2mm～0.25mm, treat its air dry in 5 hours after, be coated with application SiO again ₂Content is 20%～30% Ludox 100kg, W ₂₀Schmigel 190kg～207kg, the slurry of kaolin powder 20kg～23kg preparation are as second layer coating, and the viscosity of this slurry 100ml volume is with the leakage cup of Φ 6mm small opening to check viscosity, should leak slurry at 16 seconds～20 seconds; After having applied second layer slurry, spreading immediately with the granularity is the dried emergy of 0.40mm, after treating its air dry in 7 hours, apply the slurry of preparation for the second time again, after having applied the 3rd layer of slurry, spreading immediately with the granularity is the dried emergy of 0.63mm～0.80mm, again after air dry in 6 hours, repeating to apply the slurry of preparation for the second time successively and spreading with the granularity is the dried emergy of 0.63mm～0.80mm, till satisfying the crucible wall thickness; D. the demoulding is closed crucible base substrate 2 is carried out air dry; E. the crucible base substrate of air dry is put into and carried out sintering under 1300 ℃～1500 ℃ high temperature and obtain corundum matter crucible.

Embodiment 2: make alumina crucible

A. at first molding; B. prepare slurry by following component: SiO ₂Content is 20%～30% Ludox 100kg, commercial alumina 190kg～207kg through temperature calcination more than 1300 ℃, kaolin powder 20kg～23kg, JFC wetting agent 5ml～10ml, n-octyl alcohol defoamer 4ml～8ml, this slurry 100ml volume, the leakage cup of band Φ 6mm small opening is checked viscosity, should leak slurry at 18 seconds～25 seconds; C. apply, stucco, behind the qualified ground floor slurry of the above-mentioned preparation viscosity of coating on the outer surface of model, spreading immediately with the granularity is the dried emergy of 0.2mm～0.25mm, treat its air dry in 5 hours after, be coated with application SiO again ₂Content is 20%～30% Ludox 100kg, commercial alumina 190kg～207kg through temperature calcination more than 1300 ℃, the slurry of kaolin powder 20kg～23kg preparation, the viscosity of this slurry also should have been leaked slurry at 16 seconds～20 seconds with above-mentioned leakage cup inspection, after being coated with second layer slurry, spreading immediately with the granularity is the dried emergy of 0.40mm, treat its air dry in 6 hours, then behind the slurry that coating prepares for the second time again, spread dried emergy immediately with 0.63mm～0.80mm, through air dry in 6 hours, repeating to apply the slurry of preparation for the second time successively and spreading with the granularity was the dried emergy of 0.63mm～0.80mm, up to satisfying the crucible wall thickness again; D. after the demoulding crucible base substrate is carried out air dry; E. the crucible base substrate of air dry is carried out 1300 ℃～1500 ℃ high temperature sinterings and obtain alumina crucible.

Embodiment 3: preparation deposite metal crucible

A. the size analogue formation 1 of crucible at first on demand; B. prepare slurry by following component: SiO ₂Content is 20%～30% Ludox 100kg, W ₂₀Schmigel 207kg～225kg, kaolin powder 23kg～25kg, JFC wetting agent 5ml～10ml, n-octyl alcohol defoamer 4ml～8ml.With the slurry 100ml volume of preparation, the leakage cup of band Φ 6mm small opening is checked viscosity, should leak its slurry at 15 seconds～30 seconds; C. apply, stucco, on the outer surface of model, adopt the slurry of the above-mentioned preparation of coating, apply slurry after, spreading immediately with the granularity is the dried emergy of 0.2mm～0.25mm, treat its air dry in 6 hours after, continue to apply the slurry that following component prepares: SiO again ₂Content is 20%～30% Ludox 100kg, W ₂0 schmigel 190kg～207kg, kaolin powder 20kg～23kg, and use the 100ml volume, the leakage cup of band Φ 6mm small opening leaked slurry in 16 seconds～20 seconds; After having applied second layer slurry, spreading immediately with the granularity is the dried emergy of 0.40mm～0.45mm, treats its air dry in 8 hours again, then applies the 3rd layer and the slurry of using later: SiO by following component preparation again ₂Content is 20%～30% Ludox 100kg, calcining mullite powder 240kg～260kg, after having applied the 3rd layer of slurry, spread immediately with the granularity is 0.63mm～0.80mm calcining mullite sand, repeat to apply the 3rd layer slurry successively, spread with the granularity is 0.63mm～the 0.80mm calcining mullite sand practice, until satisfying the crucible wall thickness; D. carry out air dry after the demoulding; E. after the crucible base substrate 2 of air dry being put into 1300 ℃～1500 ℃ high temperature sinterings, obtain the deposite metal crucible.

Claims (1)

1. the preparation method of a ceramic crucible is characterized in that:

A. molding, the shape of model and size determine that on demand cast material is selected wax, resin, plastics or timber for use;

B. prepare slurry, this slurry comprises binding agent and refractory material, and its viscosity should satisfy following requirement, is the 100ml volume, the leakage cup of band Φ 6mm small opening, and its time of having leaked is 15 seconds～30 seconds;

C. apply, stucco, on the outer surface of model, adopt the method for coating, the qualified slurry of coating viscosity, behind the intact one deck slurry of every coating, spread dry sand immediately, treat its air dry in 4 hours～8 hours, apply one deck slurry down again, the granularity that ground floor spreads dry sand is 0.2mm～0.25mm, the granularity that the second layer spreads dry sand is 0.40mm～0.45mm, the 3rd layer reaches the granularity of spreading later dry sand is 0.63mm～0.80mm, repeats the 3rd layer of coating coating slurry successively, spreads the dry sand practice, until satisfying the ceramic crucible wall thickness;

D. the demoulding obtains required ceramic crucible base substrate behind the removal model, carries out air dry;

E. carry out high temperature sintering, the ceramic crucible base substrate of air dry is placed on sintering under 1300 ℃～1500 ℃ high temperature, promptly obtain required ceramic crucible.

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