CN102850058B - Sintering method of ceramic concentric sphere - Google Patents
Sintering method of ceramic concentric sphere Download PDFInfo
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- CN102850058B CN102850058B CN201110187247.5A CN201110187247A CN102850058B CN 102850058 B CN102850058 B CN 102850058B CN 201110187247 A CN201110187247 A CN 201110187247A CN 102850058 B CN102850058 B CN 102850058B
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- ceramic ball
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- right cylinder
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Abstract
The invention discloses a cylinder which is prepared from two upper and lower pieces and a green material which is has the same material with a ceramic concentric sphere material and has a spherical hollow cavity. The thickness of the cylinder is thick. A ceramic concentric sphere base substrate is closely wrapped inside the cylinder, and then the cylinder together with the ceramic concentric sphere base substrate is sintered at high temperature such that the ceramic cylinder green compact and the ceramic concentric sphere base substrate can contract together during high-temperature sintering and force exerted on the whole surface of a ceramic concentric sphere is balanced so as to avoid deformation and cracking of the ceramic concentric sphere during the high-temperature sintering.
Description
Technical field
The present invention relates to a kind of artwork and manufacture a kind of sintering method in field, particularly concentric ceramic ball.
Background technology
Concentric ceramic ball base substrate is alternately comprised of multilayer shelly sphere ceramic layer and multilayer shelly sphere sealing coat, removes and become pulverous sealing coat after high temperature burns till, and becomes the concentric ceramic ball that each layer can be freely movable.In the whole making processes of concentric ceramic ball, after having completed the making of homocentric sphere base substrate, how to make the concentric ceramic ball that burns out indeformable, do not ftracture and just become a technique difficult problem.The number of plies is more, bed thickness is thinner, spherical larger, when sintering, just more easily cause distortion and cracking.When the number of plies is a lot, because gap is between layers very little, slightly distortion, interlayer is just can not be freely movable, makes whole making unsuccessfully and all that has been achieved is spoiled.For making the whole spheroid of concentric ceramic ball stressed even in sintering process, during sintering, concentric ceramic ball base substrate should be placed in to box alms bowl and be embedded in aluminum oxide fine powder.But when high temperature sintering, concentric ceramic ball produces and shrinks, spheroid aluminum oxide powder around will subside and slide along with spheroid shrinks to produce, discontinuity around when this just still can make concentric ceramic ball sintering, this is very large for the such product difficulty of sintered ceramic homocentric sphere, is easy to cause spheroid distortion.
Summary of the invention
Goal of the invention: technical problem to be solved by this invention is the easy problem of cracking and distortion during for concentric ceramic ball sintering, and a kind of method that can not use box alms bowl sintered ceramic homocentric sphere is provided.
Technical scheme: for concentric ceramic ball easy problem of distortion and cracking when the high temperature sintering, except solving the problem of sealing coat and ceramic layer synchronous, also will make concentric ceramic ball base substrate produce while changing spheroid at high temperature sintering volume outside stressed even.When concentric ceramic ball base substrate is embedded in aluminum oxide fine powder, homocentric sphere base substrate integral body is stressed is balanced substantially, but when high temperature sintering homocentric sphere produces after volumetric shrinkage, between homocentric sphere and aluminum oxide powder, can produce space, aluminum oxide powder will be filled up these spaces, will produce and subside and slippage, at this moment the stressed unbalanced phenomena that occurs again of spheroid.Scheme provided by the invention is: after outermost one deck of concentric ceramic ball completes, then make one deck sealing coat in its outside.Then use the blank same with ceramic layer to make the right cylinder green compact with hemisphere inner chamber of two slit bamboo or chopped wood Hough shapes, the radius of its hemisphere is identical with last one deck sealing coat spherical radius, just in time concentric ceramic ball base substrate can be put into semisphere inner chamber, by another slit bamboo or chopped wood, the right cylinder green compact with semisphere inner chamber close again, at this moment by upper and lower two slit bamboo or chopped woods, the right cylinder green compact with hollow sphere cavity wrap up wherein concentric ceramic ball base substrate, and coordinate denser.Right cylinder ceramic green thickness is enough large, makes it substantially indeformable when high temperature sintering shrinks.Like this, right cylinder green compact just approach solid cylinder together with parcel concentric ceramic ball base substrate integral body wherein, accomplish slowly to heat up and slow cooling while needing only sintering like this, produce distortion in the time of just can avoiding sintering.After sintering completes, separate upper and lower two slit bamboo or chopped wood right cylinders, take out concentric ceramic ball, from the hollow part of ceramic layer, remove aluminum oxide fine powder, the sintering of concentric ceramic ball has accused.It is outermost one deck ceramic layer is not made to shelly but to thicken and to make two slit bamboo or chopped woods cylindrical that this method also can be considered, and stops distortion can conveniently take out again the effect of the inside homocentric sphere while playing sintering with the thicker ceramic layer of this one deck.
The present invention includes following steps:
Step 5, use the same method and make another slit bamboo or chopped wood with the hemispheric right cylinder of hollow, make it wrap another hemisphere of concentric ceramic ball base substrate, whole like this concentric ceramic ball base substrate wraps with the right cylinder of hollow sphere cavity with regard to being divided into two slit bamboo or chopped woods, can be substantially indeformable when cylindrical thickness will guarantee high temperature sintering;
Step 6, pack the right cylinder that includes concentric ceramic ball base substrate in High Temperature Furnaces Heating Apparatus sintering, while laying, below right cylinder, pad again the ceramic green sheet of putting the same material of a slice, the thickness of green sheet can not be too thin, and in upper and lower some aluminum oxide sand of Ge Sa, the impact on cylinder deflation when alleviating high temperature sintering;
Step 7, after sintering, by two slit bamboo or chopped wood right cylinders separately, takes out concentric ceramic ball, from hollow part, takes out the aluminum oxide fine powder that has become loose, and the sintering of concentric ceramic ball has accused.
From said process, we can find out, wrap concentric ceramic ball base substrate carry out sintering after using material the same as ceramic layer to make two slit bamboo or chopped woods to close up with the right cylinder of hollow sphere cavity, just can burn out the substantially indeformable and convenient concentric ceramic ball taking out.
Beneficial effect: use method of the present invention, can facilitate sintering go out indeformable indehiscent concentric ceramic ball and easily take out.
Accompanying drawing explanation
Fig. 1, for concentric ceramic ball base substrate completes the situation after last one deck sealing coat in mould, in figure, 1 is mould, and Dark grey district 2 is homocentric sphere green ceramic floor, and light gray zones 3 is sealing coat;
Fig. 2, for making the cylindrical base substrate of a slit bamboo or chopped wood in homocentric sphere base substrate episphere district by ceramic layer green material, wraps the episphere part of concentric ceramic ball base substrate, 1 mould in figure, and 2 is homocentric sphere base substrate, and 3 is oxide isolation layer aluminium fine powder, and 4 is cylindrical ceramic base substrate;
Fig. 3, for the homocentric sphere base substrate in Fig. 2 and mould reversal upset are placed, takes away mould 1, right cylinder ring surface is removed to skim and processes pit or groove, then process in the above one deck sealing coat.In figure, 2 is homocentric sphere base substrate, and 3 is oxide isolation layer aluminium fine powder, and 4 is right cylinder green compact;
Fig. 4, for making the situation after the cylindrical base substrate of another slit bamboo or chopped wood.Figure Oxford gray district 2 is homocentric sphere base substrate, and light gray zones 3 is oxide isolation layer aluminium fine powder, and 4 is upper and lower two slit bamboo or chopped wood right cylinder green compact;
Fig. 5, is the concentric ceramic ball of sintering after completing, and Dark grey district is pottery, and white area is the hollow part of concentric ceramic ball interlayer transcribed spacer and every one deck.
Embodiment:
As described in Figure, the invention discloses a kind of use two slit bamboo or chopped woods with the right cylinder ceramic green of hollow sphere cavity, parcel concentric ceramic ball base substrate carrys out the method for sintered ceramic homocentric sphere, comprises the following steps:
Step 5, use the same method and make another slit bamboo or chopped wood right cylinder, make it wrap another hemisphere of concentric ceramic ball base substrate, whole like this concentric ceramic ball base substrate is just divided into two slit bamboo or chopped woods and wraps with the right cylinder 4 of hollow sphere cavity, can be substantially indeformable when the thickness of right cylinder 4 will guarantee high temperature sintering;
Step 6, pack the right cylinder 4 that includes concentric ceramic ball base substrate in High Temperature Furnaces Heating Apparatus sintering, while laying, below right cylinder, pad again the ceramic green sheet of putting the same material of a slice, the thickness of green sheet can not be too thin, and at upper and lower some aluminum oxide fine sands of Ge Sa, the impact of right cylinder 4 being shunk when alleviating high temperature sintering;
Step 7, after sintering, by two slit bamboo or chopped wood right cylinders 4 separately, takes out concentric ceramic ball, from hollow part, takes out the aluminum oxide fine powder 3 that has become loose, and the sintering of concentric ceramic ball has accused.
From above-mentioned step, can see, after using material the same as ceramic layer to make two slit bamboo or chopped woods to close up, with the right cylinder of hollow sphere cavity, wrap concentric ceramic ball base substrate and carry out sintering, just can go out indeformable indehiscent concentric ceramic ball by sintering.
The invention provides a kind of use makes upper and lower two slit bamboo or chopped woods with the green compact of the same material of concentric ceramic ball and with the right cylinder of hollow sphere cavity, wraps concentric ceramic ball base substrate and carry out high temperature sintering and with sintering, go out the method for concentric ceramic ball; method and the approach of this technical scheme of specific implementation are a lot; the above is only the preferred embodiments of the invention; should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. for a method for sintered ceramic homocentric sphere, its step is as follows:
Step 1, after carrying out the ceramic layer of last one deck concentric ceramic ball, then makes one deck sealing coat on its surface;
Step 2, still utilize the mould of locating concentric ceramic ball base substrate while making sealing coat, concentric ceramic ball lower semisphere part is in mould, expose episphere part, with the materials and methods of making ceramic layer, in the outside of sealing coat episphere, produce a right cylinder, allow right cylinder wrap densely the episphere part of concentric ceramic ball base substrate;
Step 3, overturns ready-made right cylinder together with being wrapped in the inside concentric ceramic ball base substrate and mould, the mould of taking away top after laying steadily exposes another hemisphere and cylindrical planar annular;
Step 4, removes skim by cylindrical planar annular, then makes several pits or groove thereon, then on planar annular, makes one deck sealing coat;
Step 5, use the same method and make another slit bamboo or chopped wood with the hemispheric right cylinder of hollow, make it wrap another hemisphere of concentric ceramic ball base substrate, whole like this concentric ceramic ball base substrate wraps with the right cylinder of hollow sphere cavity with regard to being divided into two slit bamboo or chopped woods, can be substantially indeformable when cylindrical thickness will guarantee high temperature sintering;
Step 6, pack the right cylinder that includes concentric ceramic ball base substrate in High Temperature Furnaces Heating Apparatus sintering, while laying, below right cylinder, pad again the ceramic green sheet of putting the same material of a slice, the thickness of green sheet can not be too thin, and in upper and lower some aluminum oxide sand of Ge Sa, the impact on cylinder deflation when alleviating high temperature sintering;
Step 7, after sintering, by two slit bamboo or chopped wood right cylinders separately, takes out concentric ceramic ball, from hollow part, takes out the aluminum oxide fine powder that has become loose, and the sintering of concentric ceramic ball has accused.
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CN201110187247.5A CN102850058B (en) | 2011-06-30 | 2011-06-30 | Sintering method of ceramic concentric sphere |
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CN201110187247.5A CN102850058B (en) | 2011-06-30 | 2011-06-30 | Sintering method of ceramic concentric sphere |
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CN102850058B true CN102850058B (en) | 2014-03-26 |
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CN1126132A (en) * | 1995-01-06 | 1996-07-10 | 侯伟华 | Isostatic pressing method for ceramic powder |
MX2007009374A (en) * | 2005-02-04 | 2007-11-15 | Oxane Materials Inc | A composition and method for making a proppant. |
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