A kind of two-piece-dress ceramic bulb shell and preparation method thereof
Technical field
The invention belongs to electric source material preparing technical field, relate in particular to a kind of two-piece-dress ceramic bulb shell and preparation method thereof.
Background technology
Two-piece-dress cell-shell generally adopts the mode of interference fit to achieve a butt joint at present, as shown in Figure 1, first distinguish two base substrates of moulding, the concaveconvex structure that has coupling at the butted part of two base substrates, the base substrate of two kinds of different structures is burned in advance under different temperatures according to shrinkage, more pre-two burned biscuits are docked, then carries out high temperature sintering, butted part combines by the mode of interference fit, realizes air-tightness docking.
There is in the last few years the method that another two-piece-dress cell-shell realization connects, it is exactly a kind of ceramic body that contains more jointing material of moulding, the shape of two base substrates is identical, under green state to two ceramic bodies being combined in fixture after the faying face thermoplastic of ceramic body, carry out again binder removal, sintering, realize the air-tightness docking of ceramic bulb shell.
Two-piece-dress cell-shell adopts the mode of interference fit to dock by shrinkage difference in sintering process and realizes, therefore need two kinds of shrinkage differences of moulding and the different base substrate of interface structure, then also to select different calcined temperatures to carry out pre-burning, process more complicated, control difficulty larger, the cell-shell that interference fit connects in addition need increase wall thickness, so also can affect cell-shell light transmittance, and in each assembling and sintering step, the defects such as the dislocation of ceramic bulb shell assembly or adhesion and air-tightness may occur.
The method that adopts the mode heating to dock two-piece-dress cell-shell is by a pair of base substrate that contains a large amount of jointing materials of moulding, by heating binding site, make base substrate fusing, two assemblies are combined and realized under external force, therefore in follow-up technique, be difficult to drain a large amount of bond materials in base substrate, it is the fatal problem that affects performance that impurity is contained in transparent alumina ceramics cell-shell inside, base substrate is heated and conducts whole deliquescing in addition, also add and will apply External Force Acting, in docking operation, be easy to occur the situation of blank deformation.
Summary of the invention
For the shortcoming of prior art, the object of this invention is to provide a kind of technique simple, docking mode is reliable, and base substrate docking outward appearance is without the manufacture method of the two-piece-dress ceramic bulb shell of distortion, dislocation;
In addition, the present invention also provides the ceramic bulb shell that above-mentioned manufacture method obtains.
For achieving the above object, technical scheme of the present invention is: a kind of manufacture method of two-piece-dress ceramic bulb shell, and it comprises the following steps:
A, the ceramic bulb shell base substrate that a pair of shape of moulding is identical, base substrate is comprised of capillary and cavity;
B, at faying face moulding one circle of cavity in conjunction with circle;
C, the thin-layer sizing agent at combination circle surface printing one deck of cell-shell base substrate to be docked for boning;
D, by Special tooling clamp, two cell-shell base substrates are positioned, make to be bonded together in conjunction with the surperficial slurry of circle;
E, the cell-shell of connection is dried, after slurry drying, takes out the base substrate being bonded together; Through high temperature sintering, be finally shaped to two-piece-dress ceramic bulb shell.
In steps d, described fixture comprise diameter than the thin draw point of capillary inner diameter and with the base of ceramic body cambered surface coupling; By print slurry a base substrate capillary down, be fixed in the fixture designing, the cavity of getting again the base substrate that another one is printed on slurry inserts in draw point down, by two base substrates accurately being located through the draw point of capillary endoporus, and under cell-shell base substrate self gravitation or external force, depress and make to be bonded together in conjunction with the surperficial slurry of circle.
In step b, the height of described combination circle evagination part is 0.5~1.0mm.In step c, adopt film printing or transfer-print technology at combination circle surface printing one deck of cell-shell base substrate to be docked the thin-layer sizing agent for boning, slurry thickness is 0.03~0.05mm.
In step c, the main component of thin-layer sizing agent is the alumina powder identical with cell-shell base substrate composition, also add 2 ~ 5% glycerine, 3 ~ 6% terpinols, 1 ~ 4% dioctyl phthalate, 0.5 ~ 2% phthalic acid didecyl ester, 1 ~ 3% epoxy resin, 0.1 ~ 0.5% polyamide wax and 0.1 ~ 0.5% rilanit special, and adopt slurry technology of preparing to be prepared into meet the slurry of the viscosity 30000 ~ 40000mPa * S of film printing needs.
In step e, 50~80 ℃ of heat drying temperature, the time is 10~30min; Or be placed in air and be dried, the time is 100~150min.
In step a, cavity is semielliptical type, dome-type or half cast; Cell-shell base substrate is by dry-pressing or isostatic compaction.
Meanwhile, the present invention also provides a kind of two-piece-dress ceramic bulb shell, comprises two cavitys and is located at respectively the capillary on cavity end, wherein, on the faying face of two cavitys, be equipped with in conjunction with circle, and be provided with thin-layer sizing agent in conjunction with circle, two cavitys are bonded together by thin-layer sizing agent.
The height of described combination circle evagination part is 0.5~1.0mm; Described thin-layer sizing agent thickness is 0.03~0.05mm; Described cavity is semielliptical type, dome-type or half cast.
Compared with prior art, beneficial effect of the present invention is,
1. cell-shell base substrate of the present invention, by dry-pressing or isostatic compaction, only contains a small amount of bonding agent, just with the organic substance draining in base substrate;
2. the cavity faying face of cell-shell base substrate has increased by a circle in conjunction with circle, has increased the bond area of bonding, has guaranteed Cohesion reliability;
3. thin-layer sizing agent main component is identical with cell-shell composition, two cell-shell base substrates can well be connected together, due to when bonding base substrate or dry-pressing or the green state that waits static pressure to go out, without any heating or through pre-burning process, there will not be base substrate because of the deformation heating or pre-burning brings;
4. while boning, adopt fixture location, two base substrates are fixed on same draw point, and axiality is guaranteed, and there will not be the situation of docking dislocation.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art two-piece-dress cell-shell interference fit;
Fig. 2 is the structural representation of ceramic bulb shell base substrate of the present invention;
Fig. 3 is the enlarged diagram of A part in Fig. 2;
Fig. 4 is the structural representation of fixture;
Fig. 5 is the structural representation of ceramic bulb shell base substrate docking;
Fig. 6 is the structural representation of a plurality of fixture stations;
Fig. 7 is the structural representation of the ceramic bulb shell after moulding;
When Fig. 8 is printing thin-layer sizing agent, bad body is placed station schematic diagram.
Embodiment
As shown in Figure 1, the invention discloses a kind of forming method of two-piece-dress ceramic bulb shell, it comprises the following steps:
Step 1, adopt dry-pressing or etc. the identical ceramic bulb shell base substrate of a pair of shape of method moulding of static pressure, wherein the bonding agent material content in base substrate is lower than 1%; This base substrate is comprised of the cavity 2 of one section of capillary 1 and half spheroid shape, dome-type or half cast.
Step 2, in order to increase bond area, in the faying face moulding of cavity one circle in conjunction with circle 3, as Fig. 3 shows: make the good looking appearance of the ceramic bulb shell after docking, should not be too large in conjunction with enclosing size, evagination Partial Height is 0.5~1.0mm, and structure present situation as shown in Figure 2,3.
Step 3, adopt film printing or transfer-print technology at combination circle surface printing one deck of cell-shell base substrate to be docked the thin-layer sizing agent for boning, slurry thickness is generally no more than 0.03~0.05mm.
Wherein, the main component of thin-layer sizing agent is the alumina powder identical with cell-shell base substrate composition, also add 2 ~ 5% glycerine, 3 ~ 6% terpinols, 1 ~ 4% dioctyl phthalate, 0.5 ~ 2% phthalic acid didecyl ester, 1 ~ 3% epoxy resin, 0.1 ~ 0.5% polyamide wax and 0.1 ~ 0.5% rilanit special, and adopt slurry technology of preparing to be prepared into meet the slurry of the viscosity 30000 ~ 40000mPa * S of film printing needs.
Step 4, by print slurry a base substrate capillary down, be fixed in the fixture designing, described fixture comprise diameter than the thin draw point 4 of capillary inner diameter and with the base 5 of ceramic body cambered surface coupling, the cavity of getting again the base substrate that another one is printed on slurry inserts in draw point down, by two base substrates accurately being located through the draw point of capillary endoporus, because pulp layer is very thin, under cell-shell base substrate self gravitation or external force, depress and make to be bonded together in conjunction with the surperficial slurry of circle, as shown in Figures 4 and 5.
Step 5, the cell-shell of connection is put in drying box dry together with fixture again, after slurry drying, takes out the base substrate being bonded together.
In above-mentioned steps, for handled easily and high efficiency production, can be on one flat plate according to a lot of this fixture stations of physical dimension processing of cell-shell base substrate, as Fig. 6 shows, after waiting the cell-shell of all stations all to bond, whole move in drying box dry.
Slurry curing temperature, the time is adjustable, can dry by normal temperature, also can heating, drying.50~80 ℃ of heat drying temperature, the time is 10~30min; If be placed in air, be dried, the time is 100~150min.
The cell-shell base substrate having bondd is owing to only containing a small amount of bonding agent, after the binder removal of short period, just can enter sintering furnace sintering, make ceramic bulb shell reach solid density, the hexagonal structure that inner grain growth is certain size, finally becomes a two-piece-dress translucent alumina ceramics cell-shell, and cell-shell discharge cavity is spheroid shape, ball-type or cast, the central part of discharge cavity protrudes a circle, but do not affect integral light-transmitting performance, respectively there is one section of capillary at discharge cavity two ends, as shown in Figure 7.
Below in conjunction with embodiment, the present invention is conducted further description.
Embodiment 1, make the spheroid shape two-piece-dress ceramic bulb shell of a collection of 150W
1, use as requested mist projection granulating the static pressure such as high purity aluminium oxide employing a collection of cell-shell base substrate of method moulding.
2, configure a collection of slurry, main component is high-purity alumina powder, add 3% glycerine, 4.5% terpinol, 2% dioctyl phthalate, 1% phthalic acid didecyl ester, 2% epoxy resin, 0.3% polyamide wax, 0.25% rilanit special, testing size viscosity is at 32000mPa * S, and the slurry sealing preparing is kept at uniform rotation on the turntable in insulating box.
3, by the base substrate capillary of forming down, cavity puts in conjunction with circle direction upward the fixture showing as Fig. 8, and employing film printing technology is the surface printing last layer grout bed of material in conjunction with circle at base substrate cavity, the about 0.04mm of testing size layer thickness.
4, the base substrate that prints slurry is got to half and from the fixture of Fig. 8, transferred in the special fixture of Fig. 6, remaining general base substrate fixedly docks by the steel core pin through endoporus capillaceous with the base substrate of transferring in Fig. 6 fixture one by one.
5, use base substrate all to connecting in rear air, to place 10min.
6, standing time to after fixture is transferred in drying box dry together with base substrate, Temperature Setting is at 65 ℃, time 20min takes out the to be heated and high temperature sinterings such as placement after dry.
7, by above method, prepare after the base substrate that a collection of bonding is good, these are bondd a collection of concentrate to put in air furnace after 420 ℃ of insulations are got rid of bonding agent less in base substrate in 2.5 hours enter again 1800 ℃ of high temperature sinterings in hydrogen furnace, the cell-shell that makes to have bondd reaches into the solid density of porcelain, become the ceramic bulb shell of translucent two-piece-dress structure, discharge cavity is spheroid shape, the central part of discharge cavity protrudes a circle, but does not affect integral light-transmitting performance, and respectively there is one section of capillary at discharge cavity two ends.