CN103551570B - The tantalum capacitor manufacture method of tantalum powder mobility is improved in a kind of preparation process - Google Patents
The tantalum capacitor manufacture method of tantalum powder mobility is improved in a kind of preparation process Download PDFInfo
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- CN103551570B CN103551570B CN201310493333.8A CN201310493333A CN103551570B CN 103551570 B CN103551570 B CN 103551570B CN 201310493333 A CN201310493333 A CN 201310493333A CN 103551570 B CN103551570 B CN 103551570B
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Abstract
The invention discloses in a kind of preparation process the tantalum capacitor manufacture method improving tantalum powder mobility, it comprises following steps: the preparation of (1), aqueous binder solution; (2), mixed powder; (3), spraying dry: tantalum powder mixed liquor is poured in the feed appliance of spray drying granulation machine, obtains the tantalum powder of almost spherical through secondary granulation; (4), compressing; (5), remove adhesive: tantalum anode block boils and washes 2 ~ 4 hours in the deionized water of 40 ~ 60 DEG C, repeated washing 2 ~ 3 times, then take out and dry 30 ~ 60 minutes in the baking oven of 80 ~ 90 DEG C.The invention has the beneficial effects as follows: by using water-soluble binder, by spraying dry secondary granulation, improve the mobility of tantalum powder in preparation process, high specific capacitance tantalum powder is made to cross pressed density in title at tantalum formation of lots even, meet the processing request that tantalum block weight uniformity is consistent, instead of the organic solvent used at present, decrease industrial pollution, be applicable to industrialized production.
Description
Technical field
The present invention relates in a kind of preparation process the tantalum capacitor manufacture method improving tantalum powder mobility, belong to tantalum capacitor preparing technical field.
Background technology
Along with electronic system product is miniaturized, slimming future development, complete machine producer also requires tantalum capacitor small size, Large Copacity.The bulking value of raw material tantalum powder that tantalum capacitor manufactures is also more and more higher, and the diameter of tantalum powder particles becomes more and more less, though still can not meet the requirement of tantalum capacitor manufacturer through the mobility of the dough PROCESS FOR TREATMENT tantalum powder of Tan Fen manufacturer.For this reason numerous tantalum capacitor manufacturers has carried out a lot of research to the blending processes of powders of tantalum capacitor and the method adding adhesive.As taked the adhesives such as organic solvent dissolution stearic acid, camphor, acrylic acid by stirring the mobility improving tantalum powder, when having certain effect for tantalum powder specific volume at the tantalum powder of 50000 below μ F.V/g but be greater than 70000 μ F.V/g when tantalum powder specific volume, the improvement of mobility is just not obvious, shaping difficulty strengthens, and the grain weight deviation of tantalum block strengthens the control difficulty and the production cost that add production process simultaneously.
Summary of the invention
The object of the present invention is to provide in a kind of preparation process the tantalum capacitor manufacture method improving tantalum powder mobility, the deficiencies in the prior art can be overcome, improve the mobility of tantalum powder, make high specific capacitance tantalum powder cross pressed density in title at tantalum formation of lots even, meet the processing request that tantalum block weight uniformity is consistent.
The object of the invention is to be achieved through the following technical solutions: the tantalum capacitor manufacture method improving tantalum powder mobility in a kind of preparation process, it comprises following steps:
(1), the preparation of aqueous binder solution: glass container put into by the polyethylene glycol taking tantalum grain weight amount 5 ~ 15%; add deionized water magnetic stirrer 10 ~ 15 minutes; allow polyethylene glycol fully dissolve, obtain the polyglycol solution that concentration is 2 ~ 8%;
(2), mixed powder: tantalum powder is put into polyglycol solution, stirs and add deionized water with stainless steel bar, stir 10 ~ 15 minutes, allow tantalum powder be uniformly dispersed in the solution, such tantalum powder particles skin can form the uniform adhesive phase of one deck;
(3), spraying dry: pour in the feed appliance of spray drying granulation machine by tantalum powder mixed liquor, feeding pressure 5 ~ 10Mpa, air heat temperature 80 ~ 105 DEG C, obtain the tantalum powder of almost spherical through secondary granulation, tantalum powder mobility reaches 30 ~ 45s/50g;
(4), compressing: the tantalum powder after spraying dry to be put into mould pressed-powder anode block continuously;
(5), remove adhesive: tantalum anode block boils and washes 2 ~ 4 hours in the deionized water of 40 ~ 60 DEG C, repeated washing 2 ~ 3 times, then take out and dry 30 ~ 60 minutes in the baking oven of 80 ~ 90 DEG C.
The molecular weight of described polyethylene glycol is 800 ~ 3000.
Beneficial effect of the present invention is: by using water-soluble binder, by spraying dry secondary granulation, improve the mobility of tantalum powder in preparation process, high specific capacitance tantalum powder is made to cross pressed density in title at tantalum formation of lots even, meet the processing request that tantalum block weight uniformity is consistent, instead of the organic solvent used at present, decrease industrial pollution, be applicable to industrialized production.
Detailed description of the invention
Technical scheme of the present invention is further described below in conjunction with embodiment, but described in claimed scope is not limited to.
Embodiment 1
Improve a tantalum capacitor manufacture method for tantalum powder mobility in preparation process, with by CV value be the compressing grain weight of tantalum powder of 150000 μ F.V/g for 8mg, size is the tantalum block of 0.75 × 1.0 × 1.4mm is example, and it comprises following steps:
(1), the preparation of aqueous binder solution: take tantalum powder 100g; take tantalum grain weight amount 7%(and 7g) polyethylene glycol put into glass container; add deionized water magnetic stirrer 10 minutes, allow polyethylene glycol fully dissolve, obtain the polyglycol solution that concentration is 5%;
(2), mixed powder: tantalum powder is put into polyglycol solution, stirs and add deionized water with stainless steel bar, stir 10 minutes, allow tantalum powder be uniformly dispersed in the solution, such tantalum powder particles skin can form the uniform adhesive phase of one deck;
(3), spraying dry: tantalum powder mixed liquor is poured in the feed appliance of spray drying granulation machine, feeding pressure 8Mpa, air heat temperature 90 DEG C, obtain the tantalum powder of almost spherical through secondary granulation;
(4), compressing: the tantalum powder after spraying dry is put into mould pressed-powder anode block continuously, mould is of a size of 0.75mmx1.0mm, regulates compacting height 1.4mm;
(5), remove adhesive: tantalum anode block boils and washes 3 hours in the deionized water of 50 DEG C, repeated washing 2 times, then take out and dry 30 minutes in the baking oven of 90 DEG C.
The molecular weight of described polyethylene glycol is 1000.
Embodiment 2
Improve a tantalum capacitor manufacture method for tantalum powder mobility in preparation process, it comprises following steps:
(1), the preparation of aqueous binder solution: glass container put into by the polyethylene glycol taking tantalum grain weight amount 5 ~ 15%; add deionized water magnetic stirrer 10 ~ 15 minutes; allow polyethylene glycol fully dissolve, obtain the polyglycol solution that concentration is 2 ~ 8%;
(2), mixed powder: tantalum powder is put into polyglycol solution, stirs and add deionized water with stainless steel bar, stir 10 ~ 15 minutes, allow tantalum powder be uniformly dispersed in the solution, such tantalum powder particles skin can form the uniform adhesive phase of one deck;
(3), spraying dry: tantalum powder mixed liquor is poured in the feed appliance of spray drying granulation machine, feeding pressure 5 ~ 10Mpa, air heat temperature 80 ~ 105 DEG C, obtain the tantalum powder of almost spherical through secondary granulation;
(4), compressing: the tantalum powder after spraying dry to be put into mould pressed-powder anode block continuously;
(5), remove adhesive: tantalum anode block boils and washes 2 ~ 4 hours in the deionized water of 40 ~ 60 DEG C, repeated washing 2 ~ 3 times, then take out and dry 30 ~ 60 minutes in the baking oven of 80 ~ 90 DEG C.
The molecular weight of described polyethylene glycol is 800 ~ 3000.
Embodiment 3
Improve a tantalum capacitor manufacture method for tantalum powder mobility in preparation process, it comprises following steps:
(1), the preparation of aqueous binder solution: glass container put into by the polyethylene glycol taking tantalum grain weight amount 5 ~ 15%; add deionized water magnetic stirrer 10 ~ 15 minutes; allow polyethylene glycol fully dissolve, obtain the polyglycol solution that concentration is 2 ~ 8%;
(2), mixed powder: tantalum powder is put into polyglycol solution, stirs and add deionized water with stainless steel bar, stir 10 ~ 15 minutes, allow tantalum powder be uniformly dispersed in the solution, such tantalum powder particles skin can form the uniform adhesive phase of one deck;
(3), spraying dry: tantalum powder mixed liquor is poured in the feed appliance of spray drying granulation machine, feeding pressure 5 ~ 10Mpa, air heat temperature 80 ~ 105 DEG C, obtain the tantalum powder of almost spherical through secondary granulation;
(4), compressing: the tantalum powder after spraying dry to be put into mould pressed-powder anode block continuously;
(5), remove adhesive: tantalum anode block boils and washes 2 ~ 4 hours in the deionized water of 40 ~ 60 DEG C, repeated washing 2 ~ 3 times, then take out and dry 30 ~ 60 minutes in the baking oven of 80 ~ 90 DEG C.
The molecular weight of described polyethylene glycol is 800 ~ 3000.
Embodiment 4
Improve a tantalum capacitor manufacture method for tantalum powder mobility in preparation process, it comprises following steps:
(1), the preparation of aqueous binder solution: glass container put into by the polyethylene glycol taking tantalum grain weight amount 5 ~ 15%; add deionized water magnetic stirrer 10 ~ 15 minutes; allow polyethylene glycol fully dissolve, obtain the polyglycol solution that concentration is 2 ~ 8%;
(2), mixed powder: tantalum powder is put into polyglycol solution, stirs and add deionized water with stainless steel bar, stir 10 ~ 15 minutes, allow tantalum powder be uniformly dispersed in the solution, such tantalum powder particles skin can form the uniform adhesive phase of one deck;
(3), spraying dry: tantalum powder mixed liquor is poured in the feed appliance of spray drying granulation machine, feeding pressure 5 ~ 10Mpa, air heat temperature 80 ~ 105 DEG C, obtain the tantalum powder of almost spherical through secondary granulation;
(4), compressing: the tantalum powder after spraying dry to be put into mould pressed-powder anode block continuously;
(5), remove adhesive: tantalum anode block boils and washes 2 ~ 4 hours in the deionized water of 40 ~ 60 DEG C, repeated washing 2 ~ 3 times, then take out and dry 30 ~ 60 minutes in the baking oven of 80 ~ 90 DEG C.
The molecular weight of described polyethylene glycol is 800 ~ 3000.
Embodiment 5
Improve a tantalum capacitor manufacture method for tantalum powder mobility in preparation process, it comprises following steps:
(1), the preparation of aqueous binder solution: glass container put into by the polyethylene glycol taking tantalum grain weight amount 5 ~ 15%; add deionized water magnetic stirrer 10 ~ 15 minutes; allow polyethylene glycol fully dissolve, obtain the polyglycol solution that concentration is 2 ~ 8%;
(2), mixed powder: tantalum powder is put into polyglycol solution, stirs and add deionized water with stainless steel bar, stir 10 ~ 15 minutes, allow tantalum powder be uniformly dispersed in the solution, such tantalum powder particles skin can form the uniform adhesive phase of one deck;
(3), spraying dry: tantalum powder mixed liquor is poured in the feed appliance of spray drying granulation machine, feeding pressure 5 ~ 10Mpa, air heat temperature 80 ~ 105 DEG C, obtain the tantalum powder of almost spherical through secondary granulation;
(4), compressing: the tantalum powder after spraying dry to be put into mould pressed-powder anode block continuously;
(5), remove adhesive: tantalum anode block boils and washes 2 ~ 4 hours in the deionized water of 40 ~ 60 DEG C, repeated washing 2 ~ 3 times, then take out and dry 30 ~ 60 minutes in the baking oven of 80 ~ 90 DEG C.
The molecular weight of described polyethylene glycol is 800 ~ 3000.
Comparative example 1
With the tantalum powder 100g that CV value is 150000 μ F.V/g, the stearic acid conventionally dissolving 7g with alcohol as adhesive add stir in tantalum powder after measure mobility, and to be pressed into weight be 8mg size is 0.75 × 1.0 × 1.4mm
3tantalum anode block, removes adhesive through vacuum pre-burning in 550 DEG C/20 minutes and obtains.
The mobility of tantalum powder and the weight of tantalum block in preparation process measured by random 5 samples of sampling from embodiment 1 and comparative example 1, and it the results are shown in Table 1.
The comparative analysis of table 1 embodiment 1 and comparative example 1
Comparative example 2
With the tantalum powder 100g that CV value is 100000 μ F.V/g, the stearic acid dissolving 7g by prior art alcohol as adhesive add stir in tantalum powder after measure mobility, and to be pressed into weight be 8mg size is 0.75 × 1.0 × 1.4mm
3tantalum anode block.Remove adhesive through vacuum pre-burning in 550 DEG C/20 minutes to obtain.
Comparative example 3
With the tantalum powder 100g that CV value is 70000 μ F.V/g, the stearic acid dissolving 7g according to existing alcohol as adhesive add stir in tantalum powder after measure mobility, and compressing weight is 8mg size is 0.75 × 1.0 × 1.4mm
3tantalum anode block.Remove adhesive through vacuum pre-burning in 550 DEG C/20 minutes to obtain.
At random from embodiment 1 and comparative example 2, comparative example 3, the mobility of tantalum powder and the weight of tantalum block in preparation process measured by sampling 5 samples, and it the results are shown in Table 2.
The comparative analysis of table 2 embodiment 1 and comparative example 2, comparative example 3
Visible, in tantalum capacitor manufacture process, the grain weight uniformity of tantalum block will directly affect the Capacity uniformity of tantalum electrolytic capacitor, and in tantalum block, the Density Distribution of tantalum powder will affect many unit for electrical property parameters of tantalum capacitor.Manufacture high-quality tantalum capacitor must from tantalum anode block compressing, and the improvement of the mobility of tantalum powder is fully protected making the quality of tantalum anode block.As table 1 and table 2, no matter under the prerequisite of identical Fabrication of High Specific Capacitance value or different bulking values, adopt the tantalum anode block of the present invention's production owing to using water miscible adhesive, adhesive is made to be evenly distributed on each tantalum powder particles surface, by spraying dry secondary granulation, make compressing front tantalum powder particles be similar to spherical, the liquidity scale improving tantalum powder is greater than more than 11%, and removes the consumption of adhesive economize energy and production cycle by the method for washing.The grain weight deviation of tantalum block controls completely within ± 3%.
Claims (1)
1. improve a tantalum capacitor manufacture method for tantalum powder mobility in preparation process, it is characterized in that: by using water-soluble binder and spraying dry secondary granulation, improve the mobility of tantalum powder in preparation process, it comprises following steps:
(1), the preparation of aqueous binder solution: glass container put into by the polyethylene glycol taking tantalum grain weight amount 5 ~ 15%, add deionized water magnetic stirrer 10 ~ 15 minutes, allow polyethylene glycol fully dissolve, obtain the polyglycol solution that concentration is 2 ~ 8%;
(2), mixed powder: tantalum powder is put into polyglycol solution, stirs and add deionized water with stainless steel bar, stir 10 ~ 15 minutes, allow tantalum powder be uniformly dispersed in the solution, such tantalum powder particles skin can form the uniform adhesive phase of one deck;
(3), spraying dry: tantalum powder mixed liquor is poured in the feed appliance of spray drying granulation machine, feeding pressure 5 ~ 10Mpa, air heat temperature 80 ~ 105 DEG C, obtain the tantalum powder of almost spherical through secondary granulation;
(4), compressing: the tantalum powder after spraying dry to be put into mould pressed-powder anode block continuously;
(5), remove adhesive: tantalum anode block boils and washes 2 ~ 4 hours in the deionized water of 40 ~ 60 DEG C, repeated washing 2 ~ 3 times, then take out and dry 30 ~ 60 minutes in the baking oven of 80 ~ 90 DEG C;
The molecular weight of described polyethylene glycol is 800 ~ 30000.
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| CN106270482B (en) * | 2016-08-11 | 2019-01-04 | 中国振华（集团）新云电子元器件有限责任公司 | Tantalum powder performance improvement method and the anode block of tantalum capacitor of the tantalum powder and the tantalum powder preparation |
| CN106964772B (en) * | 2017-05-18 | 2019-05-28 | 江门富祥电子材料有限公司 | A kind of preparation method of the controllable tantalum powder in aperture |
| CN110434325A (en) * | 2019-07-31 | 2019-11-12 | 中国振华（集团）新云电子元器件有限责任公司 | A method of it reducing tantalum capacitor and is sintered tantalum block carbon, oxygen content |
| CN115570127B (en) * | 2022-10-11 | 2023-07-21 | 江门富祥电子材料有限公司 | Preparation method of tantalum powder |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1243464A (en) * | 1997-01-13 | 2000-02-02 | Avx有限公司 | Binder removal method |
| CN1591721A (en) * | 2003-08-29 | 2005-03-09 | Nec东金株式会社 | Valve metal powder and solid electrolytic capacitor using the same |
| CN102420051A (en) * | 2010-09-27 | 2012-04-18 | Avx公司 | Solid electrolytic capacitor with folded anode lead frame |
| CN102768906A (en) * | 2012-08-09 | 2012-11-07 | 中国振华（集团）新云电子元器件有限责任公司 | Method for manufacturing tantalum capacitor anode block through mixed powder in thermal field environment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2675820B2 (en) * | 1988-07-22 | 1997-11-12 | 昭和キャボットスーパーメタル株式会社 | Tantalum powder granulation |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1243464A (en) * | 1997-01-13 | 2000-02-02 | Avx有限公司 | Binder removal method |
| CN1591721A (en) * | 2003-08-29 | 2005-03-09 | Nec东金株式会社 | Valve metal powder and solid electrolytic capacitor using the same |
| CN102420051A (en) * | 2010-09-27 | 2012-04-18 | Avx公司 | Solid electrolytic capacitor with folded anode lead frame |
| CN102768906A (en) * | 2012-08-09 | 2012-11-07 | 中国振华（集团）新云电子元器件有限责任公司 | Method for manufacturing tantalum capacitor anode block through mixed powder in thermal field environment |
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