WO2001087500A2 - Coating method - Google Patents
Coating method Download PDFInfo
- Publication number
- WO2001087500A2 WO2001087500A2 PCT/DE2001/001523 DE0101523W WO0187500A2 WO 2001087500 A2 WO2001087500 A2 WO 2001087500A2 DE 0101523 W DE0101523 W DE 0101523W WO 0187500 A2 WO0187500 A2 WO 0187500A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coating
- layer
- coated
- coating fluid
- cavities
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0493—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases using vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
Definitions
- the invention relates to a method for coating according to the preamble of claim 1.
- coating materials are applied for refinement, for protection or as part of a further processing process.
- substrates which are used to hold, hold and / or connect circuit arrangements - for example in the case of semiconductor modules on so-called DCB substrates - on the resulting structure, which consists of a layer of a carrier material and a contact material can be constructed, for example in the form of copper on a ceramic carrier, to provide an additional layer of a coating material at least partially on the free surfaces, for example in order to effect necessary electrical insulation of different conductive components from one another at certain edge regions of conductors.
- a fundamental problem with such a coating is that the material to be coated, due to its previous exposure to a certain ambient atmosphere, has certain atmospheric fractions bound to its surface by physisorption and / or by chemisorption. In particular, certain unevenness, roughness and / or cavities are always present on the surface of the material to be coated, where corresponding atmospheric fractions or other materials can preferably also accumulate as foreign materials in the manner described.
- an insulation coating for example applied to a DCB substrate
- the invention has for its object to provide a method for coating, in which the influence of foreign materials on the coating layer can be avoided particularly reliably with little effort.
- a layer of at least one coating fluid which contains at least one coating material and / or a starting, auxiliary and / or additive therefor is formed on at least part of the surface of the material to be coated , Furthermore, at least a region of the material to be coated is subjected to an atmosphere of low pressure, preferably with a vacuum, in order to remove, in particular at least partially physisorbed and / or chemisorbed, foreign materials or the like from the surface of the material and / or regions, in particular cavities , at least partially remove from it.
- the method according to the invention for coating an essentially solid material provides that exposure to an atmosphere of low pressure, in particular a vacuum, before the layer of coating fluid is formed on the material to be coated.
- the low pressure in particular the vacuum
- the foreign materials are already at least partially covered by the coating fluid and thus virtually protected.
- a much larger proportion of the deposited foreign materials are detached from the adhesion areas of the material to be coated before the coating fluid is applied, as a result of which contamination of the coating fluid and in particular of the coating material with the foreign materials is also avoided ,
- foreign material is always also understood to mean the surrounding atmosphere, in particular air. Foreign material layers that do not adhere directly but are only present indirectly in the surface area should also be removed.
- the coating fluid is advantageously applied to the material to be coated by at least partial dipping, brushing, spraying, pouring or the like.
- a liquid, a gas, a vapor, a mist, a gel, a paste, a suspension or the like are preferred as the coating fluid. All of these coating fluids contain z. B. at least one output,
- a carrier which can also be regarded as a solvent, contains a starting, auxiliary and / or additive for the coating material, which then changes after a certain time after the application of the coating fluid and / or after Exposure or addition of additional substances or converted into the actual coating material by radiation.
- a variant is conceivable in which the starting material, auxiliary material and / or additive is applied in a solvent and then turns on after exposure to the solvent after evaporation
- the aim of avoiding mechanical, electrical and insulation problems due to foreign material / gas inclusions is particularly advantageously achieved in that at least parts of the material to be coated are cleaned, in particular with, before, during and / or after exposure to low pressure, in particular with vacuum Solvents, by sputtering and / or by baking or the like.
- a typical cleaning process can therefore consist, for example, in that after the formation of a carrier which is to accommodate a circuit arrangement after the coating, the carrier itself is rinsed with an organic solvent. Subsequently, the evacuation, ie the application of a vacuum, can then begin, solvent residues then also being evaporated from the surface and from the cavities. This is accelerated by the fact that the carrier is heated up at the same time. B. the adhesion property of the conductor substrate on the ceramic carrier substrate - must be taken into account. The surface can then be sputtered while heating or afterwards while maintaining the vacuum, for example with an argon atmosphere at low pressure.
- a layer of a coating fluid is formed under an atmosphere of lower pressure, in particular under vacuum. This means that the application of an atmosphere of lower pressure starts before the formation of a layer of a coating fluid, but the lower pressure can be maintained during the actual coating process.
- the pressure in particular the ambient pressure on the layer formed, is increased in order to bring the coating fluid to the surface of the material to be coated, especially in the cavities of it to press. This ensures that no voids remain under the layer formed, into which coating material then sags at a later point in time, for example as part of an aging process, and thus changes in shape at a later point in time and possible other cracks or other defects of the developed layer.
- the described method according to the invention can already be used profitably and with advantage over the prior art when forming a single layer, it is particularly advantageous if the steps of cleaning, forming a layer of a coating fluid and / or the step of applying one low / high pressure at least in part several times, in particular iteratively one after the other, to be carried out in particular several Form layers on top of each other and / or in different areas on the material to be coated.
- Several independent cleaning processes can also be provided in order to provide particularly pure surface structures for the coating process.
- the coating method according to the invention is particularly advantageous if a first layer of a first coating fluid is applied, in particular under vacuum conditions, in order to fill the cavities of the material to be coated. A second layer of a second coating fluid is then subsequently applied, in particular also under vacuum conditions.
- the first coating fluid is selected so that it is chemically and / or physically compatible or compatible with the second coating fluid, in particular in order to mix and / or combine with it.
- a volatile solvent is selected as the first coating fluid, which in particular dissolves the coating medium and / or the second coating fluid. As a result, particularly good mixing is achieved and phase separation when the layer is formed is avoided.
- the volatile solvent is preferably heated as the first coating fluid after the application of the second layer by heating.
- 1 shows a carrier which has been coated with an embodiment of the method according to the invention
- 2 shows a block diagram of an exemplary embodiment of the method for coating according to the invention.
- the material 1 to be coated consists of a DCB substrate 10 constructed in three layers with a central ceramic carrier 11, an upper metallization layer 12, for example made of copper, which serves to receive, contact and connect electronic circuit arrangements, and has a lower metallization layer 13, which in operation serves to heat the entire arrangement.
- the upper metallization layer 12 serves to receive, contact and connect electronic components, adjacent areas of the upper metallization layer 12 and also the metallization layer 12 must be electrically insulated from one another against the metallization layer 13.
- a layer 2 of a coating material 3 is applied in the edge region 14 of a region of the metallization layer 12.
- the problem here is that cavities 7 in the upper metallization layer 12, in the ceramic carrier 11 or on the other side thereof, particularly in the edge regions
- Interface 15 occur.
- the cavity 7 is formed in the area of the interface 15 between the upper metallization layer 12 and the ceramic carrier 11 of the DCB substrate 10 and is already filled with the coating material 3 of the layer 2 by the method for coating according to the invention. so that there are no foreign materials, in particular no gases, which can exert strong thermal alternating loads on the layer 2.
- step S1 shows in the form of a schematic block diagram the sequence of an embodiment of the coating method according to the invention.
- the preparations for the coating process are made, that is to say the carrier or the material to be coated is provided, held and fixed and introduced into a corresponding process space, which can be closed off from the environment.
- step S2 the surface of the carrier is first roughly pre-cleaned by rinsing with a solvent. This step is basically optional.
- step S3 the process space is filled with a protective gas atmosphere, for example an inert gas, and then subsequently evacuated and heated in order to detach and remove the foreign materials and impurities on the surface of the material to be coated or the carrier, in particular in the cavities of the Surface.
- a protective gas atmosphere for example an inert gas
- step S4 the first layer of a first coating material, namely a solvent, is applied while maintaining the vacuum and possibly the heated state.
- step S5 The pressure is then increased in step S5 in order to press the first coating fluid into the cavity.
- a second layer of a second coating fluid which contains the coating material as such in solution, is then applied.
- step S7 the device is again evacuated and heated in order to evaporate the solvents and to achieve a solidification of the actual coating material.
- step S8 of the final phase the finished coated carrier is removed.
- the atmosphere Before, during and / or after each process step, the atmosphere can in principle be changed and / or the pressure can be increased or decreased.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000124373 DE10024373B4 (en) | 2000-05-17 | 2000-05-17 | Method for coating |
DE10024373.8 | 2000-05-17 |
Publications (3)
Publication Number | Publication Date |
---|---|
WO2001087500A2 true WO2001087500A2 (en) | 2001-11-22 |
WO2001087500A3 WO2001087500A3 (en) | 2002-03-14 |
WO2001087500B1 WO2001087500B1 (en) | 2002-07-18 |
Family
ID=7642527
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/001523 WO2001087500A2 (en) | 2000-05-17 | 2001-04-20 | Coating method |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE10024373B4 (en) |
WO (1) | WO2001087500A2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5972428A (en) * | 1996-03-05 | 1999-10-26 | Symetrix Corporation | Methods and apparatus for material deposition using primer |
US6056994A (en) * | 1988-12-27 | 2000-05-02 | Symetrix Corporation | Liquid deposition methods of fabricating layered superlattice materials |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5965219A (en) * | 1988-12-27 | 1999-10-12 | Symetrix Corporation | Misted deposition method with applied UV radiation |
DE4437269C1 (en) * | 1994-10-18 | 1996-02-22 | Balzers Hochvakuum | Cleaning workpiece surfaces |
DE19601436A1 (en) * | 1996-01-17 | 1997-07-24 | Siegfried Dr Ing Straemke | Method and device for the surface treatment of workpieces |
DE19644153A1 (en) * | 1996-10-24 | 1998-04-30 | Roland Dr Gesche | Multistage low pressure plasma cleaning process |
-
2000
- 2000-05-17 DE DE2000124373 patent/DE10024373B4/en not_active Expired - Fee Related
-
2001
- 2001-04-20 WO PCT/DE2001/001523 patent/WO2001087500A2/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6056994A (en) * | 1988-12-27 | 2000-05-02 | Symetrix Corporation | Liquid deposition methods of fabricating layered superlattice materials |
US5972428A (en) * | 1996-03-05 | 1999-10-26 | Symetrix Corporation | Methods and apparatus for material deposition using primer |
Also Published As
Publication number | Publication date |
---|---|
DE10024373A1 (en) | 2001-11-29 |
DE10024373B4 (en) | 2005-05-19 |
WO2001087500B1 (en) | 2002-07-18 |
WO2001087500A3 (en) | 2002-03-14 |
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