WO2004113254A1 - スパッタリングターゲットの焼結方法 - Google Patents
スパッタリングターゲットの焼結方法 Download PDFInfo
- Publication number
- WO2004113254A1 WO2004113254A1 PCT/JP2004/004942 JP2004004942W WO2004113254A1 WO 2004113254 A1 WO2004113254 A1 WO 2004113254A1 JP 2004004942 W JP2004004942 W JP 2004004942W WO 2004113254 A1 WO2004113254 A1 WO 2004113254A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sintering
- porous body
- ceramic
- sintered
- target
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
- C23C14/3407—Cathode assembly for sputtering apparatus, e.g. Target
- C23C14/3414—Metallurgical or chemical aspects of target preparation, e.g. casting, powder metallurgy
Definitions
- the present invention relates to a sintering method capable of effectively suppressing density unevenness and warpage that occur during sintering of a sintered target, particularly a ceramic target.
- sputtering has been used for forming thin films for semiconductor devices and various electronic devices.
- charged particles are irradiated toward a target, the particles are bombarded from the target by the particle impact force, and the particles are opposed to the target.
- a target material is applied to a substrate such as a wafer.
- This is a film formation method for forming a thin film containing a substance composed of as a central component.
- the sintered target used in this sputtering film forming method particularly a ceramic target such as I ⁇ , usually has a flat plate shape, but relatively large warpage and uneven density occur in the sintering process. There is a major problem in terms of production efficiency and quality.
- the temperature of the target gradually increases.
- backing plate a material with good thermal conductivity (backing plate) such as pure copper or copper alloy is soldered on the back of the target, and diffusion bonding, crimping, and bonding using the anchor effect are used.
- the brackets are cooled by external cooling means to absorb the heat of the target.
- the target surface is not flat during this bonding, bonding with sufficient strength and heat transfer capability cannot be performed. Even if the warped target is forcibly bonded to the packing plate, bonding cannot be ensured, and a difference in heat conduction during sputtering causes a temperature distribution in the target, which may lead to destruction of the target.
- the sputter surface of the target generally needs to be processed to a flat surface. For this reason, if the target is warped during sintering, it is necessary to perform machining to obtain a flat surface on both sides.
- grinding is generally performed using diamond wheels or CBN wheels.
- the target In order to obtain a target with a predetermined thickness, the target is made thicker by the amount of warpage, and the warpage is ground by machining to form a flat plate. For this reason, if the warpage is large, it is necessary to use an excessive amount of raw materials in excess of the product amount, which leads to a decrease in yield.
- a ceramic target is sintered by placing it on a ceramic flat plate, which is referred to as a ceramic plate.
- a ceramic plate which is referred to as a ceramic plate.
- Attempts have been made to make multiple holes, cut grooves on the upper surface of a flat plate, or to arrange ceramic blocks at regular intervals to improve the air permeability of the lower surface of the sintered body (one side of the plate) ( Japanese Patent Application Laid-Open No. 2001-122628, Japanese Patent Application Laid-Open No. 2002-22678). This is thought to improve air permeability to some extent.
- the present invention reduces the warpage and uneven sintering generated during sintering of a sintered target, particularly a ceramic target, by improving the arrangement of a support plate on which the target is mounted during sintering and a ceramic block for supporting the target.
- An object of the present invention is to provide a sintering method that can be effectively suppressed and that can improve manufacturing yield and production efficiency.
- the present invention is a.
- a sintering target characterized in that when sintering a ceramic plate in the air or in a process gas atmosphere, a sintering material is placed on a flat ceramic porous body and sintered. Sintering method
- a porous body is placed on a ceramic block at an interval, and a ceramic plate to be sintered is placed thereon and sintered.
- FIG. 1 is a schematic explanatory view (a top view is a plan view, and a bottom view is a side view) of a sintering method of the present invention in which a target is disposed on a flat ceramic porous body (a set of ceramics).
- FIG. 1 is a schematic explanatory view of a sintering method of the present invention in which a target is arranged on a flat ceramic porous body (a set of ceramics).
- the upper part shows a plan view
- the lower part shows a side view.
- a ceramic block 1 is placed in a sintering furnace, and a flat ceramic porous body 2 of the present invention is placed thereon, and a ceramic molded body, which is a raw material for sintering a sputtering target, is further placed thereon. Place 3 and sinter.
- a ceramic molded body 3 which is a raw material for sintering of a sputtering gate, is heated and provided on a furnace wall every day.
- a gas inlet 4 for the atmosphere during sintering will be provided on the furnace wall or hearth.
- uniform sintering can be performed simply by placing the sintering member on a flat plate-shaped porous ceramic body, and variations in density and warpage can be prevented.
- the object to be sintered according to the present invention can be sintered in various atmospheric gases including the air, and can be widely applied to ceramic materials in general.
- the present invention includes all of them.
- the sputtering target after sintering has a large warp. In many cases, after sintering, a considerable amount is ground. It was necessary to have flatness. This warpage is caused by the non-uniformity of heat applied to the sputtering target during sintering, and the unbalanced gas atmosphere on the lower surface of the target (one side of the target) and the upper and side surfaces.
- the target near the furnace wall heats quickly and tends to be heated to a high temperature.
- the heating rate slows down and tends to heat to lower temperatures.
- the atmosphere in the furnace during sintering greatly affects the sintering behavior, so the gas atmosphere near the target is important.
- the gas blown into the furnace always flows near the surface on the upper and side surfaces of the getter, whereas on the lower surface of the target in contact with the setter, there is only gas that diffuses and enters from the side surface of the getter.
- sintering tends to be more difficult, which also causes uneven density in the sintered body and causes warpage. This is particularly noticeable in large evening getters exceeding the 30 Omm mouth.
- the porous plate (setter) of the present invention is extremely effective in improving gas flowability, and the heated sintering gas is applied to the lower surface rather than the upper surface of the target to be sintered. Gases enter and exit through the porous plate from any angle.
- porous plate Since the porous plate has a myriad of air holes randomly communicating with each other, such a gas can flow uniformly.
- the uniformity can be further improved by raising the porous plate from the position where the target was originally placed and introducing a sintering gas therebelow.
- the plate-shaped sintered body as the target material was sintered uniformly, and it became possible to significantly reduce the occurrence of warping of the spatter ring.
- the flat ceramic porous body is desirably made of zirconia or alumina.
- the ceramic porous body used here includes, for example, ceramic foam manufactured by Kurosaki Harima Co., Ltd.
- the alumina content is preferably 95% or more, and preferably 98% or more. Absent.
- the porosity of the porous body is suitably from 70 to 90% in order to impart air permeability.
- the density of the porous body is 0.5 to 1.5%.
- the thickness of the porous body is preferably 5 to 50 mm.
- the thickness is thin, it is preferable because the air permeability is better, but the strength is inferior.
- the strength is excellent, but the air permeability decreases. Therefore, the above range is appropriate. However, it is not limited to this range, and can be arbitrarily changed depending on the material of the sintered body, the sintering temperature, and the sintering time. The present invention covers all such conditions.
- a porous body is placed on a ceramic block at intervals, and a ceramic plate to be sintered is placed on the porous body and sintered.
- the ceramics block be raised from the hearth to 20 mm to 300 mm. If the height to raise the height is less than 20 mm, the gas flowing between the ceramic blocks tends to stay and the effect is reduced. If the thickness is more than 300 mm, the ceramic block itself becomes unstable, and it becomes difficult to support the porous body. In addition, the heat storage of the ceramic block becomes large, and the temperature distribution is deteriorated by force.
- the interval between the ceramic blocks is preferably 1 to 10 times the thickness of the porous body.
- the gap between the ceramic blocks is preferably wider in consideration of the gas flow, but the result is that the porous body is warped, and it is necessary to have an appropriate size for the thickness of the porous body.
- the placed ceramic blocks have a structure in which the openings between the blocks are perpendicular to the sintering gas outlet of the sintering furnace, that is, as shown in Fig. 1, the gas is directly introduced into the openings. Is preferred.
- the blowing port for the sintering gas is located at a lower portion of the porous plate, that is, at a position of the ceramic block.
- it is not particularly limited to such an arrangement form, and is not particularly limited as long as the function of the flat ceramic porous body is not impaired.
- the shape of the ceramic porous body can be arbitrarily designed according to the furnace, and any cuts or holes may be provided. However, it is assumed that the function of the ceramic porous body is not impaired.
- the ceramic block supporting the porous body can be a porous block.
- This porous block can have the same structure as the porous body. Thereby, the gas permeability of the processing gas can be further improved.
- porous block When a porous block is used in this way, there is no need to restrict the arrangement of gas outlets. For example, gas can be blown out from the lower side 5 of the porous block shown in the figure by passing through the block. Making the ceramic block a porous block is effective for gas distribution and flow.
- Indium oxide powder and tin oxide powder were mixed at a weight ratio of 9: 1, wet-pulverized by a bead mill, and then dried by adding a binder to obtain a mixed dry powder of acid oxide and tin oxide. .
- a rectangular ceramic molded body (ITO) with a width of 39 Omm, a length of 540 mm, a thickness of 8.5 mm, and a weight of 7.2 kg was produced by a pressing method. Sintering was performed using the array of targets on the hearth shown in FIG. 1 above.
- Alumina porous plates were used for the setting, and the thickness of the porous plates was 25 mm, each having a bulk density of 1.07 c c / g (porosity of 73.2%) and a bulk density of 0.
- Three kinds of porous plates having a porosity of 75 c cZg (porosity of 81.2%) and a bulk density of 0.97 c cZg (porosity of 75.7%) were used.
- the ceramic block that supports the porous plate is an aluminum block of 400X100X25mm, and the surface of 400X25mm is set to be the surface that comes in contact with the surface of the material, and the block spacing is 87.5mm. .
- Example 2 the average values of the warpage of the three sintered ITO targets were 0.55 mm, 0.72 mm, and 0.65 mm, respectively.
- the density of the sintered bodies was measured and found to be 7.13 g / cc in all cases.
- the warped portion was ground by a surface grinder and flattened.
- the yield was improved to 124, 121, and 122, respectively, assuming that the yield by the conventional method of Comparative Example 1 shown below was 100. (Example 2)
- a molded body was obtained in the same manner as in Example 1, and sintering was performed using the arrangement of the targets on the hearth shown in FIG. 1 described above.
- a porous plate made of zirconia was used for the setting.
- the porous material had a thickness of 25 mm and a bulk density of 0.94 g / cc (porosity of 83.1%).
- Sintering was performed in the same manner as in Example 1 under other conditions.
- a molded body was obtained in the same manner as in Example 1, and sintering was performed using the arrangement of the evening gates shown in FIG. 1 on the hearth.
- a regular alumina plate (not porous) was used for the setter. This was sintered under the same conditions as in Example 1.
- the average value of the warpage of the ITO sintered body target was 2.02 mm. Further, the sintered density of the obtained sintered body was measured, and as a result, it was 7.09 gZcc.
- Example 2 Grinding was performed in the same manner as in Example 1. For comparison with the other Examples 12 and Comparative Examples 2-4, the yield obtained by this was set to 100.
- a molded body was obtained in the same manner as in Example 1, and sintering was performed using the arrangement of the evening gates shown in FIG. 1 on the hearth.
- a porous plate made of zirconia and having a bulk density of 0.94 g Ze e (porosity of 83.1%) was used.
- the ceramic block that supports the porous plate was a 400 x 20 x 25 mm alumina block, with the 400 x 25 mm surface being in contact with the porous setter, with a block spacing of 87.5 mm.
- Sintering was performed under the same conditions as in Example 1 except for the above conditions.
- the average value of the warpage of the ITO sintered body target was 1.05 mm. Further, the sintered density of the obtained sintered body was measured to be 7.13 gZcc.
- a molded body was obtained in the same manner as in Example 1, and sintering was performed using the arrangement of the evening gates shown in FIG. 1 on the hearth.
- a porous plate made of zirconia and having a kaza density of 0.94 g Ze e (porosity of 83.1%) was used for the setting.
- the intervals between the ceramic sprockets supporting the porous plate were 25 mm and 200 mm, respectively.
- Sintering was performed under the same conditions as in Example 1 except for the above conditions. As a result, the average warpage of the ITO sintered target under these two conditions was 1.
- a molded body was obtained in the same manner as in Example 1, and sintering was performed using the arrangement of the evening gett shown in FIG. 1 on the hearth.
- a porous plate made of zirconia and having a kaza density of 0.94 g / cc (porosity: 83.1) was used for the setting.
- the thickness of the porous plate was set to 10 mm and 50 mm, respectively, and sintering was performed under the same conditions as in Example 1 under the other conditions.
- the average warpage of the ITO sintered compact under these two conditions was 1.97 mm and 1.42 mm, respectively.
- the sintered density of the obtained sintered body it was 7.13 g / cc and 7.12 gZcc, respectively.
- the porous plate warped by about 0.5 mm.
- the present invention uses a porous plate set (supporting plate) to effectively suppress warpage and sintering density variation that occur during sintering of a sintered target, particularly a ceramic target.
- a porous plate set supporting plate
- it has excellent features that it can be sintered at a lower temperature and can improve the production yield and production efficiency.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003172040 | 2003-06-17 | ||
JP2003-172040 | 2003-06-17 |
Publications (1)
Publication Number | Publication Date |
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WO2004113254A1 true WO2004113254A1 (ja) | 2004-12-29 |
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ID=33534667
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/004942 WO2004113254A1 (ja) | 2003-06-17 | 2004-04-06 | スパッタリングターゲットの焼結方法 |
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TW (1) | TWI241994B (ja) |
WO (1) | WO2004113254A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112917643A (zh) * | 2021-03-31 | 2021-06-08 | 河北惟新科技有限公司 | 大尺寸、无中间缺陷的ito平面靶素坯生产方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6028399U (ja) * | 1983-08-03 | 1985-02-26 | 東洋ゴム工業株式会社 | 多孔質セラミツク匣鉢 |
JP2001122668A (ja) * | 1999-10-22 | 2001-05-08 | Tosoh Corp | セラミックス焼結体の製造法 |
-
2004
- 2004-04-06 WO PCT/JP2004/004942 patent/WO2004113254A1/ja not_active Application Discontinuation
- 2004-04-07 TW TW93109568A patent/TWI241994B/zh not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6028399U (ja) * | 1983-08-03 | 1985-02-26 | 東洋ゴム工業株式会社 | 多孔質セラミツク匣鉢 |
JP2001122668A (ja) * | 1999-10-22 | 2001-05-08 | Tosoh Corp | セラミックス焼結体の製造法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112917643A (zh) * | 2021-03-31 | 2021-06-08 | 河北惟新科技有限公司 | 大尺寸、无中间缺陷的ito平面靶素坯生产方法 |
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Publication number | Publication date |
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TW200500318A (en) | 2005-01-01 |
TWI241994B (en) | 2005-10-21 |
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