JP2012056783A - Carbon crucible - Google Patents

Carbon crucible Download PDF

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Publication number
JP2012056783A
JP2012056783A JP2010199233A JP2010199233A JP2012056783A JP 2012056783 A JP2012056783 A JP 2012056783A JP 2010199233 A JP2010199233 A JP 2010199233A JP 2010199233 A JP2010199233 A JP 2010199233A JP 2012056783 A JP2012056783 A JP 2012056783A
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Prior art keywords
graphite sheet
sheet
straight body
graphite
carbon crucible
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Inventor
Osamu Okada
修 岡田
Yoshiaki Hirose
芳明 廣瀬
Tetsuya Yuki
哲也 幸
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Toyo Tanso Co Ltd
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Toyo Tanso Co Ltd
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Priority to JP2010199233A priority Critical patent/JP2012056783A/en
Priority to CN2011800427213A priority patent/CN103080389A/en
Priority to PCT/JP2011/069304 priority patent/WO2012032948A1/en
Priority to KR1020137006344A priority patent/KR20130138202A/en
Priority to US13/820,796 priority patent/US20130160703A1/en
Priority to TW100131936A priority patent/TW201229331A/en
Publication of JP2012056783A publication Critical patent/JP2012056783A/en
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Abstract

PROBLEM TO BE SOLVED: To provide a carbon crucible preventing leakage of SiO gas from a boundary portion between a straight barrel part and a saucer part, and preventing early progress of turning into SiC.SOLUTION: The carbon crucible 5 is one for holding a quartz crucible 4 used in a pulling-up apparatus of a single crystal of a metal such as silicon, and is constituted by being divided into a straight barrel part 9 and a saucer part 10. A graphite sheet 11 is disposed between the quartz crucible 4 and the carbon crucible 5 so as to cover at least a boundary portion A of the inner surface of the carbon crucible 5 between the inner surface and the straight barrel part 9 and the saucer part 10. The graphite sheet 11 is an expanded graphite sheet.

Description

本発明は、シリコン等の金属単結晶引上げ装置に使用される石英ルツボを保持するためのカーボン製ルツボに関するものである。   The present invention relates to a carbon crucible for holding a quartz crucible used in a device for pulling a metal single crystal such as silicon.

チョクラルスキー法(以下、「CZ法」という。)に用いられるルツボは、シリコンを溶融させるための石英ルツボとこれを収容する黒鉛ルツボとの二重構造となっている。近年、高収率でシリコン単結晶を得るため、大型サイズの単結晶が製造されるようになっている。それに伴い、黒鉛ルツボも大型のものが必要になっている。しかし、黒鉛ルツボの容量が多くなるにつれて、石英ルツボと黒鉛ルツボの熱膨張率の違いに起因する熱歪みも大きくなり、直胴部、特にその上縁部、及び底部から直胴部に連なる曲面部(以下、R部と称する)に応力が集中して黒鉛ルツボの割れが発生し易くなっている。この問題を解決するため、直胴部と受け皿部とが分割された黒鉛ルツボ(以下の特許文献1〜4参照)、直胴部に炭素繊維強化炭素材(C/C材)を用い、受け皿部に黒鉛材を用いた複合ルツボ(以下の特許文献5参照)が提案されている。   A crucible used in the Czochralski method (hereinafter referred to as “CZ method”) has a double structure of a quartz crucible for melting silicon and a graphite crucible for accommodating the crucible. In recent years, large-size single crystals have been manufactured in order to obtain silicon single crystals with high yield. Accordingly, a large graphite crucible is required. However, as the capacity of the graphite crucible increases, the thermal strain due to the difference in thermal expansion coefficient between the quartz crucible and the graphite crucible also increases, and the straight body part, in particular, the upper edge part and the curved surface connected from the bottom part to the straight body part. Stress concentrates on the part (hereinafter referred to as R part), and the graphite crucible is easily cracked. In order to solve this problem, a graphite crucible (see Patent Documents 1 to 4 below) in which a straight body portion and a receiving tray portion are divided, and a carbon fiber reinforced carbon material (C / C material) is used for the straight body portion. A composite crucible (see Patent Document 5 below) using a graphite material for the part has been proposed.

登実3012299号公報No. 3012299 特開平07−25694号公報Japanese Patent Application Laid-Open No. 07-25694 特開平09−263482号公報JP 09-263482 A 特開2000−247781号公報JP 2000-247781 A 特開昭63−7174号公報JP-A-63-7174

ところで、シリコン単結晶引き上げ装置によりシリコン単結晶を成長させる間、シリコン融液よりSiOが揮発する。このSiOガスは、チャンバ内に導入されるArガスと共に真空ポンプでチャンバから排気されるが、一方で、黒鉛ルツボと石英ルツボの隙間にも入り込み、SiOと黒鉛ルツボのCが反応し、黒鉛ルツボ内面のSiC化が進行する。
さらに、この黒鉛ルツボのSiC化層とSiO(石英ルツボ)が反応し、SiCが消耗しながら、SiOとCOガスが発生する。これにより黒鉛ルツボ105の減肉(消耗)が進行していく。特に、黒鉛ルツボが分割されたものである場合、直胴部と受け皿部との境界部分でガスの流入・流出が起こり、著しく減肉が進行する。
By the way, while the silicon single crystal is grown by the silicon single crystal pulling apparatus, SiO is volatilized from the silicon melt. This SiO gas is exhausted from the chamber by a vacuum pump together with Ar gas introduced into the chamber, but on the other hand, it also enters the gap between the graphite crucible and the quartz crucible, and the SiO and the graphite crucible C react to form a graphite crucible. SiC conversion of the inner surface proceeds.
Further, the SiC crucible layer of the graphite crucible reacts with SiO 2 (quartz crucible), and SiO and CO gas are generated while SiC is consumed. Thereby, the thinning (consumption) of the graphite crucible 105 proceeds. In particular, when the graphite crucible is divided, gas inflow / outflow occurs at the boundary portion between the straight body portion and the tray portion, and the thinning proceeds remarkably.

上記反応を以下にまとめる。
(1)石英ルツボとSiの反応
SiO+Si→2SiO
(2)石英ルツボと黒鉛ルツボとの反応
SiO+C→SiO+CO
SiO+C→SiC+O
(3)生成したSiOガスとルツボとの反応
2SiO+2C→2SiC+O
(4)生成したOガス、COガスとの反応(酸化)
+C→CO
+2C→2CO、2CO+C→2C(スス)+CO
The above reaction is summarized below.
(1) Reaction between quartz crucible and Si SiO 2 + Si → 2SiO
(2) Reaction between quartz crucible and graphite crucible SiO 2 + C → SiO + CO
SiO 2 + C → SiC + O 2
(3) Reaction between generated SiO gas and crucible 2SiO + 2C → 2SiC + O 2
(4) Reaction with generated O 2 gas and CO gas (oxidation)
O 2 + C → CO 2
O 2 + 2C → 2CO, 2CO + C → 2C (soot) + CO 2

そして、これらの反応により著しく減肉が進行した黒鉛ルツボを使用すると、石英ルツボが減肉部分へ局部的に陥没していく。操業時間が長時間になると、陥没部に割れ目ができ、シリコン融液がこの割れ目から外へ漏れ出し、炉内にシリコン融液が溜まってしまう恐れがある。この為、減肉量がある一定量を超えると、黒鉛ルツボを新品に交換する必要がある。   When a graphite crucible whose thickness is significantly reduced by these reactions is used, the quartz crucible locally sinks into the reduced thickness portion. If the operation time is prolonged, a crack may be formed in the depressed portion, and the silicon melt may leak out from the crack and the silicon melt may accumulate in the furnace. For this reason, when the amount of thinning exceeds a certain amount, it is necessary to replace the graphite crucible with a new one.

このように、ルツボが分割されたものである場合、直胴部と受け皿部との境界部分からのSiOガスが漏洩し、SiC化が早期に進行するという問題がある。
しかしながら、上記の特許文献1〜5には、直胴部と受け皿部との境界部分からのSiC化進行に対する有効な対策は開示されておらず、従来より、直胴部と受け皿部との境界部分からのSiOガスの漏洩を防止するようにしたカーボン製ルツボが所望されていた。
As described above, when the crucible is divided, there is a problem that SiO gas leaks from the boundary portion between the straight body portion and the tray portion and SiC conversion proceeds at an early stage.
However, the above Patent Documents 1 to 5 do not disclose effective measures against the progress of SiC conversion from the boundary portion between the straight body portion and the tray portion, and conventionally, the boundary between the straight body portion and the tray portion. A carbon crucible designed to prevent leakage of SiO gas from the portion has been desired.

本発明は、上記の実情を鑑みて考え出されたものである。その目的は、直胴部と受け皿部との境界部分からのSiOガスの漏洩を防止し、SiC化の早期進行を防止するようにしたカーボン製ルツボを提供することである。   The present invention has been devised in view of the above circumstances. The object is to provide a carbon crucible that prevents leakage of SiO gas from the boundary portion between the straight body portion and the tray portion and prevents early progress of SiC conversion.

上記目的を達成するため本発明は、直胴部と受け皿部とが分割されたカーボン製ルツボであって、カーボン製ルツボの内面の、少なくとも直胴部と受け皿部との境界部分を覆うように、黒鉛質シートを配置したことを要旨とする。   To achieve the above object, the present invention provides a carbon crucible in which a straight body portion and a saucer portion are divided so as to cover at least a boundary portion between the straight body portion and the saucer portion on the inner surface of the carbon crucible. The gist is that a graphite sheet is disposed.

上記構成によれば、直胴部と受け皿部との境界部分を黒鉛質シートが覆うことにより、境界部分からのSiOガスの漏洩が防がれ、カーボン製ルツボのSiC化の早期進行を防止することができる。   According to the above configuration, the graphite sheet covers the boundary portion between the straight body portion and the tray portion, so that leakage of SiO gas from the boundary portion is prevented, and early progress of SiC conversion of the carbon crucible is prevented. be able to.

本発明においては、前記黒鉛質シートは膨張黒鉛シートであるのが好ましい。
上記構成によれば、膨張黒鉛シートはクッション性が高いので、黒鉛質シートが挟み付けられた場合、石英るつぼと境界部分との間で圧縮されて隙間なく配置され、SiOガスの漏洩を更に抑止することができる。
In the present invention, the graphite sheet is preferably an expanded graphite sheet.
According to the above configuration, the expanded graphite sheet has a high cushioning property. Therefore, when the graphite sheet is sandwiched, the expanded graphite sheet is compressed between the quartz crucible and the boundary portion and disposed without a gap, and further suppresses leakage of SiO gas. can do.

本発明においては、前記黒鉛質シートは、その灰分が100ppm以下であるのが好ましい。
上記構成によれば、黒鉛質シートから生じる金属系の不純物を少なくでき、特に半導体用途の金属単結晶において品質の安定化に繋げることができる。
In the present invention, the graphite sheet preferably has an ash content of 100 ppm or less.
According to the said structure, the metal type impurity which arises from a graphite sheet can be decreased, and it can lead to stabilization of quality especially in the metal single crystal for a semiconductor use.

本発明においては、前記直胴部は炭素繊維強化炭素複合材(C/C材)から成り、前記黒鉛質シートは、前記境界部に加えて、直胴部の内面全体を覆うように配置されているのが好ましい。
上記構成によれば、ボーラスで「くわれ」の生じ易いC/C製直胴部と境界部分とを同時に覆うことで、カーボン製るつぼの耐久性を飛躍的に向上させることができる。
In the present invention, the straight body portion is made of a carbon fiber reinforced carbon composite material (C / C material), and the graphite sheet is disposed so as to cover the entire inner surface of the straight body portion in addition to the boundary portion. It is preferable.
According to the above configuration, the durability of the carbon crucible can be drastically improved by simultaneously covering the C / C straight body portion and the boundary portion that are likely to be “buckled” by the bolus.

本発明においては、前記直胴部は複数に分割された黒鉛製分割片で構成され、前記黒鉛質シートは、前記境界部に加えて、直胴部の内面全体を覆うように配置されているのが好ましい。
上記構成によれば、黒鉛で受け皿部と別体の直胴部を形成した場合には、直胴部が温度変化により割れが生じ易くなるため、直胴部を分割化することが必須となる。しかし、直胴部を分割化すると、分割部分でSiOガスの漏洩が生じる恐れがある。そこで、上記構成のように、分割部分と境界部分とを黒鉛質シートで覆うことでSiOガスの漏洩により生じる不具合を防止できる。
In the present invention, the straight body portion is composed of a plurality of divided graphite pieces, and the graphite sheet is disposed so as to cover the entire inner surface of the straight body portion in addition to the boundary portion. Is preferred.
According to the above configuration, when the straight body part separate from the tray part is formed of graphite, the straight body part is likely to be cracked due to temperature change, so it is essential to divide the straight body part. . However, if the straight body portion is divided, there is a risk of leakage of SiO gas at the divided portion. Therefore, as in the above-described configuration, it is possible to prevent problems caused by leakage of SiO gas by covering the divided portion and the boundary portion with a graphite sheet.

本発明においては、前記受け皿部は、底部と、底部から前記直胴部に連なる曲面状部分(R部分)とで構成され、前記黒鉛質シートは、前記境界部に加えて、直胴部の内面全体から前記曲面状部分まで一体に覆うように配置されているのが好ましい。
上記の構成によれば、直胴部、境界部分、及び最も消耗の大きい受け皿部のR部を一体に覆うことで、確実にSiOガスの漏洩を防いで、局部的なSiC化を抑制することができる。
In the present invention, the saucer portion is composed of a bottom portion and a curved portion (R portion) that extends from the bottom portion to the straight body portion, and the graphite sheet includes a straight body portion in addition to the boundary portion. It is preferable to arrange so as to integrally cover the entire inner surface to the curved portion.
According to the above configuration, the straight body portion, the boundary portion, and the R portion of the receiving portion with the greatest wear are integrally covered, thereby reliably preventing leakage of SiO gas and suppressing local SiC conversion. Can do.

本発明においては、前記黒鉛質シートは、カーボン製ルツボの内面を一体に覆うように配置されているのが好ましい。
上記構成によれば、一体のシートで内面を被覆することで隙間が生じ難くなり、SiOガスの漏出やカーボン製ルツボと石英るつぼとの接触等を防止することができる。
In the present invention, the graphite sheet is preferably arranged so as to integrally cover the inner surface of the carbon crucible.
According to the above configuration, it is difficult to form a gap by covering the inner surface with an integral sheet, and leakage of SiO gas, contact between a carbon crucible and a quartz crucible can be prevented.

本発明においては、前記黒鉛質シートは、受け皿部内面を覆う平面円形状のシートと、直胴部内面を覆う筒状のシートが組み合わされ、両シートが境界部分で重ね合わされた構成であるのが好ましい。
上記構成によれば、受け皿部と直胴部とを別体として、とりわけ直胴部の上下寸法が大きくなった場合(太陽電池における融液の大容量化)でもシートの加工を容易にすることができる。また両シートが重ね合わされているため、石英るつぼと受け皿部が接触する不具合も防ぐことができる。
In the present invention, the graphite sheet has a configuration in which a planar circular sheet covering the inner surface of the tray part and a cylindrical sheet covering the inner surface of the straight body part are combined, and both sheets are overlapped at the boundary part. Is preferred.
According to the above-described configuration, the processing of the sheet is facilitated even when the vertical and vertical dimensions of the straight barrel portion are increased (the increase in the capacity of the melt in the solar cell), with the receiving tray portion and the straight barrel portion as separate bodies. Can do. Moreover, since both sheets are overlapped, the problem of contact between the quartz crucible and the tray portion can be prevented.

本発明においては、前記受け皿部は複数に分割された黒鉛製分割片で構成され、前記黒鉛質シートは、前記分割片同士の突合せ部分付近を覆う受け皿シート部と、前記境界部分を覆う境界シート部とを備えた構成であるのが好ましい。
上記構成によれば、少ないシートの量で、SiOガスの漏洩を防止し、局部的なSiC化を抑制するのに十分な効果を得ることができる。
In the present invention, the saucer portion is composed of a plurality of divided graphite pieces, and the graphite sheet is a saucer sheet portion that covers the vicinity of the abutting portion between the divided pieces, and a boundary sheet that covers the boundary portion. It is preferable that it is the structure provided with the part.
According to the above configuration, it is possible to obtain an effect sufficient to prevent leakage of SiO gas and suppress local SiC formation with a small amount of sheet.

本発明においては、前記黒鉛質シートは、複数枚を重ねた構成であるのが好ましい。
上記構成によれば、受け皿部と直胴部との間に生じる段差への対応が容易となり、またクッション性を高めて段差付近の隙間の発生を抑制し、当該隙間からのSiOガスの漏洩を防止することができる。
In the present invention, the graphite sheet preferably has a structure in which a plurality of sheets are stacked.
According to the above configuration, it becomes easy to cope with the step generated between the tray portion and the straight body portion, and the cushioning property is enhanced to suppress the generation of a gap near the step, and the leakage of SiO gas from the gap is prevented. Can be prevented.

本発明においては、前記黒鉛質シートは、厚さが0.2〜1.0mm、かさ密度が0.7〜1.3g/cmであるのが好ましい。
上記構成によれば、中敷として必要なシート厚み及びかさ密度として、高い性能を備えさせることができる。
In the present invention, the graphite sheet preferably has a thickness of 0.2 to 1.0 mm and a bulk density of 0.7 to 1.3 g / cm 3 .
According to the said structure, high performance can be provided as sheet | seat thickness and bulk density required as an insole.

本発明によれば、直胴部と受け皿部との境界部分を黒鉛質シートが覆うことにより、境界部分からのSiOガスの漏洩が防がれ、カーボン製ルツボのSiC化の早期進行を防止することができる。   According to the present invention, the graphite sheet covers the boundary portion between the straight body portion and the tray portion, so that leakage of SiO gas from the boundary portion is prevented, and early progress of SiC conversion of the carbon crucible is prevented. be able to.

本実施の形態に係るシリコン単結晶引き上げ装置の要部断面図。FIG. 3 is a cross-sectional view of a main part of the silicon single crystal pulling apparatus according to the present embodiment. ルツボの拡大断面図。The expanded sectional view of a crucible. 黒鉛質シートの他の配置態様を示す図。The figure which shows the other arrangement | positioning aspect of a graphite sheet. 黒鉛質シートの他の配置態様を示す図。The figure which shows the other arrangement | positioning aspect of a graphite sheet. 図4の配置態様に使用される黒鉛質シートの形状を示す図。The figure which shows the shape of the graphite sheet used for the arrangement | positioning aspect of FIG. 黒鉛質シートの他の配置態様を示す図。The figure which shows the other arrangement | positioning aspect of a graphite sheet. 図6の配置態様に使用される黒鉛質シートの形状を示す図。The figure which shows the shape of the graphite sheet used for the arrangement | positioning aspect of FIG. 平面円形状のシート11aの形状を示す図。The figure which shows the shape of the planar circular sheet | seat 11a. 実施の形態3に使用される受け皿部10の平面図。The top view of the saucer part 10 used for Embodiment 3. FIG. 実施の形態3に使用される黒鉛質シートの形状を示す図。FIG. 4 is a diagram showing the shape of a graphite sheet used in Embodiment 3.

以下、本発明を実施の形態に基づいて詳述する。なお、本発明は、以下の実施の形態に限定されるものではない。
(金属単結晶引上げ装置の構成)
図1は本実施の形態に係るシリコン単結晶引き上げ装置の要部断面図、図2はルツボの拡大断面図である。図1において、1は単結晶引き上げ装置、2はシャフト、4はシリコン融液3を収容する石英ルツボ4、5は石英ルツボ4を保持するカーボン製ルツボである。カーボン製ルツボ5の外周にはヒータ6が配置されており、このヒータ6によりカーボン製ルツボ5及び石英ルツボ4を介してシリコン融液3を加熱し、インゴット7を引き上げながらシリコン単結晶を作製する。
Hereinafter, the present invention will be described in detail based on embodiments. Note that the present invention is not limited to the following embodiments.
(Configuration of metal single crystal pulling device)
FIG. 1 is a cross-sectional view of a main part of a silicon single crystal pulling apparatus according to the present embodiment, and FIG. 2 is an enlarged cross-sectional view of a crucible. In FIG. 1, 1 is a single crystal pulling device, 2 is a shaft, 4 is a quartz crucible 4 containing a silicon melt 3, and 5 is a carbon crucible holding a quartz crucible 4. A heater 6 is disposed on the outer periphery of the carbon crucible 5. The silicon melt 3 is heated by the heater 6 through the carbon crucible 5 and the quartz crucible 4, and a silicon single crystal is produced while pulling up the ingot 7. .

カーボン製ルツボ5は、略円筒状の直胴部9と受け皿部10とを備え、直胴部9と受け皿部10とが分割された構成となっている。直胴部9は受け皿部10に載置され、直胴部9と受け皿部10の各突合せ面が嵌合されて固着化されている。そして、石英ルツボ4とカーボン製ルツボ5との間において、カーボン製ルツボ5の内面の、少なくとも直胴部9と受け皿部10との境界部分Aを覆うように、黒鉛質シート11が配置されている。
直胴部9は炭素繊維強化炭素(C/C材)製であり、受け皿部10は黒鉛製である。この受け皿部10は、底部10aと、底部10aから直胴部9に連なる曲面状部分(以下、R部と称する)10bとで構成されている。
The carbon crucible 5 includes a substantially cylindrical straight body portion 9 and a saucer portion 10, and the straight body portion 9 and the saucer portion 10 are divided. The straight body portion 9 is placed on the saucer portion 10, and the butted surfaces of the straight body portion 9 and the saucer portion 10 are fitted and fixed. A graphite sheet 11 is arranged between the quartz crucible 4 and the carbon crucible 5 so as to cover at least the boundary portion A between the straight body portion 9 and the tray portion 10 on the inner surface of the carbon crucible 5. Yes.
The straight body portion 9 is made of carbon fiber reinforced carbon (C / C material), and the tray portion 10 is made of graphite. The tray portion 10 includes a bottom portion 10a and a curved portion (hereinafter referred to as an R portion) 10b that extends from the bottom portion 10a to the straight body portion 9.

黒鉛質シート11は、膨張黒鉛シートであるのが好ましい。なぜなら、膨張黒鉛シートはクッション性が高いので、黒鉛質シート11が挟み付けられた場合、石英ルツボ4と境界部分Aとの間で圧縮されて隙間なく配置され、SiOガスの漏洩を更に抑止することができるからである。   The graphite sheet 11 is preferably an expanded graphite sheet. Because the expanded graphite sheet has a high cushioning property, when the graphite sheet 11 is sandwiched, the expanded graphite sheet is compressed between the quartz crucible 4 and the boundary portion A and arranged without a gap, and further suppresses leakage of SiO gas. Because it can.

黒鉛質シート11として使用される膨張黒鉛シートは、厚さ0.2〜1.0mm、かさ密度0.7〜1.3g/cm程度のものが好ましい。 The expanded graphite sheet used as the graphite sheet 11 is preferably about 0.2 to 1.0 mm in thickness and about 0.7 to 1.3 g / cm 3 in bulk density.

また、黒鉛質シート11は、灰分が100ppm以下、特に好ましくは灰分50ppm以下の高純度のものが好ましい。黒鉛質シート11から生じる金属系の不純物を少なくでき、特に、半導体用途の金属単結晶において品質の安定化に繋げることができるからである。
なお、直胴部9や受け皿部10に熱分解炭素等の被覆や含浸が施されていてもよい。
The graphite sheet 11 preferably has a high purity with an ash content of 100 ppm or less, particularly preferably an ash content of 50 ppm or less. This is because metal impurities generated from the graphite sheet 11 can be reduced, and in particular, quality can be stabilized in a metal single crystal for semiconductor use.
The straight body portion 9 and the tray portion 10 may be coated or impregnated with pyrolytic carbon or the like.

(黒鉛質シートの配置態様)
黒鉛質シート11の配置は、以下に述べる種々の態様が存在する。
(1)黒鉛質シート11を、カーボン製ルツボ5の内面の、直胴部9と受け皿部10との境界部分Aを覆うように配置する態様(図2参照)
このように黒鉛質シート11を直胴部9と受け皿部10との境界部分Aを覆うように配置すると、直胴部9と受け皿部10とが分割されたルツボにおいて特に問題となる境界部分AからのSiOガスの漏洩が防がれ、カーボン製ルツボのSiC化の早期進行を防止することができる。
(Arrangement of graphite sheet)
The arrangement of the graphite sheet 11 has various modes described below.
(1) The aspect which arrange | positions the graphite sheet 11 so that the boundary part A of the straight body part 9 and the saucer part 10 of the inner surface of the carbon crucible 5 may be covered (refer FIG. 2).
Thus, when the graphite sheet 11 is arranged so as to cover the boundary portion A between the straight body portion 9 and the saucer portion 10, the boundary portion A that is particularly problematic in the crucible in which the straight body portion 9 and the saucer portion 10 are divided. Leakage of SiO gas from the carbon is prevented, and early progress of SiC conversion of the carbon crucible can be prevented.

(2)黒鉛質シート11を、境界部分Aに加えて直胴部9の内面全体をも覆うように配置する態様(図3参照)
上記配置態様で黒鉛質シート11を配置すれば、ボーラスで「くわれ」の生じ易いC/C製直胴部9と境界部分Aとを同時に覆うことで、カーボン製ルツボ5の耐久性を飛躍的に向上させることができる。
(2) A mode in which the graphite sheet 11 is arranged so as to cover the entire inner surface of the straight body portion 9 in addition to the boundary portion A (see FIG. 3).
If the graphite sheet 11 is arranged in the above arrangement mode, the durability of the carbon crucible 5 is greatly improved by simultaneously covering the C / C straight body part 9 and the boundary part A, which are likely to be “broken” by a bolus. Can be improved.

(3)黒鉛質シート11を、直胴部9の内面全体を覆うと共に、さらに受け皿部10のR部10bまで一体として覆うように配置する態様(図4参照)
上記配置態様で黒鉛質シート11を配置すれば、直胴部9、境界部分A、及び最も消耗の大きい受け皿部10のR部10bを一体に覆うことで、確実にSiOガスの漏洩を防いで、局部的なSiC化を抑制することができる。
この場合の黒鉛質シート11は、例えば、図5に示すように、上方は直胴部9に沿い、下端付近が受け皿部10のR部10bに沿うような形となる形状が用いられる。
(3) The aspect which arrange | positions the graphite sheet 11 so that it may cover the whole inner surface of the straight trunk | drum 9, and also to the R part 10b of the saucer part 10 integrally (refer FIG. 4).
If the graphite sheet 11 is arranged in the above arrangement mode, the straight body part 9, the boundary part A, and the R part 10b of the receiving part 10 with the greatest wear are integrally covered, thereby reliably preventing leakage of SiO gas. , Local SiC can be suppressed.
For example, as shown in FIG. 5, the graphite sheet 11 in this case has a shape in which the upper portion is along the straight body portion 9 and the vicinity of the lower end is along the R portion 10 b of the tray portion 10.

(4)黒鉛質シート11を、カーボン製ルツボ5の内面を一体として覆うように配置する態様(図6参照)
上記配置態様で黒鉛質シート11を配置すれば、一体のシートで内面を被覆することで隙間が生じ難くなり、SiOガスの漏出やカーボン製ルツボ5と石英ルツボ4との接触等を防止することができる。
この態様における黒鉛質シート11としては、例えば図7に示す形状のシートが用いられる。即ち、シート11の下端に切れ目30を入れてルツボ5の底面形状に沿わせると、底部は球状面を構成する。この際の切れ目30の大きさは、ルツボの受け皿部10の形状特に底部10aの曲率に合わせて適宜に決定すればよい。
(4) A mode in which the graphite sheet 11 is disposed so as to integrally cover the inner surface of the carbon crucible 5 (see FIG. 6).
If the graphite sheet 11 is arranged in the above arrangement mode, it becomes difficult to form a gap by covering the inner surface with an integral sheet, and it is possible to prevent leakage of SiO gas and contact between the carbon crucible 5 and the quartz crucible 4. Can do.
As the graphite sheet 11 in this embodiment, for example, a sheet having a shape shown in FIG. 7 is used. That is, when the cut 30 is made at the lower end of the sheet 11 and conforms to the shape of the bottom of the crucible 5, the bottom forms a spherical surface. The size of the cut 30 at this time may be determined as appropriate in accordance with the shape of the crucible tray 10, particularly the curvature of the bottom 10 a.

(5)黒鉛質シート11を、受け皿部10内面を覆う平面円形状のシート11aと、直胴部9内面を覆う筒状のシートが組み合わされ、両シートが境界部分で重ね合わされるように配置する態様
上記配置態様で黒鉛質シート11を配置すれば、受け皿部10と直胴部9とを別体として、とりわけ直胴部9の上下寸法が大きくなった場合(太陽電池における融液の大容量化)でもシートの加工を容易にすることができる。また両シートが重ね合わされているため、石英ルツボ4と受け皿部10が接触する不具合も防ぐことができる。
この態様における平面円形状のシート11aとしては、例えば、図8に示す形状のシートであり、筒状のシートとしては、例えば図5のような形状のシートである。図8に示す形状のシートでは、円形の外縁に設けられたスリット31により、円形の周辺がR部10bに沿うような形となり、図5のようなシートと組み合わせることでR部10bのやや下方で両シートが重なり合い、隙間のない配置とできる。
(5) The graphite sheet 11 is arranged so that the planar circular sheet 11a covering the inner surface of the tray part 10 and the cylindrical sheet covering the inner surface of the straight body part 9 are combined, and both sheets are overlapped at the boundary portion. If the graphite sheet 11 is arranged in the above arrangement mode, when the vertical and vertical dimensions of the straight body part 9 are increased with the tray part 10 and the straight body part 9 separated from each other (a large amount of melt in the solar cell). Even when the capacity is increased, the sheet can be easily processed. Moreover, since both sheets are overlapped, the problem of contact between the quartz crucible 4 and the tray portion 10 can be prevented.
The planar circular sheet 11a in this embodiment is, for example, a sheet having the shape shown in FIG. 8, and the cylindrical sheet is, for example, a sheet having a shape as shown in FIG. In the sheet having the shape shown in FIG. 8, the circular periphery is formed along the R portion 10 b by the slit 31 provided at the outer edge of the circle, and is slightly below the R portion 10 b by combining with the sheet as shown in FIG. 5. The two sheets overlap each other and can be arranged without gaps.

(6)黒鉛質シート11は複数枚重ねて使用する態様
上記態様の使用により、受け皿部10と直胴部9との間に生じる段差への対応が容易となり、またクッション性を高めて段差付近の隙間の発生を抑制し、当該隙間からのSiOガスの漏洩を防止することができる。より詳しく説明すれば、直胴部9と受け皿部10とが分割されたルツボにおいては、受け皿部10と直胴部9との間に段差が生じる場合があり、当該隙間からSiOガスが漏洩する恐れがある。このような場合に、黒鉛質シート11は複数枚重ねて使用すると、クッション性が高められ、受け皿部10と直胴部9との間に生じる段差付近の隙間の発生が抑制されるので、当該隙間からのSiOガスの漏洩を防止することができる。
(6) A mode in which a plurality of graphite sheets 11 are used in a stacked manner The use of the above mode makes it easy to cope with a step formed between the tray portion 10 and the straight body portion 9, and also enhances cushioning properties in the vicinity of the step. The generation of the gap can be suppressed, and the leakage of SiO gas from the gap can be prevented. More specifically, in the crucible in which the straight body portion 9 and the saucer portion 10 are divided, a step may be generated between the saucer portion 10 and the straight body portion 9, and SiO gas leaks from the gap. There is a fear. In such a case, if a plurality of graphite sheets 11 are used in an overlapping manner, the cushioning property is enhanced, and the occurrence of a gap near the step generated between the tray part 10 and the straight body part 9 is suppressed. Leakage of SiO gas from the gap can be prevented.

(膨張黒鉛シートの製造方法)
膨張黒鉛シートは、以下の方法で作製される。1枚物の膨張黒鉛シートは膨張化黒鉛から製造されたシート状の材料であり、その代表例について説明すると以下の通りである。先ず、天然又は合成燐片状黒鉛やキッシュ黒鉛等を酸化剤で処理して、黒鉛粒子に層間化合物を形成せしめ、次いでこれを高温に加熱好ましくは急激に高温にさらして急膨張せしめる。この処理により黒鉛粒子の層間化合物のガス圧により、層平面直角方向に黒鉛粒子は拡大され通常100〜250倍程度に体積が急膨張するものである。この際使用される酸化剤としては層間化合物を形成せしめ得るものが使用され、例えば硫酸と硝酸との混酸、硫酸に硝酸ナトリウムや過マンガン酸カリ等の酸化剤を混合したものが例示できる。
次いで、不純物を灰分100ppm以下、特に好ましくは灰分50ppm以下に除去した後、この膨張化黒鉛を適宜な手段、例えば圧縮又はロール成形によってシート状に施して、膨張黒鉛シートを作製する。
次いで、上記方法で製造された膨張黒鉛シートを、上記配置態様に応じて所定寸法及び形状に裁断分割化して本発明に係る膨張黒鉛シート11を作製する。
(Method for producing expanded graphite sheet)
The expanded graphite sheet is produced by the following method. A single expanded graphite sheet is a sheet-like material manufactured from expanded graphite, and typical examples thereof are as follows. First, natural or synthetic flake graphite, quiche graphite or the like is treated with an oxidizing agent to form an intercalation compound on the graphite particles, which is then heated to a high temperature, preferably rapidly exposed to a high temperature and rapidly expanded. By this treatment, the graphite particles are expanded in the direction perpendicular to the layer plane by the gas pressure of the intercalation compound of the graphite particles, and the volume rapidly expands usually about 100 to 250 times. As the oxidizing agent used at this time, those capable of forming an intercalation compound are used, and examples thereof include a mixed acid of sulfuric acid and nitric acid, and a mixture of sulfuric acid and an oxidizing agent such as sodium nitrate or potassium permanganate.
Next, after removing impurities to an ash content of 100 ppm or less, particularly preferably an ash content of 50 ppm or less, the expanded graphite is applied to the sheet by an appropriate means, for example, compression or roll forming to produce an expanded graphite sheet.
Subsequently, the expanded graphite sheet manufactured by the above method is cut and divided into a predetermined size and shape according to the above arrangement form to produce the expanded graphite sheet 11 according to the present invention.

(実施の形態2)
本実施の形態2では、直胴部9が複数に分割された黒鉛製分割片で構成され、黒鉛質シート11は直胴部9の内面全体を覆うように配置された構成とされている。黒鉛で受け皿部10と別体の直胴部9を形成した場合には、直胴部9が温度変化により割れが生じ易くなるため、直胴部9を分割化することが必須となる。しかし、直胴部9を分割化すると、分割部分でSiOガスの漏洩が生じる恐れがある。そこで、本実施の形態2のように、分割部分(黒鉛製分割片の突合せ部分)と境界部分Aとを黒鉛質シート11で覆うことでSiOガスの漏洩により生じる不具合を防止できる。
(Embodiment 2)
In the second embodiment, the straight body portion 9 is constituted by a divided piece made of graphite divided into a plurality of pieces, and the graphite sheet 11 is arranged so as to cover the entire inner surface of the straight body portion 9. When the straight body portion 9 is formed separately from the receiving tray portion 10 with graphite, the straight body portion 9 is liable to be cracked due to a temperature change. Therefore, it is essential to divide the straight body portion 9. However, if the straight body portion 9 is divided, the SiO gas may leak at the divided portions. Therefore, as in the second embodiment, the division portion (the butt portion of the graphite division piece) and the boundary portion A are covered with the graphite sheet 11 to prevent a problem caused by leakage of SiO gas.

(実施の形態3)
本実施の形態3では、図9に示すように、受け皿部10を2分割した黒鉛製分割片40,40で構成するとともに、黒鉛質シート11は、図10に示すように、黒鉛製分割片40の分割部分A1(黒鉛製分割片同士の突合せ部分)付近を覆う受け皿シート部21と、前記境界部分Aを覆う境界シート部22とが一体的に形成された構成とされている。なお、境界シート部22には、R部に沿わせるため、外周内側にスリット41が設けられている。
(Embodiment 3)
In the third embodiment, as shown in FIG. 9, the tray portion 10 is composed of two divided pieces 40 and 40 made of graphite, and the graphite sheet 11 is divided into graphite pieces as shown in FIG. 10. A tray sheet portion 21 that covers the vicinity of 40 divided portions A1 (abutting portions of graphite divided pieces) and a boundary sheet portion 22 that covers the boundary portion A are integrally formed. In addition, the boundary sheet part 22 is provided with a slit 41 on the inner periphery in order to follow the R part.

持ち運び等の利便性から、黒鉛製受け皿部10を、例えば2分割や3分割に分割しておき、分割された各部分を各々突合せて受け皿部10を構成する。しかしながら、このような分割構成であれば、黒鉛製分割片40の分割部分A1からSiOガスが通過するため、これら分割部分A1が選択的にSiC化するおそれがある。そこで、本実施の形態3における黒鉛質シート11は、局所的にSiC化するおそれのある部分(黒鉛製分割片40の分割部分A1及び境界部分A)のみを黒鉛質シート11で覆うべく、分割部分A1付近を覆う受け皿シート部21と、境界部分Aを覆う境界シート部22とを備えた黒鉛質シート11を使用する。このような黒鉛質シート11により、少ないシートの量で、SiOガスの漏洩を防止し、局部的なSiC化を抑制するのに十分な効果を得ることができる。   For convenience of carrying and the like, the graphite tray 10 is divided into, for example, two parts or three parts, and the divided parts are abutted to form the tray part 10. However, with such a divided configuration, since the SiO gas passes through the divided portion A1 of the graphite divided piece 40, the divided portion A1 may be selectively converted to SiC. Therefore, the graphite sheet 11 according to the third embodiment is divided so as to cover only the portions (the divided portions A1 and the boundary portions A of the graphite-made divided pieces 40) that may be locally converted to SiC with the graphite sheet 11. The graphite sheet 11 provided with the saucer sheet portion 21 covering the vicinity of the portion A1 and the boundary sheet portion 22 covering the boundary portion A is used. With such a graphite sheet 11, it is possible to obtain a sufficient effect for preventing leakage of SiO gas and suppressing local SiC formation with a small amount of sheet.

本実施の形態では、2分割の例を示したが、3分割、4分割等に分割する構成であってもよい。また、受け皿シート部21と境界シート部22とを一体に設けているが、別体で設けるようにしてもよい。なお、一体であれば位置ずれを防止でき、別体であればシートの加工を簡便にできる。   In this embodiment, an example of two divisions is shown, but a configuration of division into three divisions, four divisions, or the like may be used. Further, although the tray sheet portion 21 and the boundary sheet portion 22 are provided integrally, they may be provided separately. In addition, if it is integral, position shift can be prevented, and if it is a separate body, the processing of the sheet can be simplified.

(その他の事項)
(1)上記実施の形態では、シリコン単結晶引上げ装置に使用される石英ルツボを保持するためのカーボン製ルツボを例示したけれども、本発明はガリウム等の金属単結晶引上げ装置に使用される石英ルツボを保持するためのカーボン製ルツボにも適用することができる。
(Other matters)
(1) In the above embodiment, the carbon crucible for holding the quartz crucible used in the silicon single crystal pulling apparatus is exemplified, but the present invention is a quartz crucible used in a metal single crystal pulling apparatus such as gallium. It can also be applied to carbon crucibles for holding

(2)カーボン製ルツボは、直胴部9が炭素繊維強化炭素材(C/C材)から成り、網状に織り込まれた網状体で構成されている場合(例えば、特開平02−116696号公報や特開2009−203093号公報に開示されている網状体)であってもよい。   (2) In the carbon crucible, when the straight body portion 9 is made of a carbon fiber reinforced carbon material (C / C material) and is composed of a net-like body woven in a net-like shape (for example, Japanese Patent Laid-Open No. 02-116696) Or a net-like body disclosed in JP2009-203093A.

本発明は、シリコン等の金属単結晶引上げ装置に使用される石英ルツボを保持するためのカーボン製ルツボに適用される。   The present invention is applied to a carbon crucible for holding a quartz crucible used in an apparatus for pulling a metal single crystal such as silicon.

1:単結晶引き上げ装置
4:石英ルツボ
5:カーボン製ルツボ
9:直胴部
10:受け皿部10
10a:受け皿部10の底部
10b:受け皿部10の曲面状部分(R部)
A:境界部分
A1:分割部分
40:黒鉛製分割片
21:受け皿シート部
22:境界シート部
1: Single crystal pulling device 4: Quartz crucible 5: Carbon crucible 9: Straight body 10: Saucepan 10
10a: bottom part of the saucer part 10 10b: curved surface part (R part) of the saucer part 10
A: Boundary portion A1: Divided portion 40: Divided piece made of graphite 21: Dish sheet portion 22: Boundary sheet portion

Claims (11)

直胴部と受け皿部とが分割されたカーボン製ルツボであって、
カーボン製ルツボの内面の、少なくとも直胴部と受け皿部との境界部分を覆うように、黒鉛質シートを配置したことを特徴とするカーボン製ルツボ。
A carbon crucible with a straight body part and a saucer part divided,
A carbon crucible, wherein a graphite sheet is disposed so as to cover at least a boundary portion between a straight body portion and a tray portion on the inner surface of a carbon crucible.
前記黒鉛質シートは膨張黒鉛シートである、請求項1記載のカーボン製ルツボ。   The carbon crucible according to claim 1, wherein the graphite sheet is an expanded graphite sheet. 前記黒鉛質シートは、その灰分が100ppm以下である、請求項1記載のルツボ保持部材。   The crucible holding member according to claim 1, wherein the graphite sheet has an ash content of 100 ppm or less. 前記直胴部は炭素繊維強化炭素複合材から成り、前記黒鉛質シートは、前記境界部に加えて、直胴部の内面全体を覆うように配置されている、請求項1記載のカーボン製ルツボ。   The carbon crucible according to claim 1, wherein the straight body portion is made of a carbon fiber reinforced carbon composite material, and the graphite sheet is disposed so as to cover the entire inner surface of the straight body portion in addition to the boundary portion. . 前記直胴部は複数に分割された黒鉛製分割片で構成され、前記黒鉛質シートは、前記境界部に加えて、直胴部の内面全体を覆うように配置されている、請求項1記載のカーボン製ルツボ。   The said straight body part is comprised by the division piece made from graphite divided | segmented into plurality, The said graphite sheet is arrange | positioned so that the whole inner surface of a straight body part may be covered in addition to the said boundary part. Carbon crucible. 前記受け皿部は、底部と、底部から前記直胴部に連なる曲面状部分とで構成され、前記黒鉛質シートは、前記境界部に加えて、直胴部の内面全体から前記曲面状部分まで一体に覆うように配置されている、請求項1記載のカーボン製ルツボ。   The tray portion is composed of a bottom portion and a curved portion extending from the bottom portion to the straight body portion, and the graphite sheet is integrated from the entire inner surface of the straight body portion to the curved portion in addition to the boundary portion. The carbon crucible of Claim 1 arrange | positioned so that it may cover. 前記黒鉛質シートは、カーボン製ルツボの内面を一体に覆うように配置されている、請求項1記載のカーボン製ルツボ。   The carbon crucible according to claim 1, wherein the graphite sheet is disposed so as to integrally cover an inner surface of the carbon crucible. 前記黒鉛質シートは、受け皿部内面を覆う平面円形状のシートと、直胴部内面を覆う筒状のシートが組み合わされ、両シートが境界部分で重ね合わされた構成である、請求項7記載のカーボン製ルツボ。   8. The graphite sheet according to claim 7, wherein a planar circular sheet covering the inner surface of the tray part and a cylindrical sheet covering the inner surface of the straight body part are combined, and both sheets are overlapped at a boundary part. Carbon crucible. 前記受け皿部は複数に分割された黒鉛製分割片で構成され、
前記黒鉛質シートは、前記分割片同士の突合せ部付近を覆う受け皿シート部と、前記境界部分を覆う境界シート部とを備えた、請求項7記載のカーボン製ルツボ。
The saucer portion is composed of a divided piece made of graphite divided into a plurality of pieces,
The carbon crucible according to claim 7, wherein the graphite sheet includes a tray sheet portion that covers the vicinity of the butting portion between the divided pieces, and a boundary sheet portion that covers the boundary portion.
前記黒鉛質シートは、複数枚を重ねた構成である、請求項1記載のカーボン製ルツボ。   The carbon crucible according to claim 1, wherein the graphite sheet has a configuration in which a plurality of sheets are stacked. 前記黒鉛質シートは、厚さが0.2〜1.0mm、かさ密度が0.7〜1.3g/cmである、請求項1記載のカーボン製ルツボ。
The carbon crucible according to claim 1, wherein the graphite sheet has a thickness of 0.2 to 1.0 mm and a bulk density of 0.7 to 1.3 g / cm 3 .
JP2010199233A 2010-09-06 2010-09-06 Carbon crucible Pending JP2012056783A (en)

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PCT/JP2011/069304 WO2012032948A1 (en) 2010-09-06 2011-08-26 Carbon crucible
KR1020137006344A KR20130138202A (en) 2010-09-06 2011-08-26 Carbon crucible
US13/820,796 US20130160703A1 (en) 2010-09-06 2011-08-26 Carbon crucible
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