WO2016002480A1 - MgO系セラミックス膜、半導体製造装置用部材及びMgO系セラミックス膜の製法 - Google Patents
MgO系セラミックス膜、半導体製造装置用部材及びMgO系セラミックス膜の製法 Download PDFInfo
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- WO2016002480A1 WO2016002480A1 PCT/JP2015/067031 JP2015067031W WO2016002480A1 WO 2016002480 A1 WO2016002480 A1 WO 2016002480A1 JP 2015067031 W JP2015067031 W JP 2015067031W WO 2016002480 A1 WO2016002480 A1 WO 2016002480A1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P50/00—Etching of wafers, substrates or parts of devices
- H10P50/20—Dry etching; Plasma etching; Reactive-ion etching
- H10P50/24—Dry etching; Plasma etching; Reactive-ion etching of semiconductor materials
- H10P50/242—Dry etching; Plasma etching; Reactive-ion etching of semiconductor materials of Group IV materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32458—Vessel
- H01J37/32477—Vessel characterised by the means for protecting vessels or internal parts, e.g. coatings
- H01J37/32495—Means for protecting the vessel against plasma
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- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P95/00—Generic processes or apparatus for manufacture or treatments not covered by the other groups of this subclass
- H10P95/90—Thermal treatments, e.g. annealing or sintering
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W99/00—Subject matter not provided for in other groups of this subclass
Definitions
- the present invention relates to a MgO-based ceramic film, a member for a semiconductor manufacturing apparatus, and a method for producing a MgO-based ceramic film.
- a halogen-based plasma such as F or Cl having high reactivity or corrosiveness is used for etching or cleaning.
- High corrosion resistance is required for members assembled in such a semiconductor manufacturing apparatus. These materials are required to have high corrosion resistance because corrosion progresses gradually with long-term use and causes contamination to semiconductors due to dust generation and the like.
- materials having high corrosion resistance alumina, aluminum nitride, yttria and the like are known and have been applied to semiconductor manufacturing equipment.
- materials having high corrosion resistance for example, those described in Patent Documents 1 and 2 are known.
- Patent Document 1 the main component is a ceramic sprayed coating spinel formed of MgO and Al 2 O 3, the weight ratio of MgO and Al 2 O 3 (MgO / Al 2 O 3) 0.25 to 1
- Patent Document 2 is a spinel ceramic material containing MgO and Al 2 O 3 as main components, and the composition ratio of MgO and Al 2 O 3 is in the range of 1 to 2.33 in weight ratio, and There is disclosed a corrosion-resistant ceramic material characterized in that the average particle size of crystal particles is less than 3 ⁇ m.
- the Patent Document 2 describes that when the weight ratio exceeds 2.33, the amount of MgO is too large and the corrosion resistance is lowered.
- Patent No. 5188898 Patent No. 4368021 gazette
- the present invention has been made to solve such problems, and its main object is to provide a MgO-based ceramic film having high corrosion resistance.
- the present inventors mixed MgO and Al 2 O 3 in various proportions to form granules, and then heat treated at a predetermined temperature as a raw material for thermal spraying, and MgO material obtained by thermally spraying this raw material for thermal spraying
- MgO material obtained by thermally spraying this raw material for thermal spraying
- MgO and Al 2 O 3 are granulated as raw materials for thermal spraying and then heat treated at 1200 ° C. or higher to prepare the thermal spraying raw materials on a predetermined substrate. By doing this, the above-mentioned MgO-based ceramic film is manufactured.
- the elements on larger scale of FIG. The XRD peak enlarged view of the sprayed film of Experimental example 7-1.
- MgO-based ceramic film refers to a compound in which the mass% of MgO is the largest among the compounds contained in the ceramic film, and for example, the one in which MgO exceeds 50 mass%.
- the MgO-based ceramic film of the present invention is excellent in corrosion resistance. It is considered that the reason is that the water absorptivity of the MgO-based ceramic film of the present invention is lower than that of the MgO-based ceramic film.
- the high angle side By shifting to the high angle side, the solid solution amount of Al is increased, and the water resistance of MgO is improved.
- the MgO-based ceramic film of the present invention may have a new diffraction peak or a shoulder on the high angle side of the diffraction peak of the MgO (200) surface in the XRD measurement when using a CuK ⁇ ray.
- This new diffraction peak or shoulder is considered to be derived from MgO whose crystal structure is the same and the lattice constant is changed by further solid solution of Al, and is thermodynamically non-equilibrium, for example, quenched by thermal spraying It is considered to be generated by passing through the state.
- this new diffraction peak or shoulder becomes peak-separable, the corrosion resistance tends to decrease, so it is preferable that it appears as a shoulder that can not be seen at all or can not be peak-separated.
- this new diffraction peak or shoulder is considered to improve the properties of low water resistance MgO by solid solution of Al in MgO.
- the mass ratio MgO / Al 2 O 3 of MgO and Al 2 O 3 in the oxide conversion of Mg and Al be greater than 2.33.
- the mass ratio is 2.33 or less, the corrosion resistance tends to decrease, so the mass ratio is preferably larger than 2.33.
- the MgO-based ceramic film of the present invention is preferably a sprayed film.
- the thermal spraying method is not particularly limited as long as the raw material for thermal spraying is melted, and examples thereof include a plasma radiation method, a gas type thermal spraying method, a gas explosion thermal spraying method and the like.
- the MgO-based ceramic film of the present invention has a new diffraction peak or shoulder (see below) which is higher than the diffraction peak of the MgO (200) plane (hereinafter referred to as the diffraction peak (A)) and the diffraction peak of the MgO (200) plane.
- the peak height ratio I B / I A with the diffraction peak (B) is preferably 0.33 or less, and more preferably less than 0.22. Since the crystalline phase of the diffraction peak (B) is considered to be generated through thermodynamic non-equilibrium state, its crystallinity is expected to be low, and corrosion resistance is also expected to be low. . However, since Al is solid-solved in the MgO crystal, it may be present to such an extent that the corrosion resistance is not adversely affected from the viewpoint of maintaining water resistance.
- the peak height ratio I C / (diffraction peaks (A), (B)) and the diffraction peak of the (220) plane of MgAl 2 O 4 (hereinafter referred to as diffraction peak (C)) 0.2 or less is preferable and, as for I A + I B , 0.1 or less is more preferable.
- the porosity of the MgO-based ceramic film of the present invention is preferably 20% or less, more preferably 15% or less, and still more preferably 13% or less.
- the porosity may be determined from the area ratio of the membrane to the pores by image processing of a cross-sectional photograph of the membrane. If the true density of the film is known, the porosity of the film can also be determined by the Archimedes method. Besides this, any method may be used as long as porosity can be obtained.
- the porosity is preferably as close to zero as possible. For this reason, there is no lower limit value in particular.
- the MgO-based ceramic film of the present invention can be used as a film covering the surface of a member for a semiconductor manufacturing apparatus.
- the member for a semiconductor manufacturing apparatus include an electrostatic chuck, a susceptor, a heater, a plate, a chamber, an inner wall material, a monitoring window, a microwave introduction window, an antenna for microwave coupling, and the like. These are preferably coated with the MgO-based ceramic film of the present invention because they require excellent corrosion resistance to plasma of a corrosive gas containing a halogen element.
- the process for producing the MgO-based ceramic film according to the present invention comprises preparing MgO and Al 2 O 3 as granular materials and then heat treating at 1200 ° C. or higher to prepare the material and thermally spraying the material for thermal spraying on a predetermined substrate. It can be obtained by The raw material for thermal spraying is obtained by heat treating granules of MgO and Al 2 O 3, and contains MgO and MgAl 2 O 4 as a crystal phase. Such a raw material for thermal spraying is in a state in which MgO and MgAl 2 O 4 are in good contact with each other, and Al is dissolved in MgO and MgO is more than in the case of using only a mixture of MgO and MgAl 2 O 4.
- the remaining MgO-based ceramic film can be relatively easily manufactured.
- the thermal spraying method is not particularly limited as long as the raw material for thermal spraying is melted, and examples thereof include plasma thermal spraying, gas thermal spraying, and gas explosion thermal spraying.
- the plasma gas is not particularly limited, but argon, helium, nitrogen, hydrogen, oxygen, and a plurality of combinations thereof can be used.
- the thermal spraying conditions are not particularly limited, and may be appropriately set in accordance with the raw material for thermal spraying, the type of the substrate on which the film is to be formed, and the like.
- Experimental Examples 1 to 9 are specific examples of the raw material for thermal spraying, and Experimental Examples 1-1 to 9-1 are specific examples of the thermal sprayed film. Among these, Experimental Examples 1-1 to 7-1 correspond to Examples, and Experimental Examples 8-1 to 9-1 correspond to Comparative examples.
- the mixed slurry was sprayed using a spray dryer to produce granules. Such granules are referred to as "SD granules". Thereafter, heat treatment was performed at 1600 ° C. in the air.
- the obtained heat-treated powder was subjected to vibration sieving with a sieve of 75 ⁇ m, and the raw material obtained under the sieve was used as a raw material for thermal spraying.
- the MgO / Al 2 O 3 of Experimental Example 4 was obtained by crushing a commercially available MgO raw material (particle size (D50) 34 ⁇ m) and commercially available MgAl 2 O 4 (particle size (D 50) about 4 ⁇ m). After preparing the SD granules in the same manner as in the ratio and preparing the SD granules in the same manner as in Experimental Examples 1 to 7, those which were not heat-treated were used as the raw materials for thermal spraying. In Experimental Example 9, the commercially available MgO raw material alone used in Experimental Example 8 was used as a raw material for thermal spraying.
- Experimental Examples 1-1 to 9-1 Preparation of thermal sprayed film
- An aluminum substrate with Ra> 1 ⁇ m was prepared as a thermal spraying substrate.
- the thermal spraying raw materials obtained in Experimental Examples 1 to 9 were subjected to plasma spraying on the thermal spraying substrates under the conditions shown in Table 2 in the air atmosphere.
- Experimental Example N is an integer of 1 to 9
- the sprayed film thus produced is referred to as Experimental Example N-1.
- a sprayed coating having a thickness of 30 to 210 ⁇ m was obtained.
- the raw material for thermal spraying of Experimental Example 8 was used, a sprayed film thinner than those of Experimental Examples 1 to 7 was obtained, and the number of times of thermal spraying was increased to obtain a sprayed film having a thickness of 30 ⁇ m.
- each peak height was calculated
- the crystal phase of each sprayed film, the peak top position of the diffraction angle of the MgO (200) plane, and the height of the diffraction peaks (A) to (C) are shown in Table 2.
- the diffraction peaks (A) to (C) will be described later.
- 2) Component analysis The obtained sprayed film was peeled off from the substrate, powdered in a mortar, and subjected to chemical analysis. After dissolving the sample, Mg and Al were quantified by the chelate titration method. The results are shown in Table 2.
- the obtained image is first converted to 16-bit grayscale (multiplication scaling) using an image analysis software (Image-Pro Plus 7.0J manufactured by Media Cybernetics), and then binarized to obtain a film.
- the porosity was calculated.
- the threshold for binarization was set using Otsu's binarization as a discriminant analysis method.
- FIG. 2 shows an XRD analysis chart of Experimental Example 4-1
- FIG. 3 shows an enlarged view thereof
- FIG. 4 shows an XRD peak enlarged view of Experimental Example 7-1.
- the sprayed film of Experimental Example 4-1 was made of MgO and magnesium aluminum oxide (MgAl 2 O 4 ).
- the sprayed films other than those of Experimental Example 1-1 to Experimental Example 8-1 were similarly made of MgO and MgAl 2 O 4 . Further, from FIGS.
- the diffraction peaks (hereinafter referred to as diffraction peaks (A)) of the MgO (200) planes of Experimental Examples 4-1 and 7-1 are higher on the high angle side than MgO (ICDD 78-0430). Peak shift was confirmed. Although not shown, it was confirmed that the other experimental examples of Experimental Examples 1-1 to 7-1 also peak-shifted to the high angle side as shown in Table 2.
- a new diffraction peak (hereinafter referred to as a diffraction peak (B)) not found in the raw material is present between the MgAl 2 O 4 (400) plane and the MgAl 2 O 4 (400) plane on the high angle side of the MgO (200) plane. I confirmed that I could see it.
- the enlarged peak of the MgO (220) plane of Experimental Example 7-1 is shown in FIG. It was confirmed that a diffraction peak not seen in the raw material was observed on the high angle side of the MgO (220) plane as in the case of the MgO (200) plane.
- the MgO (111) plane the (311) plane of MgAl 2 O 4 and the diffraction peak position were very close to each other, so the peaks could not be separated, and no clear peak on the high angle side could be confirmed.
- this new diffraction peak (B) has a lattice constant different from the diffraction peak (A), but has the same crystal structure as MgO. It was found to be a substance possessed.
- Experimental Example 4-1 of FIG. 3 a shoulder is slightly seen on the high angle side of the diffraction peak of the MgO (200) plane, and a crystal phase having the same crystal structure as MgO as in Experimental Example 7-1.
- Table 2 summarizes the height of the diffraction peak (B).
- Diffraction peaks (B) were confirmed in all cases, but some samples could not be clearly separated.
- Table 2 also shows the peak height when the diffraction peak of the (220) plane of MgAl 2 O 4 (hereinafter referred to as the diffraction peak (C)) is used.
- EPMA measurement it was found that it mainly consists of a part containing a small amount of Al in Mg and O and a part containing a larger amount of Al than this.
- the former is considered to be MgO
- the latter is considered to be MgAl 2 O 4.
- Al is solid-solved in MgO according to the result of the XRD measurement.
- a phase is also confirmed in which Al is contained in a larger amount than the amount of Al in MgO in which Al is solid-dissolved, and in a smaller amount than the amount of Al in MgAl 2 O 4. This corresponds to the portion corresponding to the diffraction peak (B) It was suggested.
- Table 2 shows the results of chemical analysis of the sprayed film, and the mass ratio of MgO to Al 2 O 3 (MgO / Al 2 O 3 ) when converted into oxides of Mg and Al obtained therefrom.
- the mass ratio was larger than 2.33 and in the experimental examples 6-1 to 7-1, the ratio was 2.33 or less.
- Table 2 shows the results of the etching rates of the sprayed films of Experimental Examples 1-1 to 7-1. All the sprayed films had small etching rates and high corrosion resistance. Among them, the experimental examples 1-1 to 5-1 have smaller etching rates than the experimental examples 6-1 to 7-1. From this, it was found that the corrosion resistance is improved by setting the mass ratio of MgO to Al 2 O 3 (MgO / Al 2 O 3 ) larger than 2.33.
- Example 2-1 As for the porosity of the sprayed film, 14.5% in Example 2-1, 12.7% in Example 4-1, 8.1% in Example 6-1, and 7% in Example 7-1. .3%.
- the weight loss per area (mg / cm 2 ) by TG-DTA measurement is shown in Table 2.
- the weight loss of Experimental Examples 1-1 to 7-1 is smaller than 1.5 mg / cm 2, which is the weight loss of the MgO sintered body not described in Table 2. It was found that the water absorption is lower than that of MgO, that is, the water resistance is excellent.
- the present invention is applicable to, for example, a semiconductor manufacturing apparatus used for a dry process or plasma coating in semiconductor manufacturing.
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Abstract
Description
(溶射用原料の作製)
実験例1~7の溶射用原料は、以下の方法で作製した。まず、MgO原料(純度99.9質量%以上、粒度(D50)3μm以下)、Al2O3原料(純度99.9質量%以上、粒度(D50)1μm以下)を表1に示す質量%となるように秤量し、粉末30質量%、水70質量%、また粉末に対し1質量%の分散剤(ユケン工業製セランダー)となるように水と分散剤を加えた。玉石を直径20mmの鉄芯入ナイロンボールとして、ナイロン製のポットでこれらを湿式混合した。混合後したスラリーを、スプレードライヤーを用いて噴霧し、顆粒を作製した。このような顆粒を「SD顆粒」と称する。その後、大気雰囲気1600℃で熱処理した。得られた熱処理粉末を目開き75μmの篩で振動篩を行い、篩下に得られた原料を溶射用原料とした。
1)XRD測定
X線回折装置により結晶相を同定した。測定条件はCuKα、40kV、40mA、2θ=10-70°とし、封入管式X線回折装置(ブルカー・エイエックスエス製 D8 ADVANCE)を使用した。測定のステップ幅は0.02°とし、ピークトップの回折角を特定するためNIST製Si標準試料粉末(SRM640C)を添加し、ピーク位置を補正した。その結果を表1に示す。
2)粒度分布
得られた溶射用原料の粉末について粒度分布を求めた。測定は日機装製MicrotracMT3300EX IIで行い、累積粒径で10%(D10)と90%(D90)を求めた。その結果を表1に示す。
3)SEM観察
得られた溶射用原料についてSEM観察を行った。
実験例2の溶射用原料のXRD測定結果を図1に示す。図1から、結晶相はMgOとMgAl2O4からなることがわかった。図示はしていないが、実験例1,3~8についても同様であった。SEM観察を行ったところ、実験例1~7については元のMgO及びAl2O3原料よりも一次粒径が大きくなりつつ、粒子同士のネックがつながっており、熱処理によりMgOとAl2O3が反応してMgOとMgAl2O4を生成しつつ、一部焼結が進んでMgOとMgAl2O4の接触が良好になったことが確認された。一方、実験例8においてはMgOとMgAl2O4の粒成長は見られず、粒子同士のネックがつながっている様子は見られなかった。
(溶射膜の作製)
溶射用基板としてRa>1μmのアルミニウム基板を用意した。実験例1~9で得られた溶射用原料を大気雰囲気で表2に示す条件にて溶射用基板にプラズマ溶射を実施した。
1)XRD測定
X線回折装置により結晶相を同定した。得られた溶射膜を基板より剥がし、乳鉢にて粉砕して粉末状とした。測定条件はCuKα、40kV、40mA、2θ=10-70°とし、封入管式X線回折装置(ブルカー・エイエックスエス製 D8 ADVANCE)を使用した。測定のステップ幅は0.02°とし、ピークトップの回折角を特定するためNIST製Si標準試料粉末(SRM640C)を添加し、ピーク位置補正した。ICDD78-0430で示されるMgO(111)面、(200)面、(220)面付近にそれぞれ回折ピークが検出されることを確認したあと、各溶射膜のMgO(200)面の回折角のピークトップの位置を求めた。また、市販のソフトウェアMDI社製JADE7のピークサーチ機能から各ピーク高さを求めた。JADE7のピークサーチ条件は、フィルタタイプについては可変、放物線フィルタ、ピーク位置決定についてはピークトップ、しきい値と範囲については、しきい値σ=3.0、ピーク強度%カットオフ=0.1、BG決定の範囲=1.0、BG平均化のポイント数=7とし、Kα2ピークを消去ON、現存のピークリストを消去ONとした。各溶射膜の結晶相、MgO(200)面の回折角のピークトップ位置、回折ピーク(A)~(C)の高さを表2に示す。なお、回折ピーク(A)~(C)については後述する。
2)成分分析
得られた溶射膜を基板より剥がし、乳鉢にて粉末にし、化学分析を行った。試料を溶解させたあと、Mg及びAlをキレート滴定法にて定量した。結果を表2に示す。
3)耐食性試験
得られた溶射膜の表面を鏡面研磨し、一部マスクをしてICPプラズマ耐食試験装置を用いて下記条件の耐食試験を行った。段差計により測定したマスク面と暴露面との段差を試験時間で割ることにより各材料のエッチングレートを算出した。結果を表2に示す。
ICP:800W、バイアス:450W、導入ガス:NF3/O2/Ar=75/35/140sccm 0.05Torr、暴露時間:5h、試料温度:室温
4)吸水性試験
実験例1-1~7-1について、溶射膜を基板から剥がし30℃95%湿度環境下で4日間保管した後、TG-DTAにて大気500℃まで加熱して重量減を求めた。結果を表2に示す。MgOについては溶射膜が得られなかったことから、市販のMgO粉末をプレス成形し、1600℃で熱処理した後、厚み約200μmにしたものを溶射膜と仮定して同様の方法で重量減を求めた。得られた重量減を溶射膜(MgOについては焼結体の膜面)の片側の面積で換算した。値を表2に示す。
5)構成元素
実験例1-1~7-1の溶射膜断面を真空脱泡しながらエポキシ樹脂中に埋めこみエポキシ樹脂を固化させた後に鏡面研磨を行い、EPMAを用いて構成元素の検出及び同定を行った。
6)気孔率
溶射膜を樹脂(エポキシ樹脂)に包埋することにより溶射膜の気孔を樹脂で埋めた後、溶射膜の断面を切り出して研磨し、その後SEM(走査型電子顕微鏡)にて溶射膜断面のSEM画像を取得した。SEM画像は、倍率500倍、712×532ピクセルの画像とした。得られた画像は、画像解析ソフト(Media Cybernetics社製 Image-Pro Plus 7.0J)を用いて、まず16ビットグレイスケールに変換した後(乗算でスケーリング)、2値化処理を行い、膜の気孔率を算出した。2値化する際のしきい値は、判別分析法として大津の2値化を用いて設定した。
実験例1-1~8-1の溶射膜をXRD測定したところ、MgO(200)面を含め、ICDD78-0430で示されるMgO付近に回折ピークが検出されること、またマグネシウムアルミニウム酸化物(MgAl2O4)が検出されることを確認した。
Claims (7)
- MgOにAlが固溶しており、CuKα線を用いたときのXRD測定においてMgO(200)面の回折ピークが2θ=42.92°よりも高角側にシフトしており、結晶相としてMgOとMgAl2O4を含む、MgO系セラミックス膜。
- 前記XRD測定において、MgO(200)面の回折ピークは高角側に回折ピーク、又はショルダーを有している、
請求項1に記載のMgO系セラミックス膜。 - MgとAlを酸化物換算した際のMgOとAl2O3の質量比MgO/Al2O3が2.33より大きい、
請求項1又は2に記載のMgO系セラミックス膜。 - 気孔率が20%以下である、
請求項1~3のいずれか1項に記載のMgO系セラミックス膜。 - 溶射膜である、
請求項1~4のいずれか1項に記載のMgO系セラミックス膜。 - 請求項1~5のいずれか1項に記載のMgO系セラミックス膜で表面が覆われた、半導体製造装置用部材。
- 溶射用原料としてMgOとAl2O3を顆粒状にした後1200℃以上で熱処理したものを作製し、該溶射用原料を所定の基板に溶射することにより請求項5に記載のMgO系セラミックス膜を製造する、
MgO系セラミックス膜の製法。
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| JP2016531233A JP6634371B2 (ja) | 2014-06-30 | 2015-06-12 | MgO系セラミックス膜、半導体製造装置用部材及びMgO系セラミックス膜の製法 |
| KR1020167035783A KR102059092B1 (ko) | 2014-06-30 | 2015-06-12 | MgO계 세라믹스막, 반도체 제조 장치용 부재 및 MgO계 세라믹스막의 제법 |
| US15/386,235 US11152195B2 (en) | 2014-06-30 | 2016-12-21 | MgO-based ceramic film, member for semiconductor manufacturing apparatus, and method for forming MgO-based ceramic film |
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| WO2012056875A1 (ja) * | 2010-10-25 | 2012-05-03 | 日本碍子株式会社 | セラミックス材料、積層体、半導体製造装置用部材及びスパッタリングターゲット部材 |
| WO2012056876A1 (ja) * | 2010-10-25 | 2012-05-03 | 日本碍子株式会社 | セラミックス材料、半導体製造装置用部材、スパッタリングターゲット部材及びセラミックス材料の製造方法 |
| JP2012232871A (ja) * | 2011-04-28 | 2012-11-29 | Daiichi Kigensokagaku Kogyo Co Ltd | スピネル粉末およびその製造方法、溶射膜の製造方法、ならびにガスセンサ素子の製造方法 |
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| JPS5188898A (ja) | 1975-01-31 | 1976-08-03 | ||
| JPH0455360A (ja) * | 1990-06-22 | 1992-02-24 | Tokai Carbon Co Ltd | マグネシア質超高温耐火物 |
| JPH07126061A (ja) * | 1993-09-10 | 1995-05-16 | Kounoshima Kagaku Kogyo Kk | マグネシア系焼結体及びその製造方法 |
| JP3475258B2 (ja) * | 1994-05-23 | 2003-12-08 | 株式会社海水化学研究所 | セラミック被膜形成剤およびその製造方法 |
| US6376405B1 (en) * | 1998-02-11 | 2002-04-23 | Akzo Nobel N.V. | Process for producing anionic clay using two types of alumina compounds |
| JP4641569B2 (ja) * | 1998-07-24 | 2011-03-02 | 日本碍子株式会社 | 窒化アルミニウム質焼結体、耐蝕性部材、金属埋設および半導体保持装置 |
| JP4368021B2 (ja) | 2000-01-18 | 2009-11-18 | 太平洋セメント株式会社 | 耐蝕性セラミックス材料 |
| EP1247941A1 (de) * | 2001-04-03 | 2002-10-09 | Siemens Aktiengesellschaft | Gasturbinenschaufel |
| US20080213496A1 (en) * | 2002-02-14 | 2008-09-04 | Applied Materials, Inc. | Method of coating semiconductor processing apparatus with protective yttrium-containing coatings |
| CA2548500C (en) * | 2003-12-05 | 2010-01-12 | Intercat, Inc. | Mixed metal oxide sorbents |
| JP5188898B2 (ja) * | 2008-07-11 | 2013-04-24 | 太平洋セメント株式会社 | セラミックス溶射膜及びそれを用いた耐食性部材 |
| WO2013155518A1 (en) * | 2012-04-13 | 2013-10-17 | Sasol Olefins & Surfactants Gmbh | Process for the synthesis of magnesium aluminate spinels |
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| WO2012056875A1 (ja) * | 2010-10-25 | 2012-05-03 | 日本碍子株式会社 | セラミックス材料、積層体、半導体製造装置用部材及びスパッタリングターゲット部材 |
| WO2012056876A1 (ja) * | 2010-10-25 | 2012-05-03 | 日本碍子株式会社 | セラミックス材料、半導体製造装置用部材、スパッタリングターゲット部材及びセラミックス材料の製造方法 |
| JP2012232871A (ja) * | 2011-04-28 | 2012-11-29 | Daiichi Kigensokagaku Kogyo Co Ltd | スピネル粉末およびその製造方法、溶射膜の製造方法、ならびにガスセンサ素子の製造方法 |
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