WO2016133220A1 - 発熱体及びその製造方法 - Google Patents
発熱体及びその製造方法 Download PDFInfo
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- WO2016133220A1 WO2016133220A1 PCT/JP2016/054969 JP2016054969W WO2016133220A1 WO 2016133220 A1 WO2016133220 A1 WO 2016133220A1 JP 2016054969 W JP2016054969 W JP 2016054969W WO 2016133220 A1 WO2016133220 A1 WO 2016133220A1
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- H—ELECTRICITY
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- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/148—Silicon, e.g. silicon carbide, magnesium silicide, heating transistors or diodes
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- C23C10/06—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases
- C23C10/08—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases only one element being diffused
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- C23C12/00—Solid state diffusion of at least one non-metal element other than silicon and at least one metal element or silicon into metallic material surfaces
- C23C12/02—Diffusion in one step
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/24—Deposition of silicon only
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/448—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials
- C23C16/452—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials by activating reactive gas streams before their introduction into the reaction chamber, e.g. by ionisation or addition of reactive species
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/46—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for heating the substrate
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- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/02—Pretreatment of the material to be coated
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- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
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- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/34—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in more than one step
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- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/54—Heating elements having the shape of rods or tubes flexible
Definitions
- the present invention relates to a heating element and a method for manufacturing the same.
- the heating element CVD method is known as one of the film forming methods.
- the heating element CVD method is also referred to as a Cat-CVD method or a hot wire CVD method, and decomposes by bringing a source gas into contact with a heated heating element and undergoes a reaction process directly or in a gas phase.
- This is a method of depositing as a thin film on the surface of an object to be deposited (see, for example, Patent Document 1).
- Metal tantalum is widely used as a heating element.
- metallic tantalum has low creep strength at high temperatures and poor durability. It is known that durability is enhanced by carbonizing the surface of metal tantalum.
- a tantalum wire made of tantalum carbide is formed on the surface of the tantalum wire by installing a tantalum wire made of tantalum in the chamber, introducing a carbon source into the chamber, and energizing and heating the tantalum wire. (For example, refer to Patent Document 2).
- a method of forming a tantalum carbide from a tantalum surface by removing a natural oxide film formed on the tantalum surface in a vacuum heat treatment furnace and then performing heat treatment by introducing a carbon source into the vacuum heat treatment furnace.
- Fully carbonized tantalum wire has the disadvantage that it is so fragile that it cannot be manipulated in general with physical contact. By converting at least part of the tantalum to tantalum carbide, it is easy to handle. (For example, see Patent Document 4).
- An object of the present invention is to provide a highly durable heating element and a method for manufacturing the same.
- a heating element according to the present invention includes a first layer having a metal tantalum phase, and a second layer covering the periphery of the first layer and having a tantalum carbide phase, and the first layer and the first layer
- the silicon concentration in the interface with the two layers is higher than the silicon concentration in the portion other than the interface.
- the silicon concentration in the inner peripheral portion of the second layer is preferably larger than the silicon concentration in a portion other than the inner peripheral portion.
- the ratio of the sectional area of the first layer to the sectional area of the heating element is preferably 0.07 or more and 0.64 or less.
- the heating element manufacturing method includes an installation step in which a base material mainly composed of tantalum is installed in a vacuum chamber, and a silicon-containing hydrocarbon gas is introduced into the vacuum chamber and installed in the vacuum chamber. Heating the base material, and introducing a silicon atom into the base material from the outer surface of the base material.
- the base material is linear or ribbon-shaped, and the base material installed in the vacuum chamber is energized and heated in the heating step.
- the base material in the heating step, is preferably heated at a temperature of 1600 ° C. or higher and lower than 2400 ° C.
- the present invention can provide a highly durable heating element and a method for manufacturing the same.
- FIG. 6 is a photograph showing a state of a heating element after repeated film formation. It is a cross-sectional state of a heating element and a SIMS analysis result. It is a cross-sectional state of the heat generating body of Example 4, and a SIMS analysis result.
- FIG. 1 is a cross-sectional view showing an example of a heating element according to the present embodiment in a direction perpendicular to the direction in which carburization proceeds.
- the direction perpendicular to the direction in which carburization proceeds is a cross-sectional view in the diameter direction of the wire when the heating element is a wire.
- the heating element 1 according to the present embodiment includes a first layer 2 having a metal tantalum phase, and a second layer 3 covering the periphery of the first layer 2 and having a tantalum carbide phase.
- the silicon concentration at the interface portion 4 between the second layer 3 and the second layer 3 is higher than the silicon concentration at portions other than the interface portion 4.
- a heating element that can withstand long-term and / or repeated heat generation can be obtained.
- the presence of each layer can be identified by a sudden change in the concentration of carbon, and can be simply identified by the contrast in the observation image of a scattering electron microscope (SEM) or transmission electron microscope (TEM).
- the first layer 2 is the central part (core part) of the heating element 1 and has a metal tantalum phase.
- the first layer 2 is a layer containing more metal tantalum phase than tantalum carbide phase.
- the metal tantalum phase is, for example, tantalum, a tantalum-based alloy, or tantalum or a tantalum-based alloy containing an additive.
- the metal that forms an alloy with tantalum in the tantalum-based alloy is preferably at least one of tungsten, niobium, iridium, chromium, hafnium, and molybdenum, for example.
- the tantalum-based alloy preferably contains 80 atomic% or more of tantalum.
- the additive contained in tantalum or a tantalum-based alloy is, for example, an oxide such as zirconia or yttria, calcia, or silica. The addition amount of the additive is preferably 1% by mass or less.
- the ratio of the sectional area of the first layer 2 to the sectional area of the heating element 1 is preferably 0.07 or more and 0.64 or less.
- the heat generating body 1 is carburized moderately and durability can be improved more. Further, it is possible to reduce the thermal deformation of the heating element when heated, and to impart mechanical strength to the heating element that can be detached from other mechanical parts and electrical parts by physical contact. If it is less than 0.07, the flexibility of the heating element is impaired and handling may be difficult. If it exceeds 0.64, it may be slightly deformed depending on the number of repetitions. More preferably, it is 0.07 or more and 0.47 or less. More preferably, it is 0.07 or more and 0.24 or less.
- the cross section of the heating element 1 is a surface cut by a plane orthogonal to the axial direction (longitudinal direction) of the heating element 1.
- the second layer 3 is a peripheral portion of the heating element 1 and has a tantalum carbide phase.
- the second layer 3 is a layer containing more tantalum carbide phase than metal tantalum phase.
- the second layer 3 may have a Ta 2 C layer and a TaC layer in order from the first layer 2 side toward the outside.
- the Ta 2 C layer is a layer containing more Ta 2 C than TaC.
- the TaC layer is a layer containing more TaC than Ta 2 C.
- the Ta 2 C layer and the TaC layer preferably have a gradient composition.
- the interface part 4 is an area composed of the outer peripheral part 2 a of the first layer 2 and the inner peripheral part 3 a of the second layer 3.
- the outer peripheral portion 2a of the first layer 2 divides the distance from the center O of the first layer 2 to the interface between the first layer 2 and the second layer 3 over the entire circumference n (n is When the first layer 2 is divided into n regions, the region is closest to the second layer 3 side.
- the inner peripheral portion 3a of the second layer 3 divides the distance from the interface between the first layer 2 and the second layer 3 to the outer surface of the second layer 3 equally over the entire circumference (n Is an area that is closest to the outer surface of the second layer 3 when the second layer 3 is divided into n areas.
- n may be 2 (shown in FIG. 1), or 3 or more.
- the shape of the heating element 1 is not particularly limited, and is, for example, a linear shape, a ribbon shape, or a plate shape.
- the cross-sectional shape of the heating element 1 is not particularly limited, and may be, for example, an elliptical shape or a rectangular shape in addition to the circular shape shown in FIG.
- the heating element 1 preferably contains tantalum, carbon and silicon as constituent elements. Silicon is mainly present at the interface 4.
- the silicon concentration at the interface portion 4 is higher than the silicon concentration at portions other than the interface portion 4. Since the silicon concentration at the interface 4 is relatively high, the degree of thermal deformation of the heating element 1 can be reduced. It is possible to improve the durability against the extension of the use time and / or the delamination between layers and the generation of voids during repeated use. Further, when the silicon concentration in the outer peripheral portion 2 a of the first layer 2 in the interface portion 4 is compared with the silicon concentration in the inner peripheral portion 3 a of the second layer 3, the silicon concentration in the inner peripheral portion 3 a of the second layer 3 is greater. However, it is preferable that the silicon concentration in the outer peripheral portion 2a of the first layer 2 is larger.
- FIG. 1 When a heating element partially carbonized with a hydrocarbon gas such as methane is used as in Patent Document 2 or 3, when the heating time is extended, and / or the temperature of the heating element is increased or decreased by repeating the film formation process. When it is repeated, in a specific temperature range (1600 ° C. or higher), a very small amount of O 2 (including H 2 O derived) in the chamber penetrates into the inside of the heating element, the strength decreases due to oxidative degradation, and it deforms greatly. In some cases, the film cannot be used for film formation.
- the heating element 1 according to the present embodiment, a large amount of silicon is present at the interface 4, so that O 2 that has entered the heating element is combined with Si to form SiO 2 and the outside of the heating element 1. To be discharged. As a result, oxidative deterioration of the heating element 1 can be prevented.
- the thermal expansion coefficient of tantalum carbide and metal tantalum is different.
- the temperature is repeatedly raised and lowered, peeling or voids may occur near the interface between tantalum carbide and metal tantalum.
- the heating element 1 according to the present embodiment since Si is interposed in the vicinity of the interface between tantalum carbide and metal tantalum, the change in the coefficient of thermal expansion in the vicinity of the interface becomes gentle, and in the vicinity of the interface. Generation of peeling or peeling can be prevented. This effect cannot be obtained by simply changing the concentration of carbon element at the interface between tantalum carbide and metal tantalum, so that it significantly improves the durability of the heating element by interposing it in the vicinity of the Si interface. Contribute.
- the silicon concentration in the inner peripheral portion 3a of the second layer 3 is preferably larger than the silicon concentration in portions other than the inner peripheral portion 3a.
- the advantage of disposing high concentration silicon at the interface can be further enhanced.
- the element concentration in the heating element 1 can be confirmed by using, for example, secondary ion mass spectrometry (SIMS), Secondary Ion Mass Spectrometry.
- SIMS secondary ion mass spectrometry
- the heating element 1 may contain other elements other than tantalum, carbon, and silicon.
- the other element is, for example, hydrogen or oxygen.
- FIG. 2 is a schematic configuration diagram of a manufacturing apparatus used in the method for manufacturing a heating element according to the present embodiment.
- the heating element manufacturing apparatus 100 is a dedicated apparatus for manufacturing a heating element.
- the heating element manufacturing apparatus 100 will be described with reference to FIG.
- the heating element manufacturing apparatus 100 includes a vacuum chamber 46, an exhaust pump (not shown) for evacuating the vacuum chamber 46, a gas supply pipe 23 for supplying silicon-containing hydrocarbon gas into the vacuum chamber 46, and a heating element It has the electrode part 21 to which the base material 18 used as material is attached, and the heater power supply 20 which energizes the base material 18.
- the vacuum chamber 46 includes a top wall 42, a bottom wall 43 facing the top wall 42, and a side wall 44 connecting the top wall 42 and the bottom wall 43.
- the inside of the vacuum chamber 46 is a reaction chamber 12 for accommodating the base material 18 and forming a heating element.
- An exhaust pipe 22 is attached to the top wall 42 via a vacuum valve 48, and the air in the reaction chamber 12 is exhausted by an exhaust pump (not shown).
- the vacuum chamber 46 is arranged such that the top wall 42 is on the top and the bottom wall 43 is on the bottom.
- the arrangement is not limited to this.
- the top wall 42 is on the bottom and the bottom wall 43 is on the bottom wall 43. You may arrange
- the gas supply pipe 23 has a gas flow path 17 and a gas outlet 11 communicating with the gas flow path 17 and is disposed in the reaction chamber 12.
- the gas outlet 11 is, for example, a bottom side gas outlet 11x that jets gas toward the bottom wall 43 or a side gas outlet 11y that jets gas toward the side wall 44 of the reaction chamber 12.
- the gas supply port 16 is shown in FIG. 2 as an example provided on the top wall 42, but the present invention is not limited to this, and may be provided on the bottom wall 43 or the side wall 44 (not shown).
- the gas is supplied from the cylinder to the gas supply port 16 through the gas flow rate regulator 24 a and the valve 25 a, and is ejected from the gas ejection port 11 through the gas flow path 17.
- FIG. 2 shows a form in which one gas supply pipe 23 is arranged, the present invention is not limited to this, and a plurality of gas supply pipes 23 may be arranged.
- the electrode unit 21 is disposed in the reaction chamber 12.
- the electrode portion 21 is preferably arranged along the side surface of the gas supply pipe 23.
- the electrode unit 21 is electrically connected to the heater power source 20 through, for example, the electric wire 19.
- the heating device manufacturing apparatus 100 is not limited to the form shown in FIG. 2.
- a plurality of wires are used as the base material 18, and the plurality of wires are removed from the top wall 42. It is the form arrange
- a method for manufacturing a heating element will be described.
- tantalum and other components are processed into a heating element from an arrangement in which tantalum and other components are previously laminated on the base material, it is more rapid and economical to supply a silicon component as a gas component from the outside.
- a heating element having a layer can be manufactured.
- the base material 18 is a substance that becomes a material of the heating element.
- the shape of the base material 18 is appropriately selected according to the shape of the heating element. In FIG. 2, the form which the base material 18 is linear as an example was shown.
- the material of the base material 18 is, for example, tantalum, a tantalum-based alloy, or tantalum or a tantalum-based alloy containing an additive.
- the metal that forms an alloy with tantalum in the tantalum-based alloy is preferably at least one of tungsten, niobium, iridium, chromium, hafnium, and molybdenum, for example.
- the tantalum-based alloy preferably contains 80 atomic% or more of tantalum.
- the additive contained in tantalum or a tantalum-based alloy is, for example, an oxide such as zirconia or yttria, calcia, or silica. The addition amount of the additive is preferably 1% by mass or less.
- the substrate 18 is preferably disposed along the side surface of the gas supply pipe 23.
- the base material 18 is the side wall of the gas supply pipe 23. You may arrange
- the base material 18 is disposed along the side surface of the gas supply pipe 23 from the connection portion 26, turns at a predetermined location to form a return portion, and is returned toward the connection portion 26. Preferably they are arranged.
- the substrate 18 may be supported by a support member 35 made of an insulating material such as insulating ceramics provided on the outer periphery of the gas supply pipe 23.
- the predetermined pressure is preferably 100 Pa or less, more preferably 10 Pa or less, and even more preferably 1.5 Pa or less.
- the lower limit of the pressure in the vacuum chamber 46 is not particularly limited. When it exceeds 100 Pa, the heat resistance measures of the manufacturing apparatus tend to be excessive. In addition, dust generated in the heating process adheres to the heating element and the chamber and tends to cause trouble. These tendencies become more prominent as the temperature is lower.
- the pressure in the chamber is preferably 1 Pa or more. When the inside of the chamber is less than 1 Pa, the production time of the heating element tends to be long.
- the impure gas removing method is, for example, a method using a chamber having a surface roughness (Ra) of the inner wall surface within a predetermined range as the vacuum chamber 46, or a method of performing a so-called baking process in advance of the heating step.
- the surface roughness (Ra) per square mm of the inner wall surface of the vacuum chamber 46 is preferably 0.1 mm or less, and preferably 0.05 mm or less.
- the impure gas removal method is a process in which the vacuum chamber 46 is always kept under vacuum by using a known load lock system, and the substrate or the processed heating element is carried into and out of the vacuum chamber 46. It may be a method of managing the inside of the so as not to touch the atmosphere.
- At least one of silicon-containing hydrocarbons may be used alone or in combination of two or more.
- An inert gas such as argon or nitrogen may be used as a carrier gas, or a reducing gas such as hydrogen may be used as an additive gas.
- silicon-containing hydrocarbon examples include silicon tetrachloride, hexamethyldisilane, vinyltrimethylsilane, methylsilane, dimethylsilane, trimethylsilane, vinylsilane, diethylsilane, propylsilane, phenylsilane, methyltriethoxysilane, vinyltriethoxysilane, Organic silane compounds such as vinyltrimethoxysilane, tetramethoxysilane, tetraethoxysilane, phenyltrimethoxysilane, methyltrimethoxysilane or methyltriethoxysilane, octamethylcyclotetrasiloxane, 1,1,3,3-tetramethyldi Organic siloxane compounds such as siloxane, tetraethoxysilane or hexamethyldisiloxane, or organic silazane compounds such as hexamethylsilazane are used.
- aminosilane and the like are also used.
- silicon-containing hydrocarbons organic silane compounds that do not contain oxygen or nitrogen as a constituent element are preferred, and the proportion of carbon in the constituent elements is higher than that of silicon and can be used as a gas at normal temperature and pressure.
- vinylsilane, dimethylsilane, trimethylsilane, and tetramethylsilane are particularly preferable.
- the heating method of the base material 18 is not particularly limited, but for example, a method of heating by current heating or a method of heating using a heating furnace.
- the timing for starting the heating of the substrate 18 may be before the supply of the silicon-containing hydrocarbon gas or after the supply.
- the base material 18 is linear or ribbon-like, and it is preferable that the base material 18 installed in the vacuum chamber 46 is energized and heated in the heating step. Since heating of the substrate is easy, a heating element can be produced quickly and economically, and a heating element that can be easily applied to the heating element CVD method can be obtained.
- a method of manufacturing a heating element having a laminated structure as shown in FIG. 1 for example, a sintering method or a coating method is also conceivable. When the heating element is linear or ribbon-like, the sintering method or the coating method is used. Manufacturing a heating element having a laminated structure complicates the manufacturing method and makes it difficult to ensure quality and economy.
- the temperature for heating the substrate 18 is preferably 1600 ° C. or higher and lower than 2400 ° C., more preferably 1850 ° C. or higher and lower than 2350 ° C., and further preferably 2000 ° C. or higher and 2200 ° C. or lower.
- the production of the heating element becomes quick and the practicality can be easily confirmed. If the heating temperature is too high, the heat resistance measures of the manufacturing apparatus tend to be excessive. If the heating temperature is too low, it takes a long time to produce the heating element, and it is additionally necessary to confirm whether the heating temperature used in the heating element CVD method is appropriate.
- the heating time depends on the conditions such as the material, shape or size of the base material 18 or the type or supply amount of the silicon-containing hydrocarbon gas, and the second layer 3 occupying the entire heating element 1 (FIG. 1). Is appropriately set so that the ratio is within a desired range.
- the heating time is preferably 500 seconds or more and 3000 seconds or less, more preferably more than 900 seconds and 2400 seconds or less.
- the heating step when the silicon-containing carbonized gas comes into contact with the surface of the base material 18 that has generated heat, tantalum carbonization proceeds from the surface of the base material 18, and silicon from the outer surface of the base material 18 enters the base material 18. Atoms are introduced, and the substrate 18 becomes the heating element 1 (shown in FIG. 1).
- a heat generating body can be used in a high intensity
- the heating element may be manufactured by a sintering method or a coating method.
- a sintering method for example, a paste containing tantalum powder, silicon powder, and carbon powder is sequentially applied to the surface of a base material mainly containing tantalum and fired.
- the coating method is, for example, a method in which a coating solution containing silicon and tantalum carbide is sequentially applied to the surface of a base material mainly containing tantalum and dried, or the surface of the base material contains silicon and tantalum.
- laminating by sputtering or the like There is a method of laminating by sputtering or the like.
- the heating element 1 according to the present embodiment is suitably used as a heating element in the heating element CVD method. Since the heat generating element 1 according to the present embodiment has high durability, the state before use can be maintained even if the film formation is repeated 2000 times, for example.
- Example 1 A heating element was manufactured using the apparatus 100 shown in FIG. At this time, a metal tantalum wire having a diameter of 500 ⁇ m is installed in the vacuum chamber 46 as the base material 18 and vinyl silane is introduced as a silicon-containing hydrocarbon gas at 25 cc (standard state) / min while evacuating the vacuum chamber 46. Then, the inside of the vacuum chamber 46 was adjusted to 1.5 Pa, and the base material 18 disposed in the vacuum chamber 46 was energized and heated at a temperature of 2100 to 2180 ° C. for 1800 seconds to obtain a heating element.
- a metal tantalum wire having a diameter of 500 ⁇ m is installed in the vacuum chamber 46 as the base material 18 and vinyl silane is introduced as a silicon-containing hydrocarbon gas at 25 cc (standard state) / min while evacuating the vacuum chamber 46. Then, the inside of the vacuum chamber 46 was adjusted to 1.5 Pa, and the base material 18 disposed in the vacuum chamber 46 was energized and heated at a temperature of 2100 to 2180
- the carburized thickness (distance from the outer surface of the second layer to the inner surface of the first layer, hereinafter also referred to as the thickness of the second layer) was 130 to 180 ⁇ m (minimum value to maximum value). .
- the carburized thickness was measured by determining the center position on the SIMS C component image and measuring the length from the outer surface of the second layer in the cross section toward the center.
- Example 2 A heating element was manufactured in the same manner as in Example 1 except that the heating time of the substrate 18 was changed to 900 seconds.
- the carburization thickness was 50 to 80 ⁇ m (minimum value to maximum value).
- the carburized thickness was measured by the same method as in Example 1.
- Example 3 A heating element was produced in the same manner as in Example 1 except that the heating temperature of the substrate 18 was changed to 1900 to 2000 ° C.
- the carburized thickness was 40 to 50 ⁇ m (minimum value to maximum value). The carburized thickness was measured by the same method as in Example 1.
- Example 2 A heating element was produced in the same manner as in Example 1 except that vinylsilane was changed to acetylene and the heating time was changed to 5400 seconds.
- the carburized thickness was 130 to 180 ⁇ m (minimum value to maximum value). The carburized thickness was measured by the same method as in Example 1.
- Example 3 A heating element was produced in the same manner as in Example 1 except that vinylsilane was changed to methane and the heating time was changed to 8100 seconds.
- the carburized thickness was 130 to 180 ⁇ m (minimum value to maximum value). The carburized thickness was measured by the same method as in Example 1.
- the vacuum chamber was depressurized to 1.5 Pa and then applied to the heating element at 2000 to 2200 ° C.
- the process of supplying vinylsilane gas as a raw material gas at 25 cc (standard state) / min for 5 seconds while repeating the heat generation was repeated every 30 seconds.
- the inside of the vacuum chamber was exhausted, a leak gas was introduced, the inside of the vacuum chamber was brought to atmospheric pressure, and the heating element was taken out. Thereafter, the state of the heating element was visually observed.
- the heating element is removed from the manufacturing apparatus, and the center part of the end part and the return part on the side attached to the electrode part of the heating element (in each example and comparative example, on the side attached to the electrode part of the heating element)
- the length from the end portion to the return portion was 160 mm, and the central portion was 80 mm portion from the return portion.
- the strength was confirmed by grasping with a finger and shaking with a wrist in the air.
- the evaluation criteria are as follows. The evaluation results are shown in Table 1. ⁇ : Almost no deformation was observed in the heating element after the repeated heating process (changes in the position of each part compared to before the repeated heating process was 2 mm or less), and it was resistant to use in a film forming apparatus.
- Example 1 (Observation after repeated film formation) About the heat generating body of Example 1, Example 2, and the comparative example 1, the external appearance of the heat generating body after repeating film-forming 2000 times was observed. A photograph is shown in FIG.
- Example 1 silicon was present at the interface portion between the first layer and the second layer, and the silicon concentration at the interface portion was higher than the silicon concentration at portions other than the interface portion. Also in Example 2 and Example 3, the element distribution was the same as in Example 1. Moreover, as shown in Table 1, each Example showed the outstanding durability in 2000 times repeated heating. As shown in FIG. 3, in Example 1, the appearance of the heating element was almost the same as that before use after repeated heating 2000 times. In Example 2, the heating element was slightly deformed after repeated heating 2000 times, but it was suppressed to the extent that it could withstand the use of the film forming apparatus.
- the silicon concentration in the inner peripheral part of a 2nd layer is the silicon concentration in parts other than the said inner peripheral part. It was confirmed that it was larger.
- Comparative Example 2 and Comparative Example 3 had the first layer and the second layer, but no silicon was present at the interface.
- Table 1 in each comparative example, no durability was obtained in 2000 repeated film formations.
- Comparative Example 1 after 2000 times of repeated film formation, the heating element was greatly deformed and could not withstand the use of the film formation apparatus.
- the distance between both fulcrums was 30 mm, and the method of applying the load was the I method, and the load speed was 0.1 N / s.
- Example 1 As shown in Table 2, the bending strength of Example 1 was larger than that of Comparative Example 2 and Comparative Example 3.
- Example 4 A heating element was produced in the same manner as in Example 1 except that vinylsilane was changed to monomethylsilane.
- the carburized thickness was 40 to 50 ⁇ m (minimum value to maximum value).
- the carburized thickness was measured by the same method as in Example 1.
- FIG. 5 shows an image in which the distribution of each element is processed to gray gradation, the distribution of each element is more accurately expressed by a color image before processing to gray.
- Example 4 silicon was present at the interface portion between the first layer and the second layer, and the silicon concentration at the interface portion was higher than the silicon concentration at portions other than the interface portion. 5, due to the positional relationship between the high-concentration regions of Si and C components, the silicon concentration in the inner peripheral portion of the second layer is also different from that in the portion other than the inner peripheral portion in Example 4. It was confirmed that it was larger than the concentration.
Abstract
Description
基材18は、発熱体の材料となる物質である。基材18の形状は、発熱体の形状に合わせて適宜選択される。図2では、一例として、基材18が線状である形態を示した。基材18の材質は、例えば、タンタル、タンタル基合金、又は添加剤を含有させたタンタル若しくはタンタル基合金である。タンタル基合金においてタンタルと合金を形成する金属は、例えば、タングステン、ニオブ、イリジウム、クロム、ハフニウム及びモリブデンのうち少なくとも1種であることが好ましい。タンタル基合金は、タンタルを80原子%以上含有することが好ましい。タンタル又はタンタル基合金に含有される添加剤は、例えば、ジルコニア若しくはイットリア、カルシア又はシリカなどの酸化物である。添加剤の添加量は、1質量%以下であることが好ましい。
設置工程後、ベント(不図示)を閉じ、排気ポンプ(不図示)を作動させ、真空バルブ48を開とすることで反応室12内の空気を排気する。次いで、反応室12内を排気しながらガス供給管23から珪素含有炭化水素ガスを導入して、真空チャンバ46内を所定の圧力に調整する。所定の圧力は、100Pa以下であることが好ましく、10Pa以下であることがより好ましく、1.5Pa以下であることが更に好ましい。また、真空チャンバ46内の圧力の下限は、特に限定されない。100Paを超過すると、製造装置の耐熱対策が過剰となる傾向がある。また、加熱工程において発生したダストが発熱体及びチャンバに付着し、トラブルの要因となる傾向にある。これらの傾向は、温度が低いほど顕著となる。チャンバ内の圧力は1Pa以上とすることが好ましい。チャンバ内が1Pa未満となると、発熱体の作製時間が長くなる傾向にある。
図2に示す装置100を用いて発熱体を製造した。このとき、基材18として直径500μmの金属タンタル線を真空チャンバ46内に設置し、真空チャンバ46内を排気しながら、珪素含有炭化水素ガスとしてビニルシランを25cc(標準状態)/分で導入して、真空チャンバ46内を1.5Paに調整し、真空チャンバ46内に配置された基材18を、2100~2180℃の温度で1800秒間通電加熱して発熱体を得た。浸炭厚さ(第2層の外表面から第1層の内表面までの距離、以降、第2層の厚さということもある。)は、130~180μm(最小値~最大値)であった。浸炭厚さは、SIMSのC成分の画像上で中心位置を定め、断面における第2層の外表面から中心方向に向かって長さを測定することによって測定した。
基材18の加熱時間を900秒に変更した以外は、実施例1と同様にして発熱体を製造した。浸炭厚さ(第2層の厚さ)は、50~80μm(最小値~最大値)であった。浸炭厚さは、実施例1と同様の方法で測定した。
基材18の加熱温度を1900~2000℃に変更した以外は、実施例1と同様にして発熱体を製造した。浸炭厚さ(第2層の厚さ)は、40~50μm(最小値~最大値)であった。浸炭厚さは、実施例1と同様の方法で測定した。
直径500μmの金属タンタル線を発熱体とした。
ビニルシランをアセチレンに変更し、加熱時間を5400秒に変更した以外は、実施例1と同様にして発熱体を製造した。浸炭厚さ(第2層の厚さ)は、130~180μm(最小値~最大値)であった。浸炭厚さは、実施例1と同様の方法で測定した。
ビニルシランをメタンに変更し、加熱時間を8100秒に変更した以外は、実施例1と同様にして発熱体を製造した。浸炭厚さ(第2層の厚さ)は、130~180μm(最小値~最大値)であった。浸炭厚さは、実施例1と同様の方法で測定した。
図2に示す発熱体の製造装置100を用いて、各実施例及び比較例の発熱体を取り付けた状態で、真空チャンバ内を1.5Paまで減圧後、発熱体に印加して2000~2200℃に発熱させつつ、原料ガスとしてビニルシランガスを25cc(標準状態)/分で5秒間供給する工程を、30秒毎に繰り返した。この繰り返し加熱工程を2000回行った後、発熱体の通電及び原料ガスの供給を終了し、真空チャンバ内を排気後、リークガスを導入して、真空チャンバ内を大気圧とし、発熱体を取り出した後、発熱体の状態を目視で観察した。また、発熱体を上記製造装置から外して、発熱体の電極部に取り付けられる側の端部と返し部との中央部分(各実施例及び比較例では、発熱体の電極部に取り付けられる側の端部から返し部までの長さは160mmであり、中央部分は、返し部から80mm部分であった。)を指で把持して宙空に手首で振ることによって、強度を確認した。評価基準は次のとおりである。評価結果を表1に示す。
○:繰り返し加熱工程後の発熱体に変形がほとんど見られず(繰り返し加熱工程前と比較した各部位の位置の変化が2mm以下)、成膜装置での使用に耐える。又は、発熱体を指で把持して振っても折損やクラックが生じない(実用レベル)。
△:繰り返し加熱工程後の発熱体に変形がわずかに見られるものの(繰り返し加熱工程前と比較した各部位の位置の変化が2mmを超え4mm以下)、成膜装置で使用できる。又は、発熱体を指で把持して振っても折損やクラックが生じない(実用下限レベル)。
×:繰り返し成膜後の発熱体が大きく変形して繰り返し加熱工程前と比較した各部位の位置の変化が4mmを超える)、成膜装置で使用できない。又は、発熱体を指で把持して振ると、折損やクラックを生じる(実用不適レベル)。
実施例1、実施例2及び比較例1の発熱体について、成膜を2000回繰り返した後の発熱体の外観を観察した。写真を図3に示す。
実施例1、実施例2及び比較例1の発熱体について、断面状態を、光学顕微鏡を用いて倍率400倍で確認した。光学顕微鏡写真を図3に示す。
実施例1、比較例2及び比較例3の断面のH,C,O,Si,Ta濃度を、SIMSを用いて確認した。分析結果を図4に示す。図4では、各元素の分布をグレー階調に処理した画像を示したが、各元素の分布はグレー調に処理する前のカラー画像によって、より正確に表現される。
浸炭厚さが130~180μmである実施例1、比較例2及び比較例3について、曲げ強さを比較した。曲げ強さは、JIS S 6005:2007「シャープペンシル用しん」の「8.3曲げ強さ」に準じて、「しん」を「発熱体」に置き換えて測定した。すなわち、両支点間に支持した発熱体の中央部に、荷重を加え、発熱体が折損した時の荷重を測定し、曲げ強さを次の式(数1)によって算出した。実施例1、比較例2及び比較例3について、それぞれ2本ずつの発熱体を用意し、試験を行った(n=1,2)。両支点間の距離は30mm、荷重の加え方は、I法を適用し、荷重速度を0.1N/sとした。なお、荷重を加える先端及び両支点の先端の形状(半径R)は、R=0.2±0.02mmとした。評価結果を表2に示す。
ビニルシランをモノメチルシランに変更した以外は、実施例1と同様にして発熱体を製造した。浸炭厚さ(第2層の厚さ)は、40~50μm(最小値~最大値)であった。浸炭厚さは、実施例1と同様の方法で測定した。
2 第1層
2a 第1層の外周部
3 第2層
3a 第2層の内周部
4 界面部
11 ガス噴出口
11x 底面側ガス噴出口
11y 側面側ガス噴出口
12 反応室
16 ガス供給口
17 ガス流路
18 基材
19 電線
20 ヒータ電源
21 電極部
22 排気管
23 ガス供給管
24a ガス流量調整器
25a バルブ
26 接続部
35 支持部材
42 天面壁
43 底面壁
44 側面壁
46 真空チャンバ
48 真空バルブ
100 発熱体の製造装置
Claims (6)
- 金属タンタル相を有する第1層と、
前記第1層の周囲を覆い、かつ、炭化タンタル相を有する第2層と、
を有し、
前記第1層と前記第2層との界面部における珪素の濃度は、当該界面部以外の部分における珪素の濃度より高いことを特徴とする発熱体。 - 前記第2層の内周部における珪素の濃度は、当該内周部以外の部分における珪素の濃度より大きいことを特徴とする請求項1に記載の発熱体。
- 前記発熱体の断面積に対する前記第1層の断面積の比率は、0.07以上0.64以下であることを特徴とする請求項1又は2に記載の発熱体。
- タンタルを主成分とする基材を真空チャンバ内に設置する設置工程と、
珪素含有炭化水素ガスを前記真空チャンバ内に導入し、前記真空チャンバ内に設置された前記基材を加熱し、前記基材の外表面から前記基材の内部に珪素原子を導入する加熱工程と、
を有することを特徴とする発熱体の製造方法。 - 前記基材は、線状又はリボン状であり、
前記加熱工程において、前記真空チャンバ内に設置された前記基材を通電加熱することを特徴とする請求項4に記載の発熱体の製造方法。 - 前記加熱工程において、前記基材を、1600℃以上2400℃未満の温度で加熱することを特徴とする請求項4又は5に記載の発熱体の製造方法。
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CN201680008898.4A CN107429394A (zh) | 2015-02-18 | 2016-02-16 | 发热体及其制造方法 |
EP16752606.0A EP3260573B1 (en) | 2015-02-18 | 2016-02-16 | Heat generation element and method for producing the same |
KR1020177025753A KR20170118137A (ko) | 2015-02-18 | 2016-02-16 | 발열체 및 그 제조 방법 |
SG11201706481RA SG11201706481RA (en) | 2015-02-18 | 2016-02-16 | Heat generation element and method for producing same |
JP2017500771A JP6731397B2 (ja) | 2015-02-18 | 2016-02-16 | 発熱体及びその製造方法 |
US15/547,917 US20180027613A1 (en) | 2015-02-18 | 2016-02-16 | Heat generation element and method for producing same |
AU2016220723A AU2016220723A1 (en) | 2015-02-18 | 2016-02-16 | Heat generation element and method for producing same |
TW105104787A TW201704519A (zh) | 2015-02-18 | 2016-02-18 | 發熱體及其製造方法 |
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JP2017088998A (ja) * | 2015-06-25 | 2017-05-25 | コミッサリア ア レネルジー アトミーク エ オ ゼネルジ ザルタナテイヴ | タンタル又はタンタル合金部材を処理するための方法 |
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DK3454626T3 (da) * | 2016-07-05 | 2020-11-09 | Int Engineered Environmental Solutions Inc | Varmegenereringsanordning og fremgangsmåde til fremstilling heraf |
JP6881357B2 (ja) * | 2018-03-08 | 2021-06-02 | 信越半導体株式会社 | 炭化珪素単結晶の製造方法 |
JP2020164932A (ja) * | 2019-03-29 | 2020-10-08 | 株式会社アルバック | 通電加熱線、通電加熱線の製造方法および真空処理装置 |
CN110784947B (zh) * | 2019-10-29 | 2020-10-27 | 北京理工大学 | 一种用于平板撞击实验前对样品升温的加热装置及加热方法 |
CN116268575A (zh) * | 2021-12-21 | 2023-06-23 | 深圳市合元科技有限公司 | 发热组件和气溶胶生成装置 |
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US20180027613A1 (en) | 2018-01-25 |
JPWO2016133220A1 (ja) | 2017-11-30 |
TW201704519A (zh) | 2017-02-01 |
EP3260573A1 (en) | 2017-12-27 |
EP3260573B1 (en) | 2019-10-02 |
KR20170118137A (ko) | 2017-10-24 |
PH12017501437A1 (en) | 2018-01-15 |
CN107429394A (zh) | 2017-12-01 |
SG11201706481RA (en) | 2017-09-28 |
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