JPS6221868B2 - - Google Patents
Info
- Publication number
- JPS6221868B2 JPS6221868B2 JP7952984A JP7952984A JPS6221868B2 JP S6221868 B2 JPS6221868 B2 JP S6221868B2 JP 7952984 A JP7952984 A JP 7952984A JP 7952984 A JP7952984 A JP 7952984A JP S6221868 B2 JPS6221868 B2 JP S6221868B2
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- silicon carbide
- reaction
- silicon
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 51
- 239000000758 substrate Substances 0.000 claims description 48
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 47
- 238000000576 coating method Methods 0.000 claims description 25
- 239000011248 coating agent Substances 0.000 claims description 22
- 150000003961 organosilicon compounds Chemical class 0.000 claims description 19
- 239000012808 vapor phase Substances 0.000 claims description 9
- 238000000197 pyrolysis Methods 0.000 claims description 8
- 238000000151 deposition Methods 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000010409 thin film Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 description 25
- 238000006243 chemical reaction Methods 0.000 description 21
- 239000007789 gas Substances 0.000 description 21
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 17
- 239000010408 film Substances 0.000 description 15
- 229910052753 mercury Inorganic materials 0.000 description 14
- 238000005979 thermal decomposition reaction Methods 0.000 description 12
- 229910052990 silicon hydride Inorganic materials 0.000 description 10
- -1 silicon hydride compound Chemical class 0.000 description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 8
- 238000005229 chemical vapour deposition Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 6
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 5
- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 239000012776 electronic material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 150000004756 silanes Chemical class 0.000 description 4
- 150000003377 silicon compounds Chemical class 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000007348 radical reaction Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910021419 crystalline silicon Inorganic materials 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229920000548 poly(silane) polymer Polymers 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VIPCDVWYAADTGR-UHFFFAOYSA-N trimethyl(methylsilyl)silane Chemical compound C[SiH2][Si](C)(C)C VIPCDVWYAADTGR-UHFFFAOYSA-N 0.000 description 2
- PQDJYEQOELDLCP-UHFFFAOYSA-N trimethylsilane Chemical compound C[SiH](C)C PQDJYEQOELDLCP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 description 1
- UIUXUFNYAYAMOE-UHFFFAOYSA-N methylsilane Chemical compound [SiH3]C UIUXUFNYAYAMOE-UHFFFAOYSA-N 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 125000000843 phenylene group Chemical group C1(=C(C=CC=C1)*)* 0.000 description 1
- 238000001782 photodegradation Methods 0.000 description 1
- 238000006303 photolysis reaction Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- 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
- C23C16/02—Pretreatment of the material to be coated
- C23C16/0272—Deposition of sub-layers, e.g. to promote the adhesion of the main coating
-
- 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
- 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
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/32—Carbides
- C23C16/325—Silicon carbide
Description
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The present invention relates to a method for producing a silicon carbide coating, particularly a silicon carbide coating useful as various electronic material parts. High-purity silicon carbide exhibits excellent physical properties such as heat resistance, oxidation resistance, chemical resistance, and thermal conductivity, so it is used as a coating material for various electronic materials and their jigs. is being attempted.
On the other hand, various methods have been proposed in the past for applying crystalline silicon carbide coatings to the surfaces of various substrates. (2) A method of thermally decomposing a mixture of silane or halogenated silane and hydrocarbon gas (Japanese Patent Publication No. 57-116200, Japanese Patent Publication No. 116200/1989)
57-118082), (3) A method of heating SiO 2 or a mixed powder of Si and carbon at a high temperature of 1500°C or higher (JP-A-52-42365, JP-A-56-26781, JP-A-Sho 57-3780) is known. However, methods (1) and (3) require high temperatures of 1500°C or higher, which has the disadvantage of limiting the base material that can be used. Method (2) also uses monosilane (SiH) as the starting material. 4 ), disilane (Si 2 H 6 )
When using silicon carbide, the thermal decomposition temperature difference (speed difference) between the silicon hydride compound and the hydrocarbon compound is large, so advanced concentration adjustment is required to obtain a homogeneous silicon carbide film. However, when halogenated silanes are used as starting materials, there are disadvantages in that they are easily hydrolyzed and the reaction temperature is high, and furthermore, it is difficult to treat by-products such as hydrochloric acid and chlorine. The present invention relates to a method for producing a silicon carbide coating that solves these disadvantages, and is a method of manufacturing a silicon carbide coating by converting an organosilicon compound having at least one silicon-hydrogen bond in the molecule into a silicon hydride compound. Silicon carbide is deposited as a thin film on a substrate by photo-CVD or mercury-sensitized photo-CVD in coexistence, and then the organosilicon compound is deposited on the substrate for 700 g.
It is characterized by depositing silicon carbide obtained by vapor phase thermal decomposition at ~1500°C in the form of a thin film. That is, the present inventors have conducted research on methods for applying high-purity silicon carbide coatings on various substrates, and have first developed an organic silicon compound having at least one silicon-hydrogen bond in its molecule. 1400â
They discovered a method of coating silicon carbide on a substrate by vapor-phase thermal decomposition (see Japanese Patent Application No. 57-195702). They discovered that when they are supplied onto a substrate together with an elementary compound and irradiated with ultraviolet light, these easily decompose and form an amorphous silicon carbide coating on the substrate (patent application
59-55887), but after further consideration, these two
By combining the two methods, first amorphous silicon carbide is coated on the substrate by photo-CVD method using ultraviolet irradiation or mercury-sensitized photo-CVD method, and then silicon carbide is coated on the substrate by vapor phase thermal decomposition of an organosilicon compound. Since the coating obtained by the photo-CVD method is obtained by a radical reaction and has a uniform film quality, the film deposited by the subsequent thermal decomposition reaction is also more homogeneous and less cracked than in the conventional method. The present invention was completed after confirming that the smoothness of the film was excellent. As mentioned above, the organosilicon compound used as a starting material in the method of the present invention is one containing at least one Si-H bond in its molecule, but preferably SiX (X is a halogen atom or an oxygen atom). ) does not contain a bond, and includes, for example, the general formula R 2o+2 (Si) o [wherein R is a hydrogen atom, at least one of which is a hydrogen atom, or a methyl group, an ethyl group, a propyl group, a monovalent hydrocarbon group selected from phenyl group, vinyl group, etc., n is a positive number of 1 to 4], and silanes or polysilanes represented by the general formula [Here, R is the same as above, R 1 is a methylene group, ethylene group, or phenylene group, m is a positive number of 1 to 2]
Examples include silalkylene compounds or silphenylene compounds represented by the above, or compounds having both main skeletons in the same molecule. And, as this organosilicon compound, the following formula CH 3 SiH 3 ,
( CH3 ) 2SiH2 , ( CH3 ) 3SiH , ( C2H5 ) 2SiH2 ,
C 3 H 6 SiH 3 , CH 2 = CHã»CH 3 SiH 2 , C 6 H 5 SiH 3 ,
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åŒ Examples include silanes and polysilanes represented by the formula, and these can be used alone or as a mixture of two or more of them.
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å€æ°ã®ã¯ã©ãã¯ãçºçããã[Formula] (where x is a positive number) Methylhydrodienesilanes obtained by thermally decomposing dimethylpolysilane at a temperature of 350°C or higher are preferred.These organosilicon compounds are , can be produced by conventionally known methods, but since these can be easily purified to a high degree by a distillation process, the silicon carbide obtained by this reaction is also extremely pure. The method of the present invention is carried out by (1) decomposing the above-mentioned organosilicon compound in the coexistence of a silicon hydride compound by a photoCVD method or a mercury-sensitized photoCVD method to form silicon carbide on a substrate; a first step of depositing; (2) this first step;
A second step is performed in which silicon carbide produced by vapor phase thermal decomposition of the organosilicon compound described above is coated on the substrate coated with silicon carbide obtained in the step. In this first step, the above-described organosilicon compound is mixed with a hydrogenated silicon compound such as monosilane (SiH 4 ) or disilane (Si 2 H 6 ) using hydrogen gas or an inert gas such as helium, neon, or nitrogen gas as a carrier gas. This is carried out using a photo-CVD method in which the substrate is introduced into a reactor and irradiated with ultraviolet light. The addition of this silicon hydride compound prevents the photodecomposition of the above-mentioned organosilicon compound, which has a slow photodegradation rate, from colliding with a silicon hydride compound such as SiH 4 or Si 2 H 6 excited by light. However, when SiH 4 is used as the silicon hydride compound and the reaction is to be carried out using ultraviolet light with a wavelength close to visible light, mercury in the amount of vapor pressure is added to the reaction system. It is preferable to use a mercury-sensitized CVD method in which mercury excited by light irradiation collides with gas molecules to impart energy to the gas molecules. A high-pressure mercury lamp or a low-pressure mercury lamp that can irradiate high-energy light can be used as a light source to carry out this reaction, but this reaction is not an ionization reaction like the plasma method, but a radical reaction caused by a light decomposition reaction. Therefore, the amount of silicon hydride compound added is 1 in the molar concentration ratio of silicon hydride compound/organosilicon compound + silicon hydride compound.
It is good to set it to ~50 mol%, preferably 2 to 15 mol%; if it is less than 1 mol%, the amount of generated radicals will be too small and the deposition rate of silicon carbide will be slow;
If it is more than mol %, there will be a disadvantage that SiH 4 , Si 2 H 6 and the like are expensive, making it uneconomical. If the reaction temperature in this first step is 100°C or higher, the reaction rate will be slow, and if hydrogen gas is used as a carrier gas, the number of terminal bonds (SiC:H) in the silicon carbide produced will increase, causing gas to be generated in the next step. It becomes impossible to obtain a homogeneous film,
If the temperature is higher than 700â, the thermal decomposition reaction of the organosilicon compound will proceed at the same time, and a special device will be required to cool the light source, so
The temperature is preferably in the range of 700°C, preferably in the range of 200 to 400°C. In addition, in this step, it is optional to add doping agents such as B 2 H 6 and PH 3 to the above-mentioned organosilicon compound for the purpose of adjusting the electrical properties of the silicon carbide coating film obtained. Ru. Note that the silicon carbide coating film obtained in this process is produced solely by the radical reaction as described above, resulting in a homogeneous film with no defects. A long-term reaction is required to obtain the product, which is not economical. In addition, this silicon carbide film has a weak adhesive strength to the substrate, so it can be used as is for applications that do not require high temperatures, but there are limits to applications that require heat resistance, so the following It is necessary to deposit silicon carbide produced by the second step described in . In addition, when using the second step in the method of the present invention, the film thickness obtained in the first step is
0.05 to 0.6 ÎŒm is sufficient. Next, in this second step, the above-mentioned organosilicon compound is subjected to vapor phase thermal decomposition in a high-temperature reactor, and the generated silicon carbide is deposited on the silicon carbide coating film obtained in the first step. However, this reaction temperature is
At temperatures below 700â, the thermal decomposition reaction is slow, the organic silicon compound used remains without being completely thermally decomposed, and the resulting film lacks surface smoothness.
At temperatures above 1500°C, the growth rate of silicon carbide crystals increases, but the difference in thermal expansion coefficient between the substrate and silicon carbide increases and the adhesive strength decreases;
The temperature is preferably in the range of 1500°C, preferably in the range of 900 to 1300°C. This film thickness varies depending on the thermal expansion coefficient of the substrate used, but it can be 1 Όm or less for a substrate with a large expansion coefficient such as a metal plate, and 5 Όm or more for a substrate with a small expansion coefficient such as a ceramic. The thickness of this film may be changed depending on the purpose of use; it may be several micrometers for corrosion-resistant coatings, but it may be used for applications such as sliding parts, semiconductor jigs, heating containers, etc. due to its strength and heat resistance. A thickness of several tens of micrometers is required for materials that require high durability and abrasion resistance. Next, the substrate used in carrying out the present invention is not particularly limited, but in order to obtain a silicon carbide coating for electronic materials or high-temperature reaction components, it is necessary to use carbon, metal silicon, etc. , sapphire, ceramic materials such as silicon nitride, quartz glass, various metal plates, etc., and the surfaces thereof may be coated with silicon carbide to an appropriate thickness by the method described above. Note that when implementing the method of the present invention, this second
Since the process does not require light irradiation and does not necessarily require a silicon hydride compound, the first and second steps may be performed in separate reactors, but from the viewpoint of productivity, it is possible to perform the same reaction. Preferably, this is carried out within the device. Furthermore, for those used in fields where heat resistance is not required, the first and second steps can be reversed. Next, to explain this based on the attached drawings, the quartz reactor 1 in FIG.
It consists of a reaction zone A and a gas phase pyrolysis zone B, in which a substrate 4 is housed on a substrate support plate 3 placed on a substrate heater 2. Reaction gases are supplied to the reactor 1 from an organosilicon compound inlet 5 and a hydrogenated silicon compound inlet 6 at a predetermined molar ratio, but these gases are not exposed to light.
When the CVD method is used, the mercury is supplied through a tube 7, and when the mercury-sensitized CVD method is used, the mercury is supplied through a tube 10 in which vapor of mercury 9 flows in a constant temperature bath 8 maintained at 20 to 70°C. The reaction gas introduced into the photoCVD reaction zone A is decomposed by ultraviolet light irradiated from the low-pressure mercury lamp 11 to produce silicon carbide, and this silicon carbide is heated to 200°C or higher by the substrate heater 2. The substrate 4, which is deposited on a heated substrate 4 and thus treated, is then transferred to a vapor phase pyrolysis zone B together with a substrate heater. At this point, the only reaction gas is the organosilicon compound from the organosilicon compound inlet 5, which is decomposed and carbonized in the gas phase pyrolysis zone B heated to 900 to 1300°C by the heating heater 12. Silicon is produced and deposited on the silicon carbide coating film on the substrate, and the exhaust gas after the reaction is exhausted from the exhaust port 13. The crystalline silicon carbide coating obtained by the method of the present invention has heat resistance, oxidation resistance, chemical resistance, and airtightness, and is therefore widely used in various applications, particularly for semiconductor substrates, It is said to be useful as a jig for electronic materials, various sealing materials, and thermally conductive members. Examples of the method of the present invention will be given below, but these are not intended to limit the scope of the present invention. Example 1 A graphitic carbon substrate measuring 40 x 40 x 5 mm was placed on a plate on a substrate heater containing a built-in resistance heater housed in a reactor as shown in Figure 1, which was made of a quartz tube with an inner diameter of 120 mm. , which was heated to 500°C. Next, 100 c.c. of trimethylsilane [(CH 3 ) 3 SiH] diluted to 10% by volume with hydrogen gas was placed in this reactor.
200c.c./min of disilane (Si 2 H 6 ) diluted to 10% by volume with hydrogen gas was introduced, and a low-pressure mercury lamp (1849
After 60 minutes of irradiation with ultraviolet light from a
After carrying out the thermal decomposition reaction at 1200â for 30 minutes,
When the reaction zone was cooled and the substrate was taken out, it was found that the substrate was coated with a uniform microcrystalline β-type SiC coating with a thickness of 5 Όm. This product was then repeatedly heated to 1200°C in air, but no change was observed in the coating, and no pinholes or cracks were generated. However, for comparison, the photo-CVD method described above was not performed. A product coated with β-type SiC to a thickness of 5 Όm using only the vapor phase pyrolysis method under the same conditions had an uneven surface and poor smoothness. Example 2 In the method of Example 1, the heating temperature of the substrate was set to 300°C.
â, and tetramethyldisilane [(CH 3 ) 4 Si 2 H 2 ] 100 diluted to 10% by volume with hydrogen gas was added to this reactor.
A mixed gas of cc/min and 200cc/min of monosilane (SiH 4 ) diluted to 10% by volume with hydrogen gas was supplied via a mercury storage tank maintained at 50°C, and a mercury lamp (2537Ã
) was supplied to this gas. After 20 minutes of UV light irradiation from
Stop the gas supply and shut off the mercury vapor,
When the thermal decomposition reaction of tetramethyldisilane was carried out in the same manner as in Example 1, and the substrate was taken out after cooling, it was found that a 6 Όm thick, uniform, smooth and strong microcrystalline coating of β-type SiC was formed on the substrate. It was recognized that Example 3 A reaction sintered silicon carbide (containing 5% silicon) substrate of 40 x 40 x 5 mm was placed in the same reactor as in Example 1, heated to 300°C, and hydrogen was added to the reactor. The same treatment as in Example 2 was carried out except that 150 c.c./min of bisdimethylsilylmethane [(CH 3 ) 2 HSi-CH 2 -SiH (CH 3 ) 2 ] diluted with gas to 5% by volume was introduced. , this substrate was coated with fine crystalline homogeneous β-type SiC with a thickness of about 6 Όm. This SiC coating does not peel off even after repeated heating at 1000°C, and is strongly adhered to the substrate. Even when immersed in a nitric acid solution, unevenness due to acid leaching was observed on the substrate side. However, no abnormality was observed in the SiC coating. For comparison, the substrate after photo-CVD was taken out and coated with silicon carbide by vapor phase pyrolysis at a temperature of 1550°C in a mullite heating tube. Unevenness is observed on the surface where SiC crystals have grown large,
Cracks had occurred throughout the coating. Example 4 A 50Ï x 5 mm disc-shaped single crystal silicon substrate was placed in the same reactor as in Example 1 and heated to 500°C, and diluted to 10% by volume with helium gas in each reactor. A mixed gas of 150 c.c./min of equivalent mixed gas of trimethylsilane and monomethylsilane [CH 3 SiH 3 ] and 3 c.c./min of disilane diluted to 10% by volume with hydrogen gas was introduced together with mercury vapor. After irradiating the substrate with ultraviolet light from a mercury lamp (1849Ã
) for 20 minutes, the substrate was moved to a gas phase pyrolysis zone, the supply of disilane gas was stopped, and the mercury vapor was shut off, and the above mixed silane gas was heated at 1100°C. The thermal decomposition reaction was carried out for 2 hours, and when the substrate was taken out after cooling, it was found that it was coated with silicon carbide to a thickness of 25 Όm. Next, when this material was immersed in a nitric acid bath to remove the single crystal silicon substrate, a uniform silicon carbide plate was obtained.However, for comparison, the mercury-sensitized photoCVD method described above was performed for 3 hours. Approximately 3Ό obtained over time
A large number of cracks were generated in a silicon carbide plate obtained by treating a substrate with a silicon carbide coating of 1.0 m in a nitric acid bath in the same manner as described above.
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FIG. 1 illustrates a longitudinal cross-sectional view of a reaction apparatus for carrying out the method of the present invention. 1... Reactor, 2... Substrate heater, 3... Plate, 4... Substrate, 5, 6... Gas inlet, 8
...Thermostatic bath, 9...Mercury, 11...Mercury lamp,
12... Heater, 13... Exhaust port, A...
PhotoCVD reaction zone, B...gas phase pyrolysis zone.
Claims (1)
ãæããææ©ããçŽ ååç©ãæ°ŽçŽ ããçŽ ååç©ã®
å ±åäžã«å CVDæ³ãããã¯æ°Žéå¢æå CVDæ³ã«
ãã€ãŠçåããçŽ ãšããŠãããåºäœäžã«èèç¶ã«
å ç©ãããåŸããã®äžã«åèšææ©ããçŽ ååç©ã
700ã1500âã§æ°çžç±å解ãããŠåŸãçåããçŽ
ãèèç¶ã«å ç©ãããŠãªãããšãç¹åŸŽãšããçå
ããçŽ è¢«èŠç©ã®è£œé æ¹æ³ã1 An organosilicon compound having at least one silicon-hydrogen bond in the molecule is formed into a thin film on a substrate by photo-CVD or mercury-sensitized photo-CVD in the presence of a hydrogen-silicon compound. After depositing the organosilicon compound on top of the
A method for producing a silicon carbide coating, comprising depositing silicon carbide obtained by vapor phase pyrolysis at 700 to 1500°C in the form of a thin film.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7952984A JPS60224783A (en) | 1984-04-20 | 1984-04-20 | Production of silicon carbide coating |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7952984A JPS60224783A (en) | 1984-04-20 | 1984-04-20 | Production of silicon carbide coating |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS60224783A JPS60224783A (en) | 1985-11-09 |
JPS6221868B2 true JPS6221868B2 (en) | 1987-05-14 |
Family
ID=13692512
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7952984A Granted JPS60224783A (en) | 1984-04-20 | 1984-04-20 | Production of silicon carbide coating |
Country Status (1)
Country | Link |
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JP (1) | JPS60224783A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0211579B1 (en) * | 1985-08-02 | 1990-03-28 | Ngk Insulators, Ltd. | Method of making a silicon nitride sintered member |
JPS6272583A (en) * | 1985-09-26 | 1987-04-03 | æ¥æ¬ç¢åæ ªåŒäŒç€Ÿ | Zirconia-coated silicon carbide sintered member |
JPS62197370A (en) * | 1986-02-20 | 1987-09-01 | æ¥æ¬ç¢åæ ªåŒäŒç€Ÿ | Silicon nitride sintered body |
JP7261542B2 (en) * | 2018-03-13 | 2023-04-20 | ã€ããã³æ ªåŒäŒç€Ÿ | Method for producing SiC-coated silicon material |
-
1984
- 1984-04-20 JP JP7952984A patent/JPS60224783A/en active Granted
Also Published As
Publication number | Publication date |
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JPS60224783A (en) | 1985-11-09 |
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