TWI568706B - Thermal spraying materials - Google Patents
Thermal spraying materials Download PDFInfo
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- TWI568706B TWI568706B TW103140637A TW103140637A TWI568706B TW I568706 B TWI568706 B TW I568706B TW 103140637 A TW103140637 A TW 103140637A TW 103140637 A TW103140637 A TW 103140637A TW I568706 B TWI568706 B TW I568706B
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- 239000000463 material Substances 0.000 title claims description 44
- 238000007751 thermal spraying Methods 0.000 title description 10
- 229910052751 metal Inorganic materials 0.000 claims description 68
- 239000002184 metal Substances 0.000 claims description 68
- 239000011863 silicon-based powder Substances 0.000 claims description 64
- 239000007921 spray Substances 0.000 claims description 44
- 239000000843 powder Substances 0.000 claims description 41
- 239000002245 particle Substances 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 239000012159 carrier gas Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 description 14
- 238000010410 dusting Methods 0.000 description 12
- 239000011449 brick Substances 0.000 description 9
- 238000010276 construction Methods 0.000 description 6
- 239000000428 dust Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000000007 visual effect Effects 0.000 description 4
- 229910000420 cerium oxide Inorganic materials 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 3
- 239000003832 thermite Substances 0.000 description 3
- 229910018134 Al-Mg Inorganic materials 0.000 description 2
- 229910018467 Al—Mg Inorganic materials 0.000 description 2
- 229910014458 Ca-Si Inorganic materials 0.000 description 2
- 229910001111 Fine metal Inorganic materials 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 229910017082 Fe-Si Inorganic materials 0.000 description 1
- 229910017133 Fe—Si Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- UUANUBMIVSXABE-UHFFFAOYSA-N calcium cerium(3+) oxygen(2-) Chemical compound [O-2].[Ce+3].[O-2].[Ca+2] UUANUBMIVSXABE-UHFFFAOYSA-N 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- UAMZXLIURMNTHD-UHFFFAOYSA-N dialuminum;magnesium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Mg+2].[Al+3].[Al+3] UAMZXLIURMNTHD-UHFFFAOYSA-N 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- -1 magnesium oxide-cerium dioxide Chemical compound 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
- C23C4/06—Metallic material
- C23C4/067—Metallic material containing free particles of non-metal elements, e.g. carbon, silicon, boron, phosphorus or arsenic
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/14—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silica
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/02—Silicon
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62222—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining ceramic coatings
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/428—Silicon
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5463—Particle size distributions
- C04B2235/5472—Bimodal, multi-modal or multi-fraction
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- Silicon Compounds (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Powder Metallurgy (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Ceramic Products (AREA)
Description
本發明係關於使用在工業用窯爐之爐壁的修補等之熱噴塗材料。
修補工業用窯爐的爐壁之技術之一，為人所知者有將以耐火原材料粉及金屬粉為主材料之熱噴塗材料，以氧氣或含有氧氣之氣體作為運送氣體吹送至被施工面(被修補面)，並應用金屬粉的燃燒放熱使耐火材料熔融附著之鋁熱劑熱噴塗(Thermite Welding)法。
如此，由於鋁熱劑熱噴塗所使用之熱噴塗材料包含金屬粉，故必然有容易產生發火之問題，專利文獻1中，係提出一種由熱噴塗裝置的構成面所進行之防發火技術。惟只要熱噴塗材料具有發火性，則僅由熱噴塗裝置的構成面所進行之防發火技術仍嫌不足，因而期望一種可抑制熱噴塗材料本身的發火性之技術。
抑制熱噴塗材料的發火性時，為人所知者有使用發火性較Al-Mg合金粉或Ca-Si合金粉等的其他金屬粉更低之金屬Si粉作為主材料之作法(例如參考專利文獻
2、3)。
此外，對於熱噴塗材料，除了上述防發火之外，為了提升作業性，亦要求可抑制由金屬粉所造成之發塵，或是為了對被修補面進行穩定的施工，而要求可提升接著性(熔融附著性)。關於抑制由金屬粉所造成之發塵，本發明者們對於在金屬Si粉全體中包含10質量%以上之2μm以下的金屬Si粉之上述專利文獻3的熱噴塗材料進行試驗，得知在熱噴塗施工時，由金屬Si粉所造成之發塵顯著地產生，使作業人員的視線變差，非常難以進行熱噴塗施工。
[專利文獻1]日本特開2013-43141號公報
[專利文獻2]日本特許第4109663號公報
[專利文獻3]日本特開2005-336001號公報
本發明所欲解決之課題，在於抑制鋁熱劑熱噴塗所使用之熱噴塗材料的發火性及發塵性，並提升接著性。
本發明者們係為了解決上述課題而進行精心探討，結果發現到首先從防止發火之觀點來看，降低金屬Si粉的中位徑者乃為有效。此外，從抑制金屬Si粉所造成之發塵性之觀點來看，發現到降低粒度2μm以下的金屬Si粉之含量者乃為有效。再者，從接著性提升之觀點來看，發現到由於金屬Si粉的含量少時，無法得到作為熱噴塗材料所需之接著性，故須具備接著性提升所需之金屬Si粉的含量。
本發明係根據此等發現而完成，本發明之熱噴塗材料，其係包含耐火材料粉及金屬Si粉，並以氧氣或含有氧氣之氣體作為運送氣體吹送至被施工面，藉由金屬Si粉的燃燒放熱而熔融附著於被施工面之熱噴塗材料，熱噴塗材料全體中之金屬Si粉的含量為10質量%以上25質量%以下，前述金屬Si粉的中位徑為10μm以下，前述金屬Si粉全體中之粒度2μm以下的金屬Si粉之含量為8質量%以下。
本發明中，前述金屬Si粉的中位徑較佳為8μm以下。
根據本發明，可抑制鋁熱劑熱噴塗所使用之熱噴塗材料的發火性及發塵性，並提升接著性。亦即，藉由將熱噴塗材料中之金屬Si粉的中位徑設為15μm以下，可抑制發火性，並藉由將金屬Si粉全體中之粒度2μm以
下的金屬Si粉之含量設為8質量%以下，可抑制發塵性。再者，藉由將金屬Si粉的含量設為10質量%以上，可得到接著性。當金屬Si粉的含量超過25質量%時，即使降低中位徑，亦容易發火。因此，從接著性及發火性之觀點來看，金屬Si粉的含量必須為10質量%以上25質量%以下。
第1圖係顯示本發明者們所進行之實驗之金屬Si粉的中位徑與爆發臨限濃度之關係。
首先，本發明之特徵為：從抑制熱噴塗材料的發火性之觀點來看，將熱噴塗材料中所包含之金屬Si粉的中位徑設為15μm以下，且更具限定涵義者設為10μm以下。
第1圖係顯示本發明者們所進行之實驗之金屬Si粉的中位徑與爆發臨限濃度之關係。爆發臨限濃度，係根據JIS Z8818並在氧氛圍下測定。中位徑，係以超音波均質機使試樣(金屬Si粉)分散，並以雷射繞射散射式粒度分布計來測定。位於由該測定所得之粒度之累積分布(體積分布)的中央累積值(d50)者，為中位徑。
如第1圖所示，金屬Si粉的中位徑為15μm
以下時，可得知爆發臨限濃度急遽升高，而不易發火。根據先前的技術常識，降低金屬Si粉的中位徑時，可預測的是理應容易發火，但在本發明者們的實驗中，乃得到與該預測相反之發現。此可推測為當金屬Si粉的中位徑為15μm以下時，細微的金屬Si粉凝聚而形成虛擬粒子，使表觀粒徑增大而使金屬Si粉的活性降低之故。
於實際的熱噴塗施工中，可考量為在金屬Si粉以運送氣體運送之中途，由於中位徑15μm以下的金屬Si粉凝聚而形成虛擬粒子並使活性降低，使得發火性被抑制。另一方面，熱噴塗施工中，金屬Si粉的活性降低，對於往被施工面之接著性(熔融附著性)會帶來不良影響。然而，本發明中，金屬Si粉原本為中位徑15μm以下的細微粒子，即使在依據運送氣體之運送中形成粗大的虛擬粒子，亦會因往被施工面之吹送(碰撞)所造成之衝擊而分離為個別的細微金屬Si粉，而充分發揮該活性。如此，本發明，藉由將金屬Si粉的中位徑設為15μm以下，可抑制熱噴塗材料的發火性，且亦可提升往被施工面之接著性(熔融附著性)，而達到一石二鳥之效果。
此外，本發明之特徵為：從抑制熱噴塗材料的發塵性之觀點來看，將金屬Si粉全體中之粒度2μm以下的金屬Si粉之含量設為8質量%以下。此係依據以下之本發明者們的嶄新發現，亦即，降低粒度2μm以下的金屬Si粉之含量者，對於抑制熱噴塗材料的發塵性乃為有效。亦即，即使降低金屬Si粉的中位徑，藉由將粒度
2μm以下的含量設為8質量%以下，亦可抑制發塵性。
本發明中，熱噴塗材料全體中之金屬Si粉的含量係設為10質量%以上25質量%以下。金屬Si粉的含量未達10質量%時，無法得到作為熱噴塗材料之必要的接著性(熔融附著性)，超過25質量%時，即使降低中位徑，亦容易產生發火。
本發明之熱噴塗材料中，金屬Si粉以外的剩餘部分，主要是由非金屬的耐火材料粉所構成。非金屬的耐火材料粉之材質，可設為與以往熱噴塗材料所使用之耐火材料粉為相同材質者，例如可列舉出選自二氧化矽質粉、氧化鎂質粉、氧化鋁質粉、氧化鋁-二氧化矽質粉、氧化鎂-二氧化矽質粉、氧化鋁-氧化鎂質粉、氧化鋁-尖晶石質粉、氧化鈣質粉、氧化鈣-二氧化矽質粉等之一種或兩種以上的組合。此等耐火材料粉的粒度構成，亦可依照以往的熱噴塗材料來適當地調整。
本發明中，係使用金屬Si粉作為金屬粉的主材料，金屬Si粉以外的剩餘部分，除了非金屬的耐火材料粉之外，亦可少量(於熱噴塗材料全體中最大為1質量%)添加Al粉、Al-Mg合金粉、Mg粉、Fe-Si合金粉、Ca-Si合金粉等之金屬Si粉以外的金屬粉，作為用以提升放熱性之助燃劑。再者，可在不對熱噴塗材料的物性造成影響之範圍(例如於熱噴塗材料全體中未達2質量%)，添加樹脂、瀝青等之可在氧氛圍下燃燒之有機系粉末作為助著火劑。
第1表係顯示本發明之熱噴塗材料的實施例以及比較例。本實施例中，係使用二氧化矽質粉作為非金屬的耐火材料粉。二氧化矽質粉，可列舉出天然石英粉、熔融二氧化矽粉、矽砂、矽石粉、或是以此等成分為主體之耐火物粉等。
將各例的熱噴塗材料熱噴塗施工於作為被施工面之磚頭的表面，並評估該熱噴塗施工時之發火的有無、發塵性以及熱噴塗後之與磚頭之接著性(熔融附著性)。
熱噴塗施工係使用一般的熱噴塗裝置，並使用槽的底部所具備之帶式供料機切取熱噴塗材料，以氧氣來運送，然後從噴嘴前端朝磚頭表面吹送。熱噴塗材料(粉體)的供給速度設為60kg/h，磚頭表面與噴嘴前端之距離設為80mm，每1次將3kg的熱噴塗材料吹送至磚頭表面。
熱噴塗施工時之發火的有無之評估，係重複進行上述熱噴塗施工100次，以發火的產生為0次者為◎，1次者為○，2次者為△，3次以上者為×。
發塵性的評估，係以在熱噴塗施工時幾乎無發塵且視野良好者為◎，發塵少但視野良好者為○，有發塵且視野稍差但施工仍無問題者為△，發塵且視野差而無法施工者為×。
與磚頭之接著性的評估，係以藉由敲擊將施工體卸下時與磚頭一同毀壞者為◎，外觀未觀察到接著不良，且藉由敲擊欲將施工體卸下時從接著界面剝離者為○，外觀可觀察到部分脫離之處者為△，外觀具有顯著的接著不良者為×。
上述任一評估中，係依照◎、○、△、×的順序表示其評估結果的惡化。總合評估係配合上述任一評估中之評估結果最差者。例如，於任一評估中，若○為最差
的結果，則總合評估為○，若△為最差的結果，則總合評估為△，若×為最差的結果，則總合評估為×。總合評估中，以△以上的評估為合格，以×的評估為不合格。
第1表的各實施例，均位於本發明的範圍內，得到總合評估為△以上的評估。
相對於此，比較例1，由於金屬Si粉的含量過少，所以與磚頭之接著性差。比較例2，由於金屬Si粉的含量過多，所以容易發火。比較例3、4，由於金屬Si粉的中位徑過大，所以容易發火。
在此，金屬Si粉的中位徑為15μm之參考例4、5的總合評估為△，相對於此，金屬Si粉的中位徑為10μm之實施例6~8的總合評估為○，8μm以下之實施例1~3、9的總合評估為◎，故可說是金屬Si粉的中位徑較佳為10μm以下，尤佳為8μm以下。
此外，參考例5為金屬Si粉全體中之粒度2μm以下的含量為8質量%之例，發塵性的評估為△。實施例7，其金屬Si粉全體中之粒度2μm以下的含量為與參考例5相同之8質量%，但發塵性的評估為○。此係由於實施例7與參考例5相比，其金屬Si粉的含量高，所以熱噴塗材料的接著性(熔融附著性)高之故。另一方面，金屬Si粉全體中之粒度2μm以下的含量為10質量%之比較例2之發塵性的評估為×。考量到以上結果，抑制熱噴塗材料的發塵性時，可說是必須將金屬Si粉全體中之粒度2μm以下的含量設為8質量%以下。
Claims (2)
- 一種熱噴塗材料，其係包含耐火材料粉及金屬Si粉，並以氧氣或含有氧氣之氣體作為運送氣體吹送至被施工面，藉由前述金屬Si粉的燃燒放熱而熔融附著於被施工面之熱噴塗材料，熱噴塗材料全體中之金屬Si粉的含量為10質量%以上25質量%以下，前述金屬Si粉的中位徑為10μm以下，前述金屬Si粉全體中之粒度2μm以下的金屬Si粉之含量為8質量%以下。
- 如請求項1之熱噴塗材料，其中前述金屬Si粉的中位徑為8μm以下。
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