JP2019509191A - 低収縮かつ高強度である大型サイズのセラミックスプレート及びその製造方法 - Google Patents
低収縮かつ高強度である大型サイズのセラミックスプレート及びその製造方法 Download PDFInfo
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- JP2019509191A JP2019509191A JP2018538744A JP2018538744A JP2019509191A JP 2019509191 A JP2019509191 A JP 2019509191A JP 2018538744 A JP2018538744 A JP 2018538744A JP 2018538744 A JP2018538744 A JP 2018538744A JP 2019509191 A JP2019509191 A JP 2019509191A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 32
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- 238000000034 method Methods 0.000 claims abstract description 30
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 8
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Abstract
Description
(1)セラミックス原料粉体を製造する工程と、
(2)針状ケイ灰石を、シランカップリング剤を用いて表面被覆処理を行い、フュームドシリカ(fumed silica)を用いて予備分散を行うことによって、予備処理された針状ケイ灰石を得る工程と、
(3)セラミックス原料粉体と予備処理された針状ケイ灰石とを十分に混合して造粒し、乾式プレス成形、焼成を行うことによって、低収縮かつ高強度である大型サイズのセラミックスプレートを製造し、そのうち、前記予備処理された針状ケイ灰石の添加量は前記セラミックス原料粉体の10wt%〜30wt%である工程と、を含む、低収縮かつ高強度である大型サイズのセラミックスプレートの製造方法を提供している。
セラミックス原料について
本発明において、セラミックス原料は特に限定されず、例えば、通常のセラミックス原料を用いてもよい。使用される原料及びその化学成分の一例は、表1に示されたようなものである。
水洗泥を8〜20%、混合泥を 4〜16%、カリウム砂を12〜20%、中温砂を(medium-temperature-treated sand)24〜30%、 1#ナトリウム砂を6〜12%、2#ナトリウム砂を16〜22%、黒滑石を1〜2%にすることが好ましい。
本発明では、針状ケイ灰石の長さと直径の比を10〜18とすることが好ましい。長さと直径の比を18より大きくすれば、分散が難しくなる。また長さと直径の比を10より小さくすれば、補強効果に影響を与える。また針状ケイ灰石の直径を10μm〜60μmとしてもよい。
本発明では、針状ケイ灰石に対して次のような予備処理を行っている。すなわち、シランカップリング剤を用いて表面被覆処理を行い、フュームドシリカを用いて予備分散を行う。シランカップリング剤は、針状ケイ灰石に対して表面改質を施すことができ、セラミックス原料との相容性を強めることができる。フュームドシリカは、針状ケイ灰石に対して予備分散を行うことができる。これにより、針状ケイ灰石は、分散性が大幅に改良されるので、セラミックス原料において均一に散在されることができる。シランカップリング剤として、KH550、KH560、KH570を含むが、KH550とすることが好ましい。予備処理の具体的な方法の一例として、針状ケイ灰石は、表面改質装置にてシランカップリング剤(添加量0.1〜0.8%)を散布することによって改質剤被覆層を一つ形成し、そしてフュームドシリカ(添加量は0.1〜0.5%)と十分に混合して予備分散を行う。これらの添加量の百分率は、ともに針状ケイ灰石に対するものである。
以下、実施例を通じて、本発明をさらに詳しく説明する。同様に、以下の実施例は、本発明をさらに説明するためのものであり、本発明の特許範囲を制限するものではなく、当業者が本発明の上記内容によりなされた非本質的な改良及び調整は、共に本発明の特許範囲に属する。下記例の具体的なプロセス変量も適合範囲内の一例にすぎない。即ち、当業者は、本願の説明により適合範囲内で選ぶことができ、下記例の具体的な数値に限定されない。
セラミックス原料の配合比例は、水洗泥が15%、混合泥が10%、カリウム砂が16%、中温砂が28%、 1#ナトリウム砂が10%、2#ナトリウム砂が20%、黒滑石が1%であり、各原料の化学成分は上記表1に示されたとおりである。
予備処理された針状ケイ灰石の添加量を22%にすることのみ実施例1と異なる。最終に得たセラミックスプレートの製品仕様は1204mm×2407mm×5.4mmであって、製品の収縮率は5.6%、抗折強度は65Mpa、吸水率は0.34%であった。
予備処理された針状ケイ灰石の添加量を28%にすることのみ実施例1と異なる。最終に得たセラミックスプレートの製品仕様は1210mm×2420mm×5.6mmであって、製品の収縮率は5.1%、抗折強度は66Mpa、吸水率は0.45%であった。
予備処理された針状ケイ灰石の添加量を11%にすることのみ実施例1と異なる。最終に得たセラミックスプレートの製品(ビトリファイドタイル製品)仕様は1223mm×2445mm×5.5mmであって、製品の収縮率は4.1%、抗折強度は42Mpa、吸水率は9%であった。
予備処理された針状ケイ灰石の添加量を27%にすることのみ実施例1と異なる。最終に得たセラミックスプレートの製品(ビトリファイドタイル製品)仕様は1250mm×2449mm×5.5mmであって、製品の収縮率は2%、抗折強度は47Mpa、吸水率は6%であった。
針状ケイ灰石を添加せず、上記セラミックス原料のみを用いること以外、実施例1と同様にセラミックスプレートを製造した。最終に得たセラミックスプレート製品の仕様は1141mm×2282mm×5.4mmであって、製品の収縮率は10.5%、抗折強度は48Mpa、吸水率は0.23%であった。
実施例1に比べて、針状ケイ灰石を添加したが、針状ケイ灰石に対して予備処理をせず、他のステップは実施例1と同じようにした。その結果、針状ケイ灰石の分散均一性が非常に悪くなって、凝集体の温度が高すぎ、局部で焼結度の不一致を招き、製品が脆弱な部分で破断が発生しやすく、物理化学性能が悪くなった。最終に得たセラミックスプレート製品の仕様は1173mm×2346mm×5.5mmであって、製品の収縮率は8%で、抗折強度は48Mpaで、吸水率は0.6%であった。
Claims (11)
- (1)セラミックス原料粉体を製造する工程と、
(2)針状ケイ灰石を、シランカップリング剤を用いて表面被覆処理を行い、フュームドシリカを用いて予備分散を行うことによって、予備処理された針状ケイ灰石を得る工程と、
(3)セラミックス原料粉体と予備処理された針状ケイ灰石とを十分に混合して、造粒し、乾式プレス成形、焼成を行うことによって、低収縮かつ高強度である大型サイズのセラミックスプレートを製造し、そのうち、前記予備処理された針状ケイ灰石の添加量は前記セラミックス原料粉体の10wt%〜30wt%である工程と、を含む、ことを特徴とする低収縮かつ高強度である大型サイズのセラミックスプレートの製造方法。 - 工程(1)において、セラミックス原料の配合比例は、水洗泥が8〜20%、混合泥が4〜16%、カリウム砂が12〜20%、中温砂が24〜30%、 1#ナトリウム砂が6〜12%、2#ナトリウム砂が16〜22%、黒滑石が1〜2%であることを特徴とする請求項1に記載の製造方法。
- 工程(1)において、セラミックス原料粉体の製造方法として、各セラミックス原料を乾燥した後、予備粉砕し、120メッシュの篩に掛け、篩下を、配合比例に沿って混合して粉末化加工を行い、250メッシュの篩下が<2%となるように取り扱うことを特徴とする請求項1または2に記載の製造方法。
- 前記針状ケイ灰石の長さと直径の比が10〜18であることを特徴とする請求項1〜3の何れかに記載の製造方法。
- 工程(2)は、針状ケイ灰石に表面改質装置にてシランカップリング剤を分散することによって改質剤被覆層を一つ形成してから、フュームドシリカと十分に混合させて予備分散を行うことを含み、シランカップリング剤の添加量が針状ケイ灰石の0.1〜0.8wt%であり、フュームドシリカの添加量が針状ケイ灰石の0.1〜0.5wt%であることを特徴とする請求項1〜4の何れかに記載の製造方法。
- 前記シランカップリング剤は、KH550、KH560、KH570のうち少なくとも1つであることを特徴とする請求項1〜5の何れかに記載の製造方法。
- 工程(3)において、前記造粒は乾式造粒を用いて行うことを特徴とする請求項1〜6の何れかに記載の製造方法。
- 工程(3)において、前記乾式プレス成形の圧力が86000〜96000kNであり、成形仕様が(1150〜1300)mm× (2400〜2600)mm×(3〜6)mmであることを特徴とする請求項1〜7の何れかに記載の製造方法。
- 工程(3)において、焼成温度は1190〜1220℃であることを特徴とする請求項1〜8の何れかに記載の製造方法。
- 請求項1〜8の何れかに記載の製造方法によって製造された低収縮かつ高強度である大型サイズのセラミックスプレートであって、前記セラミックスプレーの仕様は(1100〜1260)mm×(2200〜2500)mm×(3〜6)mmであることを特徴とする低収縮かつ高強度である大型サイズのセラミックスプレート。
- 前記セラミックスプレートは磁器製品とビトリファイドタイル製品とを含み、前記磁器製品の収縮率が5〜8%であり、抗折強度が55〜68MPaであり、吸水率が0.5%より小さく、リファイドタイル製品の収縮率が1〜5%であり、抗折強度が40〜55MPaであり、吸水率が0.5%〜10%であることを特徴とする請求項10に記載の低収縮かつ高強度である大型サイズのセラミックスプレート。
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