JP6160986B1 - セラミックス焼結体 - Google Patents
セラミックス焼結体 Download PDFInfo
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- JP6160986B1 JP6160986B1 JP2017504832A JP2017504832A JP6160986B1 JP 6160986 B1 JP6160986 B1 JP 6160986B1 JP 2017504832 A JP2017504832 A JP 2017504832A JP 2017504832 A JP2017504832 A JP 2017504832A JP 6160986 B1 JP6160986 B1 JP 6160986B1
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Abstract
Description
(1)酸化アルミニウムと、炭化タングステンと、酸化ジルコニウムとを含むセラミックス焼結体であって、前記酸化ジルコニウムは、ZrOおよびZrO2を含み、前記ZrO2は、正方晶および立方晶からなる群より選ばれる1種又は2種の結晶構造を有し、X線回折における、前記ZrOの(111)面のピーク強度をI1とし、正方晶の結晶構造を有するZrO2の、(101)面のピーク強度をI2tとし、立方晶の結晶構造を有するZrO2の(111)面のピーク強度をI2cとしたとき、I1とI2tとI2cとの合計に対するI1の比[I1/(I1+I2t+I2c)]が、0.05以上0.90以下であり、前記セラミックス焼結体の全体量に対して、前記酸化アルミニウムの含有量が、30体積%以上74体積%以下であり、前記炭化タングステンの含有量が、25体積%以上69体積%以下であり、前記酸化ジルコニウムの含有量が、1体積%以上20体積%以下である、セラミックス焼結体。
(2)I1とI2tとI2cとの合計に対するI1の比[I1/(I1+I2t+I2c)]が、0.20以上0.80以下である、(1)のセラミックス焼結体。
(3)前記酸化アルミニウムは、α型酸化アルミニウムであり、X線回折における前記α型酸化アルミニウムの(110)面のピーク強度をI3としたとき、I3に対するI2tとI2cとの合計の比[(I2t+I2c)/I3]が、0.30以上4.00以下である、(1)または(2)のセラミックス焼結体。
(4)前記酸化アルミニウムの平均粒径が0.20μm以上2.00μm以下である、(1)〜(3)のいずれかのセラミックス焼結体。
(5)前記炭化タングステンの平均粒径が0.10μm以上1.50μm以下である、(1)〜(4)のいずれかのセラミックス焼結体。
本実施形態のセラミックス焼結体に含まれる酸化アルミニウムの含有量が、セラミックス焼結体の全体量(100体積%)に対して30体積%以上になると、反応摩耗を抑制する効果が更に高まる傾向にあり、74体積%以下になると、耐摩耗性が更に向上する傾向にある。また、セラミックス焼結体に含まれる炭化タングステンの含有量が、セラミックス焼結体の全体量(100体積%)に対して25体積%以上、より好ましくは30体積%以上になると、耐摩耗性が更に向上する傾向にあり、69体積%以下になると、反応摩耗を抑制する効果が更に高まる傾向にある。さらに、セラミックス焼結体に含まれる酸化ジルコニウムの含有量が、セラミックス焼結体の全体量(100体積%)に対して1体積%以上になると、セラミックス焼結体の靱性が更に高まる傾向にあるため、耐欠損性が更に向上することがあり、20体積%以下になると、強度が更に高まる傾向にあるため、耐欠損性が更に向上することがある。
したがって、本実施形態のセラミックス焼結体において、その全体量に対して、酸化アルミニウムの含有量が、30体積%以上74体積%以下であり、炭化タングステンの含有量が、25体積%以上69体積%以下であり、酸化ジルコニウムの含有量が、1体積%以上20体積%以下であると好ましい。なお、炭化タングステンの含有量は、30体積%以上69体積%以下であるとより好ましい。
工程(A):平均粒径0.2〜2.0μmの酸化アルミニウム粉末29〜73体積%と、平均粒径0.05〜3.0μmの炭化タングステン粉末25〜69体積%と、平均粒径0.2〜2.0μmのZrO2粉末1〜20体積%と、平均粒径0.5〜5.0μmのAl粉末1〜5体積%とを配合(ただし、これらの合計は100体積%である)して原料粉を得る工程、
工程(B):工程(A)において配合した原料粉を、超硬合金製ボールにて5〜24時間の湿式ボールミルにより混合し、混合物を準備する工程、
工程(C):工程(B)において得られた混合物を所定の形状に成形して成形体を得る成形工程、
工程(D):工程(C)において得られた成形体を焼結炉に収容して、1600〜1800℃の範囲の焼結温度にて、アルゴンガス中で所定の時間保持し焼結してHIP前焼結体を得る工程、及び
工程(E):工程(D)において得られたHIP前焼結体を、1500〜1700℃の範囲の温度にて、100〜150MPaの圧力のアルゴンガス中で所定の時間保持しHIP処理して焼結体を得る工程。
また、ZrO2と、Al粉末とを高温で焼結することにより、ZrOを含む複合体を作製することができる。これは、下記式(1)で表される反応が進行したことにより、ZrOが形成されるためと考えられる。そこで、工程(A)において、ZrO2粉末と、Al粉末との割合を調整することにより、ZrOが形成される割合を制御することができる。
3ZrO2+2Al→3ZrO+Al2O3 (1)
上記反応を利用し、X線回折強度における各強度の比を所望の値に制御することができる。
切削方法:外周連続切削、
被削材:インコネル718(商標登録)、
被削材形状:円柱φ130mm×370mm、
切削速度:280m/min、
切込み:1.2mm、
送り:0.25mm/rev、
クーラント:湿式、
評価項目:試料が欠損したとき、または試料の最大逃げ面摩耗幅が0.3mmに至ったときを工具寿命とし、工具寿命に達するまでの加工(切削)時間を測定した。
切削方法:端面連続切削、
被削材:インコネル718(商標登録)、
被削材形状:円柱φ300mm×200mm、
切削速度:250m/min、
切込み:2.0mm、
送り:0.20mm/rev、
クーラント:湿式、
評価項目:試料が欠損に至ったときを工具寿命とし、工具寿命に達するまでの加工(切削)時間を測定した。
Claims (5)
- 酸化アルミニウムと、炭化タングステンと、酸化ジルコニウムとを含むセラミックス焼結体であって、
前記酸化ジルコニウムは、ZrOおよびZrO2を含み、
前記ZrO2は、正方晶および立方晶からなる群より選ばれる1種又は2種の結晶構造を有し、
X線回折における、前記ZrOの(111)面のピーク強度をI1とし、正方晶の結晶構造を有するZrO2の、(101)面のピーク強度をI2tとし、立方晶の結晶構造を有するZrO2の(111)面のピーク強度をI2cとしたとき、I1とI2tとI2cとの合計に対するI1の比[I1/(I1+I2t+I2c)]が、0.05以上0.90以下であり、
前記セラミックス焼結体の全体量に対して、
前記酸化アルミニウムの含有量が、30体積%以上74体積%以下であり、
前記炭化タングステンの含有量が、25体積%以上69体積%以下であり、
前記酸化ジルコニウムの含有量が、1体積%以上20体積%以下である、
セラミックス焼結体。 - I1とI2tとI2cとの合計に対するI1の比[I1/(I1+I2t+I2c)]が、0.20以上0.80以下である、請求項1に記載のセラミックス焼結体。
- 前記酸化アルミニウムは、α型酸化アルミニウムであり、
X線回折における前記α型酸化アルミニウムの(110)面のピーク強度をI3としたとき、I3に対するI2tとI2cとの合計の比[(I2t+I2c)/I3]が、0.30以上4.00以下である、請求項1または2に記載のセラミックス焼結体。 - 前記酸化アルミニウムの平均粒径が0.20μm以上2.00μm以下である、請求項1〜3のいずれか1項に記載のセラミックス焼結体。
- 前記炭化タングステンの平均粒径が0.10μm以上1.50μm以下である、請求項1〜4のいずれか1項に記載のセラミックス焼結体。
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