公开(公告)号：EP1279650B1

公开(公告)日：2015-09-30

申请号：EP02255118.8

申请日：2002-07-22

申请人： NGK Spark Plug Company Limited

发明人： Yamamoto, Hiroshi ,  Mitsuoka, Takeshi ,  Urashima, Kazuhiro

IPC分类号： C04B35/117 ,  C04B35/50 ,  C04B35/505

CPC分类号： C04B35/50 ,  C04B35/117 ,  C04B35/505

公开(公告)号：EP1053983B1

公开(公告)日：2007-09-12

申请号：EP00304268.6

申请日：2000-05-19

申请人： NGK Spark Plug Company Limited

发明人： Yamamoto, Hiroshi ,  Mitsuoka, Takashi ,  IIO, Satoshi

IPC分类号： C04B35/115 ,  H01J5/04

CPC分类号： C04B35/115 ,  C04B35/6455 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3227 ,  C04B2235/3244 ,  C04B2235/3251 ,  C04B2235/3272 ,  C04B2235/3418 ,  C04B2235/5436 ,  C04B2235/656 ,  C04B2235/77 ,  C04B2235/785 ,  C04B2235/788 ,  C04B2235/96 ,  C04B2235/963 ,  H01J5/04 ,  H01J61/302 ,  H01J61/825

公开(公告)号：EP1053983A3

公开(公告)日：2001-07-04

申请号：EP00304268.6

申请日：2000-05-19

申请人： NGK Spark Plug Company Limited

发明人： Yamamoto, Hiroshi ,  Mitsuoka, Takashi ,  IIO, Satoshi

IPC分类号： C04B35/115 ,  H01J5/04

CPC分类号： C04B35/115 ,  C04B35/6455 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3227 ,  C04B2235/3244 ,  C04B2235/3251 ,  C04B2235/3272 ,  C04B2235/3418 ,  C04B2235/5436 ,  C04B2235/656 ,  C04B2235/77 ,  C04B2235/785 ,  C04B2235/788 ,  C04B2235/96 ,  C04B2235/963 ,  H01J5/04 ,  H01J61/302 ,  H01J61/825

摘要： An translucent polycrystalline ceramic is disclosed which is capable of transmitting visible light and which is excellent in strength, hardness, abrasion resistance, light transmittance, transparency and high-temperature characteristics and usable as a material, for instance, for cutting tools, outer tubes for high pressure sodium lamps and high temperature furnace window plates. The translucent polycrystalline ceramic has a mean facet length of crystal particles formed inside the ceramic not longer than a maximum wave length of the light to be transmitted through it. One of the embodiments is a translucent polycrystalline Al 2 O 3 ceramic containing 0.02 - 2.0mol% of oxide of metal belonging to group IIIA and/or IVA (excluding Ti), having its density of at least 3.98g/cm 3 , a mean crystal particle size of 0.3 - 1.0µm, its bending strength of at least 1900 MPa and its Vickers hardness of at least 850 at 1000°C.

公开(公告)号：EP1053983A2

公开(公告)日：2000-11-22

申请号：EP00304268.6

申请日：2000-05-19

申请人： NGK Spark Plug Company Limited

发明人： Yamamoto, Hiroshi ,  Mitsuoka, Takashi ,  IIO, Satoshi

IPC分类号： C04B35/115

CPC分类号： C04B35/115 ,  C04B35/6455 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3227 ,  C04B2235/3244 ,  C04B2235/3251 ,  C04B2235/3272 ,  C04B2235/3418 ,  C04B2235/5436 ,  C04B2235/656 ,  C04B2235/77 ,  C04B2235/785 ,  C04B2235/788 ,  C04B2235/96 ,  C04B2235/963 ,  H01J5/04 ,  H01J61/302 ,  H01J61/825

摘要： An translucent polycrystalline ceramic is disclosed which is capable of transmitting visible light and which is excellent in strength, hardness, abrasion resistance, light transmittance, transparency and high-temperature characteristics and usable as a material, for instance, for cutting tools, outer tubes for high pressure sodium lamps and high temperature furnace window plates.
The translucent polycrystalline ceramic has at least one of the following characteristic features: (1) a mean particle size of crystal particles formed inside the ceramic is not larger than 1.0 µm, (2) a mean aspect ratio thereof is from 1.0 to 1.5. (3) a density thereof is substantially a theoretical density, (4) a light transmittance through its thickness of 1 mm is at least 50%, (5) a mean facet length of crystal particles formed inside the ceramic is not longer than a maximum wave length of the light.
One of the embodiments is a translucent polycrystalline Al 2 O 3 ceramic containing 0.02 - 2.0 mol% of oxide of metal belonging to group IIIA and/or IVA (excluding Ti), having its density of at least 3.98 g/cm 3 , a mean crystal particle size of 0.3 - 1.0 µm, its bending strength of at least 1900 MPa and its Vickers hardness of at least 850 at 1000°C.

摘要翻译： 公开了一种半透明多晶陶瓷，其能够透射可见光，其强度，硬度，耐磨性，透光率，透明度和高温特性优异，可用作切割工具的材料，例如用于切割工具的外管 高压钠灯和高温炉窗板。 半透明多晶陶瓷具有以下特征中的至少一个：（1）陶瓷内形成的结晶粒子的平均粒径不大于1.0μm，（2）其平均纵横比为1.0〜1.5。 （3）其密度基本上是理论密度，（4）通过其厚度1mm的透光率至少为50％，（5）在陶瓷内部形成的晶体颗粒的平均面长度不大于最大值 光线的长度。 其中一个实施例是一种半透明多晶Al 2 O 3陶瓷，其含有0.02-2.0摩尔％的属于IIIA族和/或IVA族（不包括Ti）的金属的氧化物，其密度至少为3.98g / cm 3，平均晶体 粒径为0.3-1.0μm，其弯曲强度至少为1900MPa，维氏硬度在1000℃下至少为850。