公开(公告)号：US6159885A

公开(公告)日：2000-12-12

申请号：US998384

申请日：1997-12-24

申请人： Ken-ichi Mizuno ,  Yoshihiro Yamamoto ,  Toru Shimamori ,  Kazuhisa Itakura

发明人： Ken-ichi Mizuno ,  Yoshihiro Yamamoto ,  Toru Shimamori ,  Kazuhisa Itakura

IPC分类号： C04B35/10 ,  C04B35/111

CPC分类号： C04B35/111

摘要： A homogeneous alumina-based sintered material having excellent grindability, low porosity and high flexural strength, and which is free of color unevenness and fluctuations in density. Predetermined amounts of Al.sub.2 O.sub.3 powder, MgO powder, CaCO.sub.3 powder and SiO.sub.2 powder are measured out, and then mixed with stirring in a ball mill. The mixture is granulated using a spray dryer, and then hydrostatically pressed to obtain a molded product having a predetermined shape. Subsequently, the molded product is stored and sintered at a temperature of 1,550.degree. C. to 1,650.degree. C., particularly 1,600.degree. C. to 1,650.degree. C. under atmospheric pressure for 2 hours. As a result, an alumina-based sintered material having a 50 percent cumulative grain size distribution in diameter of from 4 to 15 .mu.m, a 90 percent grain diameter of two to three times the 50 percent grain diameter, and a porosity of not more than 5% can be obtained. The alumina-based sintered material thus obtained exhibits a maximum load current during grinding of not more than 1.0 A/mm, particularly not more than 0.5 A/mm, and a four-point flexural strength of not less than 300 MPa, thus providing excellent grindability as well as high strength.

摘要翻译： 均匀的氧化铝基烧结体，其研磨性，孔隙率低，弯曲强度高，无颜色不均匀，密度波动。 测定预定量的Al 2 O 3粉末，MgO粉末，CaCO 3粉末和SiO 2粉末，然后在球磨机中搅拌混合。 使用喷雾干燥器将混合物造粒，然后进行水压加压，得到具有预定形状的成型体。 随后，在大气压下将成型产物在1550℃至1650℃，特别是1600℃至1650℃的温度下储存和烧结2小时。 结果，直径为4〜15μm的累积粒径分布为50％，90％粒径为50％晶粒直径2〜3倍的氧化铝系烧结体，不具有孔隙率 超过5％可以获得。 由此得到的氧化铝系烧结体在研磨时的最大负载电流为1.0A / mm以下，特别优选为0.5A / mm以上，4点弯曲强度为300MPa以上，因此提供优异的 可磨性以及高强度。

公开(公告)号：US6069105A

公开(公告)日：2000-05-30

申请号：US283979

申请日：1999-04-01

申请人： Yoshihiro Yamamoto ,  Katsura Matsubara ,  Toru Shimamori ,  Iazuhisa Itakura ,  Ken-ichi Mizuno

发明人： Yoshihiro Yamamoto ,  Katsura Matsubara ,  Toru Shimamori ,  Iazuhisa Itakura ,  Ken-ichi Mizuno

IPC分类号： C04B35/111 ,  H01B3/12 ,  C04B35/101 ,  H01P7/10

CPC分类号： H01B3/12 ,  C04B35/111

摘要： Disclosed is an alumina-based sintered material comprising a magnesium component, a calcium component, a silicon component, and a lithium component, wherein the content of the lithium component in terms of oxide amount is from 0.002 to 0.04% by weight based on the alumina-based sintered material.

摘要翻译： 公开了包含镁成分，钙成分，硅成分和锂成分的氧化铝系烧结体，其中锂成分的氧化物含量相对于氧化铝为0.002〜0.04重量％ 的烧结材料。

公开(公告)号：US5326733A

公开(公告)日：1994-07-05

申请号：US986563

申请日：1992-12-07

申请人： Ken-ichi Mizuno ,  Yo Tajima

发明人： Ken-ichi Mizuno ,  Yo Tajima

IPC分类号： B23P15/28 ,  C04B35/584 ,  C04B35/593 ,  C04B35/58

CPC分类号： C04B35/5935

摘要： A silicon nitride sintered product for use in cutting tools and the like which has silicon nitride as a predominant phase, and comprises 0.1 to 1% by weight of Al as calculated on the basis of Al.sub.2 O.sub.3, the total amount of sintering aid constituents other than Al being 6% by weight or less on the oxide basis, the content of the grain boundary glassy phase being 8% by volume or less. The silicon nitride sintered product preferably has a relative density of 99% or more.

摘要翻译： 一种氮化硅烧结产品，用于具有氮化硅作为主要相的切削工具等，并且包含基于Al 2 O 3计算的0.1至1重量％的Al，除Al之外的烧结助剂组分的总量 相对于氧化物为6重量％以下，晶界玻璃相的含量为8体积％以下。 氮化硅烧结体的相对密度优选为99％以上。