公开(公告)号：US20020041062A1

公开(公告)日：2002-04-11

申请号：US10017432

申请日：2001-12-14

发明人： Gerard E. Parker

IPC分类号： C04B035/10

CPC分类号： C04B35/111

摘要： The present invention includes a method for producing high-alumina bodies with superior chemical properties at reduced sintering temperatures. One form of the method includes the steps of providing an alumina powder precursor, adding about 2 wt. % magnesia powder precursor and about 2 wt. % titania powder precursor, mixing the resultant green powder precursor, pressing a green body from the green powder precursor, removing residual moisture and organic material from the green body, and firing the green body to about cone 13. The resulting high-alumina body has a substantially uniformly sized grain structure, is resistant to dissolution in molten aluminum, and has superior resistance to chemical attack over substantially the entire pH range.

公开(公告)号：US20020039959A1

公开(公告)日：2002-04-04

申请号：US09969443

申请日：2001-10-02

申请人： C-Max Technology, Inc.

发明人： Xi Yang

IPC分类号： C04B035/10 ,  C04B035/565 ,  C04B035/56

CPC分类号： C04B35/803 ,  B24C5/04 ,  C04B35/117 ,  C04B35/64 ,  C04B41/52 ,  F27D1/0006 ,  F27D1/16 ,  F27D3/16

摘要： The present invention provides a process for producing alumina matrix carbide and boride reinforced ceramic composites wherein for any particular composite, the relative density is about 97% or more of the theoretical density. The composites are prepared in a container wherein the interior surfaces of the container are graphite and have a protective coating consisting of a first layer comprising silicon carbide and boron carbide with a binder and a second layer comprising silicon carbide particles, wherein the protective coating prevents carbon bleed-through and the protective coating maintains a boride-containing equilibrium atmosphere during the process. The present invention further provides an alumina-based ceramic composite which comprises a metal carbide preferably selected from the group consisting of silicon carbide, titanium carbide and zirconium carbide, and mixtures thereof, and a boride preferably selected from the group consisting of boron carbide, titanium boride, or zirconium boride, and mixtures thereof. Finally, the present invention provides a protective coating for a surface comprising a first layer of a silicon carbide and a boron carbide in a binder and a second layer comprising a silicon carbide wherein the protective coating is able to withstand repeated exposure to high temperature.

公开(公告)号：US20020010071A1

公开(公告)日：2002-01-24

申请号：US09841619

申请日：2001-04-23

发明人： Michael Cohen

IPC分类号： C04B035/10 ,  C04B035/48

CPC分类号： C04B35/1115 ,  C04B35/111 ,  F41H5/0492

摘要： The invention provides a sintered, alumina ceramic product comprising about 90-97.5 w/w % Al2O3, about 0.5-1.0 w/w % MgO, about

摘要翻译： 本发明提供一种包含约90-97.5w / w％Al 2 O 3，约0.5-1.0w / w％MgO，约0.05-1.0w / w％SiO 2，约4.5-7.5w / w％ZrO 2的烧结氧化铝陶瓷产品 和约0.07-0.13w / w％的HfO 2。

公开(公告)号：US20010046935A1

公开(公告)日：2001-11-29

申请号：US09818268

申请日：2001-03-26

发明人： Takeshi Okamura

IPC分类号： C04B035/10 ,  C04B035/18 ,  C04B035/50

CPC分类号： H01P3/165 ,  C04B35/10 ,  C04B35/18 ,  C04B35/20 ,  C04B35/50 ,  H01P7/10 ,  H05K1/0306

摘要： An object of the invention is to provide a dielectric porcelain composition with low rate of phase change of a cordierite phase as a primary crystal phase, in which as a result of the low rate of phase change the dielectric constant is from 4.5 to 6 and Q value is 1,000 or more at 60 GHz, and to provide a dielectric resonator and nonradiative dielectric strip using the same. The dielectric porcelain composition comprises, as a principal component, a complex oxide having a molar composition xMgO.yAl2O3.zSiO2 (wherein 10nullxnull40, 10nullynull40, 20nullznull80 , and xnullynullznull100), and a ratio of a (241) peak intensity nullp(241) and a (222) peak intensity nullp(222) of X-ray diffraction of a null phase of a 2MgO.2Al2O3.5SiO2 phase, which is a primary crystalline phase of the complex oxide, is 0.8nullnullp(241)/nullp(222)null1.3.

摘要翻译： 本发明的目的是提供一种以堇青石相为主晶相的低相变速率的电介质瓷组合物，其中由于相变速率低，介电常数为4.5〜6，Q 在60GHz时的值为1000以上，并且提供使用其的介质谐振器和非辐射介质条。 电介质瓷组合物包含具有摩尔组成为xMgO.yAl2O3.zSiO2（其中10≤x≤40,10≤y≤40,20≤z≤80的复合氧化物作为主要组分，和 x + y + z = 100），以及2MgO·2·Al 2 O 3·5SiO 2的β相的X射线衍射的（241）峰强度betap（241）和（222）峰强度betap（222） 相是复合氧化物的主结晶相，为0.8 <= betap（241）/ betap（222）<= 1.3。