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    Aluminum boron carbide composite and method to form said composite
    53.
    发明授权
    Aluminum boron carbide composite and method to form said composite 有权
    铝碳化硼复合材料和形成所述复合材料的方法

    公开(公告)号：US08030234B2

    公开(公告)日：2011-10-04

    申请号：US12575090

    申请日：2009-10-07

    Applicant: Aleksander J. Pyzik ,  Robert A. Newman ,  Mark A. Chartier ,  Amy M. Wetzel ,  Christopher N. Haney

    Inventor： Aleksander J. Pyzik ,  Robert A. Newman ,  Mark A. Chartier ,  Amy M. Wetzel ,  Christopher N. Haney

    IPC: C04B35/563 ,  C04B35/58

    CPC classification number: C04B35/563 ,  C04B2235/3821 ,  C04B2235/402 ,  C04B2235/5436 ,  C04B2235/661

    Abstract: An improved aluminum-boron carbide (ABC) composite has been discovered that is comprised of a continuous network of AlB24C4 and boron carbide grains having therein other isolated aluminum-boron carbide reactive phases and at most 2% by volume of isolated metal. The improved ABC composite may be formed by forming boron carbide particulates into a porous body that has a porosity of at most about 35%, where the boron particulates have been heat treated to a temperature of 1200° C. to 1800° C., infiltrating the porous body with aluminum or aluminum alloy until an infiltrated aluminum-boron carbide body is formed that has at most about 1% porosity, heat treating the infiltrated body for at least 25 hours at 1000° C. to 1100° C. to form an aluminum boron carbide composite having a continuous network of AlB24C4 and boron carbide, and subsequently heat-treating to 700° C. to 900° C. to form the improved aluminum boron carbide composite.

    Abstract translation: 已经发现了一种改进的碳化铝 - 碳化硼（ABC）复合材料，其由AlB24C4和碳化硼晶粒的连续网络组成，其中具有其它隔离的铝 - 碳化硼反应相和至多2体积％的隔离金属。 改进的ABC复合材料可以通过将碳化硼颗粒形成多孔体而形成，所述多孔体具有至多约35％的孔隙率，其中硼微粒被热处理至1200℃至1800℃，渗透 具有铝或铝合金的多孔体，直到形成渗透的铝 - 碳化硼体，其具有至多约1％的孔隙率，在1000℃至1100℃下将渗透体热处理至少25小时，以形成 铝碳化硼复合材料，其具有AlB24C4和碳化硼的连续网络，并随后热处理至700℃至900℃以形成改进的碳化硼复合材料。

    Method for Making Porous Acicular Mullite-Containing Composites
    54.
    发明申请
    Method for Making Porous Acicular Mullite-Containing Composites 有权
    制备多孔针状莫来石复合材料的方法

    公开(公告)号：US20110166018A1

    公开(公告)日：2011-07-07

    申请号：US13059990

    申请日：2009-09-18

    Applicant: Daniel Grohol ,  Chan Han ,  Aleksander J. Pyzik

    Inventor： Daniel Grohol ,  Chan Han ,  Aleksander J. Pyzik

    IPC: B01J32/00

    CPC classification number: C04B35/195 ,  C04B35/185 ,  C04B41/5025 ,  C04B2235/3463 ,  C04B2235/3481

    Abstract: Porous composites of mullite and cordierite are formed by firing an acicular mullite body in the presence of a magnesium source and a silicon source. In some variations of the process, the magnesium and silicon sources are present when the acicular mullite body is formed. In other variations, the magnesium source and the silicon source are applied to a previously-formed acicular mullite body. Surprisingly, the composites have coefficients of linear thermal expansion that are intermediate to those of mullite and cordierite alone, and have higher fracture strengths than cordierite at a similar porosity. Some of the cordierite forms at grain boundaries and/or points of intersection between mullite needles, rather than merely coating the needles. The presence of magnesium and silicon sources during acicular mullite formation does not significantly affect the ability to produce a highly porous network of mullite needles.

    Abstract translation: 莫来石和堇青石的多孔复合材料是通过在镁源和硅源的存在下焙烧针状莫来石体形成的。 在该方法的一些变型中，当形成针状莫来石体时，存在镁和硅源。 在其它变型中，将镁源和硅源施加到预先形成的针状莫来石体上。 令人惊奇的是，复合材料的线性热膨胀系数与莫来石和堇青石单体的中间相似，并且具有比类似孔隙率的堇青石更高的断裂强度。 在莫来石针之间的晶界和/或交叉点处的一些堇青石形式，而不仅仅是涂覆针。 在针状莫来石形成过程中镁和硅源的存在并不会显着影响产生莫来石针的高度多孔网络的能力。

    ALUMINUM BORON CARBIDE COMPOSITE AND METHOD TO FORM SAID COMPOSITE
    55.
    发明申请
    ALUMINUM BORON CARBIDE COMPOSITE AND METHOD TO FORM SAID COMPOSITE 有权
    碳酸钡复合材料和形成复合材料的方法

    公开(公告)号：US20100104843A1

    公开(公告)日：2010-04-29

    申请号：US12575090

    申请日：2009-10-07

    Applicant: Aleksander J. Pyzik ,  Robert A. Newman ,  Mark A. Chartier ,  Amy Wetzel ,  Christopher N. Haney

    Inventor： Aleksander J. Pyzik ,  Robert A. Newman ,  Mark A. Chartier ,  Amy Wetzel ,  Christopher N. Haney

    IPC: B32B5/16 ,  C09K3/00

    CPC classification number: C04B35/563 ,  C04B2235/3821 ,  C04B2235/402 ,  C04B2235/5436 ,  C04B2235/661

    Abstract: An improved aluminum-boron carbide (ABC) composite has been discovered that is comprised of a continuous network of AlB24C4 and boron carbide grains having therein other isolated aluminum-boron carbide reactive phases and at most 2% by volume of isolated metal. The improved ABC composite may be formed by forming boron carbide particulates into a porous body that has a porosity of at most about 35%, where the boron particulates have been heat treated to a temperature of 1200° C. to 1800° C., infiltrating the porous body with aluminum or aluminum alloy until an infiltrated aluminum-boron carbide body is formed that has at most about 1% porosity, heat treating the infiltrated body for at least 25 hours at 1000° C. to 1100° C. to form an aluminum boron carbide composite having a continuous network of AlB24C4 and boron carbide, and subsequently heat-treating to 700° C. to 900° C. to form the improved aluminum boron carbide composite.

    Abstract translation: 已经发现了一种改进的碳化铝 - 碳化硼（ABC）复合材料，其由AlB24C4和碳化硼晶粒的连续网络组成，其中具有其它隔离的铝 - 碳化硼反应相和至多2体积％的隔离金属。 改进的ABC复合材料可以通过将碳化硼颗粒形成多孔体而形成，所述多孔体具有至多约35％的孔隙率，其中硼微粒被热处理至1200℃至1800℃，渗透 具有铝或铝合金的多孔体，直到形成渗透的铝 - 碳化硼体，其具有至多约1％的孔隙率，在1000℃至1100℃下将渗透体热处理至少25小时以形成 铝碳化硼复合材料，其具有AlB24C4和碳化硼的连续网络，并随后热处理至700℃至900℃以形成改进的碳化硼复合材料。

    Self-reinforced silicon nitride ceramic of high fracture toughness
    60.
    发明授权
    Self-reinforced silicon nitride ceramic of high fracture toughness 失效
    自增强氮化硅陶瓷具有高断裂韧性

    公开(公告)号：US5160508A

    公开(公告)日：1992-11-03

    申请号：US826315

    申请日：1992-01-24

    Applicant: Aleksander J. Pyzik ,  Harold E. Rossow ,  Douglas B. Schwarz ,  Donald R. Beaman ,  Barbara M. Pyzik ,  William J. Dubensky

    Inventor： Aleksander J. Pyzik ,  Harold E. Rossow ,  Douglas B. Schwarz ,  Donald R. Beaman ,  Barbara M. Pyzik ,  William J. Dubensky

    IPC: C04B35/593 ,  C04B35/645 ,  C04B35/80

    CPC classification number: C04B35/593 ,  C04B35/645 ,  C04B35/806

    Abstract: A process for preparing a self-reinforced silicon nitride ceramic body of high fracture toughness comprising hot-pressing a powder mixture containing silicon nitride, a densification aid such as sodium oxide, a conversion aid such as lanthanum oxide and a compound, such as gallium oxide, which enhances growth of .beta.-silicon nitride whiskers-under conditions such that densification and the in situ formation of .beta.-silicon nitride whiskers having a high aspect ratio occur. A novel silicon nitride ceramic of high fracture toughness and high fracture strength is disclosed comprising a .beta.-silicon nitride crystalline phase wherein at least about 20 volume percent of the phase is in the form of whiskers having an average aspect ratio of at least about 2.5; a glassy second phase containing the densificaton aid, the conversion aid, the compound which enhances growth of .beta.-silicon nitride whiskers, and an amount of silica; and not greater than about 10 weight percent of the total weight as other phases. The glassy phase may also include a minor amount, e.g., up to 5.0 weight percent, based upon total weight of the ceramic, of aluminum nitride or boron nitride. The glassy phase optionally includes an amount of a secondary reinforcing material such as silicon carbide whiskers.

    Abstract translation: 一种制备高断裂韧性的自增强氮化硅陶瓷体的方法，包括热压含有氮化硅的粉末混合物，致密化助剂例如氧化钠，转化助剂如氧化镧和化合物如氧化镓 ，其增强了β-硅氮化物晶须的生长 - 在使得具有高纵横比的β-硅氮化物晶须的致密化和原位形成的条件下。 公开了一种具有高断裂韧性和高断裂强度的新型氮化硅陶瓷，其包括β-氮化硅结晶相，其中该相的至少约20体积百分数为晶须的形式，其平均纵横比为至少约2.5; 含有致密助剂的玻璃质第二相，转化助剂，增强β-硅氮化物晶须生长的化合物和一定量的二氧化硅; 并且不大于作为其它相的总重量的约10重量％。 玻璃相还可以包括少量，例如，基于陶瓷的总重量，至多5.0重量％的氮化铝或氮化硼。 玻璃相任选地包括一定量的第二增强材料，例如碳化硅晶须。

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