Abstract:
The disclosed ceramic sliding member has one sliding plane formed by ceramic member and the other sliding plane made of a metal member coated with a composition of Cu and LiF to which the ceramic sliding plane is faced, and possesses small weight loss and low max wear depth on a friction and wear test. Therefore, it is preferable use the ceramic sliding member in applications such as tappet/cam, rocker arm/cam, valve/valve seat and linear/piston ring.
Abstract:
A turbine rotor including a turbine vane wheel made of ceramics, a ceramic shaft formed integrally with the turbine wheel, and a metallic shaft bonded to the ceramic shaft. The hardness of a part of or the whole part of a compressor wheel-fitting shaft portion of the metallic shaft is made smaller than that of a portion of metallic shaft apart from the compressor wheel-fitting shaft, said portion being located on the turbine vane wheel side. Thereby, slackening between the compressor wheel and the fitting shaft is avoided. Methods of producing the turbine rotor are also disclosed.
Abstract:
A ceramic valve seat is disclosed herein. A face portion of the valve seat at which the valve seat is to contact with a valve is made of a ceramic material. At least edge portions of the valve-contacting face portion of the valve seat are rounded. By so constructing, impact force due to contact between the valve and the valve seat and stress concentration can be mitigated.
Abstract:
High strength porcelain having an unglazed bending strength of greater than 1,400 kg/cm.sup.2 and consisting essentially of 22-85% by weight of SiO.sub.2, 10-73% by weight of Al.sub.2 O.sub.3, and 1.5-6.5% by weight of K.sub.2 O and/or Na.sub.2 O. The porcelain has a total degree of crystallinity of more than 40% by weight, and a crystalline grain size of not greater than 20 .mu.m, and it is free from defects of larger than 40 .mu.m. The procelain is produced by pulverizing a starting material mixture of quartz-feldspar-alumina system so that 85-95% by weight of particles thereof have a grain size of not greater than 10 .mu.m, calcining the mixture, adding clay-mineral material therein, pulverizing so that the clay-mineral-added mixture contains less than 85% by weight of particles with a grain size of not greater than 10 .mu.m, forming, drying, and firing at 1,100.degree.-1,400.degree. C.
Abstract:
A sealing composition consisting of 35-50% by weight of aluminum oxide, 35-50% by weight of calcium oxide, 1-10% by weight of yttrium oxide and 1-15% by weight of strontium oxide has a high wettability with alumina ceramics and refractory metal, and further has high heat resistance and resistance against sodium vapor. The sealing composition is excellent for sealing alumina arc tubes for high intensity discharge lamps with ceramics or refractory metal. Included within the scope of the invention is a composition consisting of 40-50% by weight of aluminum oxide, 35-43% by weight of calcium oxide, 3-10% by weight of yttrium oxide and 8-15% by weight of strontium oxide, as well as methods for using the compositions.
Abstract:
The present invention relates to low-expansion ceramics essentially consisting of 1.5 to 20% by weight of magnesia (MgO), 8 to 68% by weight of alumina (Al.sub.2 O.sub.3), 24 to 80% by weight of titanium in terms of titanium oxide (TiO.sub.2), and 0.5 to 20% by weight of iron in terms of ferric oxide (Fe.sub.2 O.sub.3), that major component of crystalline phase thereof is a solid solution of magnesium oxide-aluminum oxide-titanium dioxide-iron oxide, and that the ceramics has a coefficient of thermal expansion of not more than 20.times.10.sup.-7 (1/.degree. C.) in a temperature range of 25.degree. C. to 800.degree. C. and a melting point of not lower than 1,500.degree. C., said coefficient of thermal expansion being maintained even after exposure 1,100.degree. C. for 1,000 hours, and a method of producing low-expansion ceramics comprising steps of preparing a batch of compounds so as to provide a chemical composition of 1.5 to 20% by weight of magnesia (MgO), 8 to 68% by weight of alumina (Al.sub.2 O.sub.3), 24 to 80% by weight of titanium in terms of titanium oxide, and 0.5 to 20% by weight of iron in terms of ferric oxide (Fe.sub.2 O.sub.3); plasticizing the batch if necessary and shaping the batch; drying the body thus formed and firing the formed body at 1,300.degree. C. to 1,700.degree. C. for 0.5 to 48 hours, thereby having a coefficient of thermal expansion of less than 20.times.10.sup.-7 (1/.degree. C.) in a temperature range of 25.degree. C. to 800.degree. C. and a melting point of not lower than 1,500.degree. C., said coefficient of thermal expansion being maintained even after exposure at 1,100.degree. C. for 1,000 hours, wherein the shape of ceramics is a honeycomb structure.
Abstract translation:本发明涉及基本上由氧化镁(MgO)1.5〜20重量%,氧化铝(Al 2 O 3)8〜68重量%,氧化钛换算为24〜80重量%的钛的低膨胀性陶瓷 TiO 2)和0.5〜20重量%的以氧化铁(Fe 2 O 3)计的铁,其结晶相的主要成分是氧化镁 - 氧化铝 - 二氧化钛 - 氧化铁的固溶体,陶瓷具有 在25℃至800℃的温度范围内,热膨胀系数不大于20×10 -7(1 /℃),熔点不低于1500℃,所述热导率 即使在1100℃下曝光1000小时后,也保持膨胀,以及生产低膨胀陶瓷的方法,包括制备一批化合物的步骤,以提供1.5至20重量%的氧化镁(MgO)的化学组成, ,8〜68重量%的氧化铝(Al 2 O 3),24〜80重量%的钛 氧化钛,以氧化铁(Fe 2 O 3)换算为0.5〜20重量%的铁。 必要时对批料进行塑化并成型; 干燥所形成的本体,并将成形体在1300℃至1700℃下焙烧0.5至48小时,从而在温度范围内具有小于20×10 -7(1 /℃)的热膨胀系数 25℃至800℃,熔点不低于1500℃,即使在1100℃下暴露1000小时之后,仍保持热膨胀系数,其中陶瓷的形状为蜂窝状 结构体。
Abstract:
A metallic slide member is disclosed which is advantageously used in combination with an opponent ceramic slide member. The metallic slide member is capable of forming a metal coat lubricating layer on a sliding surface of the ceramic slid member through a metal at a sliding surface of the metallic slide member being transferred onto the ceramic slide member when the metallic slide member slide relative to the ceramic member. Thereby, excellent wear resistance of the metallic slide member can be maintained with respect to the ceramic slide member.
Abstract:
Ceramic-metal composite bodies are disclosed, which are each formed by joining a projection on a ceramic member to a recess or a through hole formed in a metallic member together. A groove portion is provided substantially all around the outer periphery of the metallic member such that a fitting end of the metallic member is located in a position corresponding to the groove portion. A difference between a diameter of a bottom of the groove portion and an outer diameter of the projection of the ceramic member is 0.05 to 0.8 times as large as a difference between an outer diameter of the metallic member and the outer diameter of the projection of the ceramic member.
Abstract:
A metal-ceramic composite body is produced by fitting a protruding portion of a ceramic member into a concave portion of an intermediate member and joining the intermediate member to a metallic member. In this case, a difference between the inner diameter in the concave portion of the intermediate member and the outer diameter in the protruding portion of the ceramic member is not less than 0.2% of the outer diameter in the protruding portion when the protruding portion is pulled out from the concave portion.
Abstract:
Slide assemblies, which each include a metallic member and a ceramic member to slide with the metallic member. The metallic member has a sliding surface coated with a mixture consisting essentially of a solid lubricant and a binder. The mixture of the solid lubricant and the binder is a combination selected from the group consisting of LiF+MoO.sub.3, PbO+Cu, MoS.sub.2 +Cu, LiF+Ni--Cr--Mo--Si, and LiF+Co--Mo--Cr--Si. Silicon nitride, sialon, mullite, partially stabilized zirconia, or silicon carbide is preferably used as the ceramic member. The slide assemblies exhibit excellent high frictional resistance and wearing resistance even in dry condition at high temperatures.