摘要:
A dielectric ceramic composition having a high dielectric constant and a coefficient of thermal expansion nearly comparable with that of alumina, and a package for packaging semiconductor. The dielectric ceramic composition contains 0.1 to 0.6 parts by weight of manganese reckoned as an oxide per 100 parts by weight of chief components of the formula xTiO.sub.2 .cndot.yMgO.cndot.zSrO or of the formula xTiO.sub.2 .cndot.yMgO.cndot.zCaO wherein x, y and z are numerals that lie within given ranges. The package for packaging semiconductor comprises a package body composed of alumina and having a semiconductor-mounting portion, and a capacitor made up of a dielectric layer and an electrode layer provided on said semiconductor-mounting portion, wherein the dielectric layer is composed of the TiO.sub.2 --MgO--SrO--MnO.sub.2 -type dielectric ceramic or the TiO.sub.2 --MgO--CaO--MnO.sub.2 -type dielectric ceramic.
摘要:
Provided are a zirconia sintered body that has excellent mechanical characteristics, as well as semiconductivity that can allow static electricity to escape at an appropriate rate, and a manufacturing method that can manufacture the same at lower cost than in the past. The zirconia sintered body is made of 66-90 parts by weight of zirconia that contains a stabilizer, and a total of 10-34 parts by weight of iron, chromium and titanium oxides. Of the iron, chromium and titanium oxides, the proportion of iron oxide is 70-99.5 wt %, the proportion of chromium oxide is 0.4-20 wt % and the proportion of titanium oxide is 0.1-10 wt %. The combined proportion of tetragonal and cubic crystals in the zirconia crystal phase is 90% or more and the mean crystal grain size of the zirconia is 0.3-0.5 μm. The mean crystal grain size of the iron, chromium and titanium oxides is 0.5-2.0 μm. It has excellent mechanical characteristics, as well as semiconductivity.
摘要:
A biomedical member having high strength, high toughness and high hardness and an artificial joint that uses the same are provided. In addition, a biomedical member that exhibits high wear resistance even in in vivo environment and an artificial joint are provided.Such a composite ceramic is used that contains 65% by weight or more Al2O3, 4 to 34% by weight of ZrO2 and 0.1 to 4% by weight of SrO, while Sr forms a solid solution with part of the ZrO2 grains. The composite ceramics further contains TiO2, MgO and SiO2 as sintering additives, while controlling the amounts to 0.20% by weight or more SiO2, 0.22% by weight or more TiO2 and 0.12% by weight or more MgO, and the total amount of SiO2, TiO2 and MgO within a range from 0.6 to 4.5% by weight.
摘要:
Composite ceramics having a high strength, a high toughness and an excellent abrasion resistance, and a method of producing the same. The composite ceramics comprises 10 to 30 mass % of a zirconia crystal phase including Ce-stabilized zirconia crystal particles which contain CeO2 in an amount of 9 to 12 mol % and Y-stabilized zirconia crystal particles which contain Y2O3 in an amount of 2.8 to 4.5 mol %; and 70 to 90 mass % of an alumina crystal phase, the zirconia crystal phase having an average crystal particle size of not larger than 1 μm.
摘要翻译:具有高强度,高韧性和优异耐磨性的复合陶瓷及其制造方法。 该复合陶瓷包含10〜30质量%的氧化锆结晶相,其含有Ce-N 2 O 3的Ce稳定化氧化锆结晶粒子,其含量为9〜12摩尔%,Y稳定化的氧化锆结晶粒子含有 Y 2 O 3 3,其量为2.8〜4.5摩尔%; 和70〜90质量%的氧化铝结晶相,所述氧化锆结晶相的平均结晶粒径不大于1μm。
摘要:
A circuit board and an electronic device having the circuit board that includes a ceramic sintered body, a through conductor and a metal wiring layer. The ceramic sintered body includes a through hole penetrating from a first main surface to a second main surface thereof. The through conductor is in the through hole and has first and second ends. The metal wiring layer covering the first end and electrically connected to the through conductor. The through conductor includes: a first portion having a hollow cylinder shape, in contact with an inner wall of the through hole and extending from the first end to the second end; and a second portion having a columnar shape and disposed inside the first portion. The second portion has an average grain size of the metal larger than that in the first portion.
摘要:
A circuit board and an electronic device having the circuit board that includes a ceramic sintered body, a through conductor and a metal wiring layer. The ceramic sintered body includes a through hole penetrating from a first main surface to a second main surface thereof. The through conductor is in the through hole and has first and second ends. The metal wiring layer covering the first end and electrically connected to the through conductor. The through conductor includes: a first portion having a hollow cylinder shape, in contact with an inner wall of the through hole and extending from the first end to the second end; and a second portion having a columnar shape and disposed inside the first portion. The second portion has an average grain size of the metal larger than that in the first portion.
摘要:
The present invention provides a dense, abrasion resistant ceramic. The ceramic of the invention includes alumina crystal particles and a grain boundary phase. The invention also includes an abrasion resistant sliding member and a pump comprising the same.
摘要:
Alumina/zirconia ceramics containing Al2O3 in an amount of not less than 65 mass % and ZrO2 in an amount of 4 to 34 mass %, and further containing TiO2, MgO and SiO2. The ceramics effectively suppresses the growth of shape isotropic particles of alumina, suppresses the growth of zirconia particles, and has a high strength and a high hardness. Besides, the ceramics containing SrO features a high fracture toughness.
摘要:
A thermally conductive compound which comprises 15 to 60 volume % of thermoplastic carrier resin consisting of a copolymer of a plasticizer with ethylene or of a polymer of the plasticizer, polyethylene and the copolymer, 40 to 85 volume % of thermally conductive filler particles dispersed in the carrier resin, and 0.5 to 5 weight % (for the filler particles) of a dispersing agent having (a) hydrophilic group(s) and (a) hydrophobic group(s). The thermally conductive compound has a high thermal conductivity and a plasticity in the range of temperatures of −40 to 50° C., and when it is interposed between an insulator body and a semiconductor element mounted thereon or between the semiconductor element and a cap, the heat generated by an operation of the semiconductor element is rapidly transferred and the thermal stress caused by the difference of coefficients of thermal expansion between the semiconductor element and the insulator body or cap is absorbed and relieved to cause no phase separation between them. The semiconductor device using the thermal compound, accordingly, is highly reliable.
摘要:
An aluminous sintered product comprising 70 to 96% by weight of an alumina component and 4 to 30% by weight of additives, said additives including at least the one selected from oxides of elements of the Group 5a of periodic table and at least the one selected from oxides of metals of the iron family and oxides of manganese, titanium, calcium, magnesium, chromium and silica, and said aluminous sintered product exhibiting a volume resistivity of from 1.times.10.sup.7 to 1.times.10.sup.13 .OMEGA.-cm over a temperature range of from 25.degree. to 75.degree. C. and an absolute value of the temperature coefficient of volume resistivity of not larger than 1.8%/.degree.C. under the application of high voltages. The sintered product is used as antistatic part such as conveyer arm, handling jig, tweezers for holding wafers and the like that must not be electrostatically charged in an apparatus for producing semiconductors, and as resistance substrate, electrically conducting material, contact, heater, part in vacuum tubes, and part for electron guns in a CRT such as of TVs and the like.