摘要:
A furnace for manufacturing ceramics is disclosed. The furnace contains a cylindrical heat resistant container, a furnace body for heating the cylindrical heat resistant container, and driving means for driving the cylindrical heat resistant container. The cylindrical heat resistant container rotates about a central shaft. At the same time, a first end and alternately a second end of the cylindrical heat resistant container are raised and lowered periodically, thus creating a seesaw motion while any material contained in the cylindrical heat resistant container is fired by the furnace body.
摘要:
The present invention relates to a method for manufacture of ceramic parts used for protecting semiconductor devices such as IC, LSI, etc. against anomalous high voltages such as noise, pulse, static electricity, etc. and the object of the present invention is to provide ceramic parts capable of removing or restraining high-frequency noises on signal lines by reducing the impedance of the devices.In order to attain the above object, according to the present invention, a pulse voltage of 50 kV in maximum value which requires a time of 200 nanoseconds or less for reaching the maximum value from an initial value and a time of 1 microsecond or less for returning to the initial value through the maximum value and which has an energy of 0.5 joule or lower is applied at least once between the electrodes (2).
摘要:
A method for manufacturing semiconductor-type laminated ceramic capacitors with a grain boundary-insulated structure including the steps of calcinating starting material of mixed powder in air or in nitrogen atmosphere after grinding, mixing and drying the mixed powder; forming raw sheets; printing a pattern of inner electrode paste on the surface of the raw sheets; calcinating the laminated body in air; sintering the laminated raw sheets in reducing atmosphere or in nitrogen atmosphere after calcination; re-oxidizing in air after sintering; and covering the edges of sintered ceramic sheets with outer electrode paste and baking after re-oxidation, terminals of inner electrodes being exposed to the edges, wherein: the starting material of mixed powder comprises a material of the composition Sr.sub.(1-x) Ba.sub.x TiO.sub.3 containing excess Ti to make a final molecular ratio of Ti to Sr.sub.(1-x) Ba.sub.x in the range of 0.95.ltoreq. Sr.sub.(1-x)Ba.sub.x /Ti
摘要:
The present invention provides a semiconductor-type laminated ceramic capacitor with a grain boundary-insulated structure made of Sr.sub.(1-x) Ba.sub.x TiO.sub.3 as a main component, comprising the functions of a conventional capacitor which absorbs low voltage noises and high frequency noises, and a varistor when high voltage noises and electrostatic charges invade, wherein simultaneous sintering of the materials of ceramic capacitor together with the materials of inner electrodes was made possible in the manufacturing process. Besides a material to be made semiconductive is added to the main component of Sr.sub.(1-x) Ba.sub.x TiO.sub.3 with excess Ti, the materials of Mn-Si, which are converted to MnO.sub.2 and SiO.sub.2 in the sintering process, are also added to the main component. According to the manufacturing method of the present invention, calcination process of laminated raw sheets prevents troubles occurring in laminated ceramic capacitors with varistor function, comprising: breaks of electric connections in inner electrodes; de-lamination of ceramic sheet; cracks in ceramic sheet; decrease of sintering density; and non-uniformity in the texture of sintered body. It improves electric characteristics, i.e. capacitance, voltage non-linearity coefficient .alpha. and varistor voltage, and is reliable. The present invention provides two major advantages in the composition of materials and in the manufacturing process.
摘要:
A semiconductor-type laminated ceramic capacitor with a grain boundary-insulated structure made of SrTiO.sub.3 as the main component, comprising the functions of a conventional capacitor which absorbs low voltage noises and high frequency noises, and a varistor when high voltage noises and electrostatic charges invade, wherein simultaneous sintering of the materials of the ceramic capacitor together with the materials of inner electrodes has been made possible in the manufacturing process. A material to be made semiconducting is added to the main component of SrTiO.sub.3 with an excess in Ti, the materials of Mn--Si, which are converted to MnO.sub.2 and SiO.sub.2 in the sintering process are also added to the main component.
摘要:
The present invention relates to an environmental condition sensor which is used to detect temperature etc., which sensor comprises an environmental condition sensor proper (1, 3,or 7), and a gas permeable structure (2 or 5) comprising .gamma.-MnO.sub.2, (Zn--Mn--FeO.sub.x) , and mAl.sub.2 O.sub.3.nCaO as the main composition thereof or an enamel layer (9) comprising .gamma.-MnO.sub.2, (Zn--Mn--FeOx), (.alpha.-Al.sub.2 O.sub.3.zeorite), and frit as the main composition thereof, which structure or layer surrounds the environmental condition sensor proper, so that carbon in oily smake and uncombustion gas striking the structure burns to prevent the oily smake and carbon from adhering to the environmental condition sensor proper (1, 3 or 7), whereby the degradation of the characteristics of the environmental condition sensor proper is avoided.
摘要:
A voltage-dependent resistor (varistor) of the bulk type comprising a sintered body consisting essentially of, as a main constituent, ZnO and additives of various metal oxides and further containing an additive of at least one of Al.sub.2 O.sub.3, In.sub.2 O.sub.3 Ga.sub.2 O.sub.3 provide much improved characteristics, especially superior limiting voltage ratio, surge resistance and life of the varistor.
摘要翻译:包含主要由ZnO和各种金属氧化物的添加剂和进一步含有Al 2 O 3,In 2 O 3 Ga 2 O 3中的至少一种的添加剂基本上组成的烧结体的电压相关电阻器(变阻器)提供了非常改进的特性 ,特别是极限电压比,耐压电阻和耐压电阻的寿命。