摘要:
A porous sintered body composed mainly of lanthanum manganite in which a part of lanthanum atoms at A-sites of the lanthanum manganite are substituted by atoms of a metal selected from the group consisting of alkaline earth metals and rare earth metals. The dimensional shrinkage amount of the porous sintered body in heat cycling between room temperature and 1,000.degree. C. is not more than 0.01% per one heat cycle.
摘要:
A process for the production of a lanthanum chromite film, including the steps of preparing a plasma spray powder by mixing 1-15 parts by weight of powdery chromium oxide powder to 100 parts by weight of powdery lanthanum chromite, this lanthanum chromite having a composition ratio of A sites to B-sites being in a range of 1:1 to 1:0.9, forming a plasma sprayed film by plasma spraying the plasma spray powder onto a substrate, and forming the lanthanum chromite film by heat treating the resulting plasma sprayed film. The plasma spray powder may be produced by preparing a mixed powder by adding 1-15 parts by weight of powdery chromium oxide to 100 parts by weight of a synthesis powder capable of producing the lanthanum chromite film by heat treatment, the synthesis powder containing at least chromium oxide and lanthanum chromite and the lanthanum chromite film having a composition ratio of A-sites to B-sites being in a range of 1:1 to 1:0.9, obtaining a synthesized product by heating the mixed powder, and granulating the synthesized product.
摘要:
A high density SiC sintered body can be obtained by molding a mixture of two kinds of high temperature-type and low temperature-type silicon carbides together with sintering aids into a shaped article, primarily firing the shaped article, and subjecting the primarily sintered body to an HIP treatment.
摘要:
A silicon carbide porous object includes silicon carbide as an aggregate and metal silicon as a binder, the particles of silicon carbide being bonded to one another so as to have pores thereamong. A method for producing a silicon carbide porous object includes: firing raw materials formed by mixing silicon carbide and metal silicon with metal aluminum or an alloy including metal silicon and metal aluminum in an inert gas atmosphere or a reduced-pressure atmosphere to produce a metal aluminum-metal silicon-silicon carbide porous object; and oxidizing and firing the metal aluminum-metal silicon-silicon carbide porous object in an oxygen atmosphere.
摘要:
A saddle seat type fuel-cell electric vehicle includes a body frame having a pair of right and left main frames connected at their front ends to a head pipe and extending downward therefrom and a pair of right and left under frames connected at their front ends to the head pipe and extending downward therefrom along the right and left main frames on the lower side thereof. A pair of hydrogen cylinders extend substantially vertically along the body frame between the front side of the head pipe and the front side of the front end portion of the footrest so as to interpose the body frame in the lateral direction of the vehicle. A fuel supply unit is provided in a space surrounded by the main frames and the under frames with the hydrogen cylinders being surrounded by a guard pipe connected to the main frames.
摘要:
There is provided a silicon carbide porous article containing silicon carbide particles as an aggregate and an oxide as a bonding material. The silicon carbide particles are bonded together in a state that pores are held among the silicon carbide particles, and an additive amount of the oxide is 0.5 g/m2 or more and below 3.0 g/m2 with respect to a surface area of the silicon carbide particles.
摘要翻译:提供了一种碳化硅多孔制品,其包含碳化硅颗粒作为骨料,氧化物作为粘结材料。 在碳化硅颗粒之间保持有孔的状态下,碳化硅颗粒结合在一起,相对于碳化硅的表面积,氧化物的添加量为0.5g / m 2以上且3.0g / m 2以下 粒子。
摘要:
A catalyst body including a catalytic material containing an alkali metal and/or an alkaline earth metal, a carrier carrying the catalytic material, and a method of manufacturing the catalyst body are provided. The carrier has a cordierite binder phase and aggregate phases dispersed in the cordierite binder phase.
摘要:
A honeycomb structure that is a plurality of honeycomb segments (21) bonded into one piece by a bonding material (25), the honeycomb segments (21) each having a large number of through-channels (11) separated from each other by partition walls (20), the bonding material (25) being composed of components substantially the same as components composing the unified body of honeycomb segments (21), and the honeycomb segments (21) being bonded to each other at their planes substantially parallel to the direction of channels of through- channels (11), in which honeycomb structure each bonded plane (22) of each honeycomb segment (21) has a structure possessing an unbonded area (12) containing at least an edge portion opening to a periphery of its gas inlet side end face (15) and/or a periphery of its gas outlet side end face (17). With this honeycomb structure, there is no cracking caused by the thermal stress during the use, and excellent durability can be obtained.
摘要:
The honeycomb structural body according to the present invention is the honeycomb structural body 1, in which a plurality of cells 3, penetrating between a pair of end faces 4, 5 in the direction of the A axis and functioning as fluid passages, is formed and cordierite as a main constituent of cell walls 2 consists, in a chemical composition, of 30˜45% by mass of alumina (Al2O3), 11˜17% by mass of magnesia (MgO) and 42˜57% by mass of silica (SiO2), and the honeycomb structural body of the present invention is possessed of the following physical properties (1) through (5): (1) porosity: 55˜75%, (2) open frontal area: 0.55 or more, less than 0.65, (3) mean pore size: 20˜30 μm, (4) compression strength in the A axis: 2.0 MPa or more, and (5) a ratio of the “compression strength in the A axis/Young's modulus”: 1.2×10−3 or more.
摘要翻译:根据本发明的蜂窝结构体是蜂窝结构体1,其中形成有在A轴方向上穿过一对端面4,5之间并用作流体通道的多个单元3,并且 作为细胞壁2的主要成分的堇青石以化学组成为30〜45质量%的氧化铝(Al 2 O 3 O 3),11〜17质量% 的氧化镁(MgO)和42〜57质量%的二氧化硅(SiO 2/2),本发明的蜂窝结构体具有以下物理性质(1)〜(5 ):(1)孔隙率:55〜75%,(2)开口额面积:0.55以上,小于0.65,(3)平均孔径:20〜30μm,(4)A轴压缩强度:2.0 MPa以上,(5)“A轴的压缩强度/杨氏模量”的比例为1.2×10 -3以上。
摘要:
A silicon carbide based porous material (1) containing silicon carbide particles (2) as an aggregate and metallic silicon (3) as a bonding material and having a number of pores (5) formed by them, characterized in that it has an oxide phase (4) in at least a part of the pore (5), and the oxide phase (4) contains respective oxides of silicon, aluminum and an alkaline earth metal and contains substantially no alkaline earth metal silicate crystal phase; a method for producing the above porous material; and a honeycomb structure comprising the silicon carbide based porous material. The above porous material is capable of effectively inhibiting the corrosion by an acid (especially acetic acid) used in the operation of carrying a catalyst, that is, is improved in the resistance to an acid.