Abstract:
There is disclosed a honeycomb filter which can increase a maximum amount of soot to be deposited and realize a high durability while suppressing increase of a pressure loss. A honeycomb filter 100 includes a tubular honeycomb structure 4 having porous partition walls 1 with which there are formed a plurality of cells 2 extending from one end surface to the other end surface to become through channels of a fluid; and plugged portions 5 arranged in one open end portion of each of predetermined cells 2a and the other open end portion of each of the remaining cells, porosities of the partition walls 1 are 46% or less, a permeability of the honeycomb structure 4 is 0.8 µm 2 or more, a pore volume ratio of pores having pore diameters of 40 µm or more is 7.5% or less, and a pore volume ratio of pores having pore diameters of 10 µm or less is 25% or less, and a coefficient of thermal expansion of the honeycomb structure 4 in a range of 40 to 800°C is 1.0×10 -6 /°C or less.
Abstract:
Gebrannte, feuerfeste Gasspülsteine aus porösem Magnesiamaterial, die zum Einleiten von Gasen und Dämpfen in Metallschmelzen dienen, werden zur Erzielung einer Gasdurchlässigkeit von mindestens 500 nPm, einer offenen Porosität von mindestens 20 Vol.-%, sowie ausreichender Kaltdruckfestigkeit und hoher Heißfestigkeit dadurch hergestellt, daß eine Mischung aus 87 bis 95 Gew.-% Sintermagnesia in der Körnung von 0,5 bis 3 mm und 5 bis 13 Gew.-% Karbonat oder Hydrat von Magnesium oder Calcium, insbesondere Rohmagnesit der Körnung von 0 bis 1 mm, als gasabgebendem Stoff mit einem temporären Bindemittel, z.B. einer Magnesiumsulfatlösung, unter einem Preßdruck von 50 bis 100 N/mm 2 zu Steinen gepreßt wird und diese bei einer Temperatur über 1700°C gebrannt werden. Die Sintermagnesia und der gasabgebende Stoff werden in eisenarmer Form mit weniger als 0,8 Gew.-% Fe 2 O 3 , glühverlustfrei gerechnet, eingesetzt.
Abstract translation:1.一种用于制造用于将气体或蒸汽引入金属熔体的用于冲洗的烧制耐火多孔塞的方法,包括具有至少500nPm的渗透性和至少20体积%的开放孔隙率的多孔氧化镁材料,通过 将基于烧结氧化镁的混合物压制成型,其基本上不含最高0.5mm的最细颗粒,其特征在于由87-95%重量的晶粒尺寸为0.5至3mm的烧结氧化镁组成的混合物,优选为1 至2重量%和5至13重量%的碳酸钙或碳酸钙作为气体输送物质,烧结氧化镁和气体输送物质的Fe含量低于0.8重量%的Fe 2 O 3,其自由计算值 与临时粘合剂混合的灼烧损失在50至100N / mm 2 **,优选约60N / mm 2/2的压力下成形为塞子,并且这些塞子在高于1700℃的温度下烧制, 优选1800以上 摄氏度
Abstract:
A gas-permeable thermal insulator comprising a porous ceramic body (11) of a three-dimensional reticulate structure having interconnected open cells (12) is adapted to be Installed in a heating oven or radiant tube so that exhaust gas passes through the insulator to exit the oven or tube while the waste heat of the gas is effectively recovered for reuse. The porous ceramic body is characterized by a bulk specific gravity of 0.25-0.6, an average pore diameter of 0.2-10 mm, a porosity of 75-95%, and an air pressure drop of 0.1-40 mm in water column when air passes through the body over a thickness of 1 cm at a velocity of 1 m/sec.
Abstract:
A gas-permeable thermal insulator comprising a porous ceramic body (11) of a three-dimensional reticulate structure having interconnected open cells (12) is adapted to be Installed in a heating oven or radiant tube so that exhaust gas passes through the insulator to exit the oven or tube while the waste heat of the gas is effectively recovered for reuse. The porous ceramic body is characterized by a bulk specific gravity of 0.25-0.6, an average pore diameter of 0.2-10 mm, a porosity of 75-95%, and an air pressure drop of 0.1-40 mm in water column when air passes through the body over a thickness of 1 cm at a velocity of 1 m/sec.