摘要:
The method for producing a fired body of the invention has the steps of: preparing a starting material mixture; molding the mixture to obtain a green molded body; a first heating step to make the molded body contain residual carbon-containing substances in a furnace by increasing the temperature of the furnace while introducing an oxygen containing gas; and a second heating step to obtain a fired body by further increasing the temperature of the furnace without introducing the oxygen containing gas; wherein the conditions for the first heating step are set so that when the molded body is allowed to stand after the first heating step in an oxygen-containing atmosphere at 900° C., the temperature at the center section of the molded body is at least 20° C. higher than the temperature of the atmosphere in the furnace.
摘要:
An activated alumina formed body with a high bulk density and a large macro-pore volume is provided. The activated alumina formed body can be produced by a method comprising the steps of calcining a gibbsite-phase aluminum hydroxide having a median particle size of from about 10 μm to about 35 μm and a packed bulk density of from about 1.05 g/cm3 to about 1.3 g/cm3 to obtain an at least partially rehydratable alumina powder; forming the rehydratable alumina powder in the presence of water; maintaining the formed body in the presence of water to rehydrate the formed body; and calcining the rehydrated formed body to obtain an activated alumina formed body. The activated alumina formed body is usable as an adsorbent, a catalyst supporting precious metal or the like.
摘要:
The method for producing a fired body of the invention has the steps of: preparing a starting material mixture; molding the mixture to obtain a green molded body; a first heating step to make the molded body contain residual carbon-containing substances in a furnace by increasing the temperature of the furnace while introducing an oxygen containing gas; and a second heating step to obtain a fired body by further increasing the temperature of the furnace without introducing the oxygen containing gas; wherein the conditions for the first heating step are set so that when the molded body is allowed to stand after the first heating step in an oxygen-containing atmosphere at 900° C., the temperature at the center section of the molded body is at least 20° C. higher than the temperature of the atmosphere in the furnace.
摘要:
An activated alumina formed body with a high bulk density and a large macro-pore volume is provided. The activated alumina formed body can be produced by a method comprising the steps of calcining a gibbsite-phase aluminum hydroxide having a median particle size of from about 10 μm to about 35 μm and a packed bulk density of from about 1.05 g/cm3 to about 1.3 g/cm3 to obtain an at least partially rehydratable alumina powder; forming the rehydratable alumina powder in the presence of water; maintaining the formed body in the presence of water to rehydrate the formed body; and calcining the rehydrated formed body to obtain an activated alumina formed body. The activated alumina formed body is usable as an adsorbent, a catalyst supporting precious metal or the like.
摘要翻译:提供了具有高堆积密度和大的大孔体积的活性氧化铝成形体。 活性氧化铝成形体可以通过以下方法制备,该方法包括以下步骤:煅烧中值粒径为约10〜35μm的三水铝矿相氢氧化铝,填充体积密度为约1.05g / cm 2 > 3至约1.3g / cm 3,以获得至少部分可再水化的氧化铝粉末; 在水的存在下形成可再水化的氧化铝粉末; 在水的存在下保持成形体以使成形体再水化; 并煅烧再水化的成形体以获得活性氧化铝成形体。 活性氧化铝成形体可用作吸附剂,负载贵金属的催化剂等。
摘要:
A numerical control apparatus that controls a machine tool including a plurality of linear axes and rotation axes, and controls a relative tool posture with respect to work on a table includes a program reading unit that sequentially reads a tool posture with respect to the work from a machining program, a determining unit that determines whether the read tool posture is within a predetermined tool posture range, a tool-posture control unit that determines control content of the tool posture according to the determination by the determining unit, and an interpolation/acceleration and deceleration processing unit that controls the linear and rotation axes according to the control content of the tool posture. When the read tool posture is within the predetermined range, the tool-posture control unit determines rotation axis angles of the rotation axes such that a change of tool posture from the last tool posture is limited.
摘要:
The invention is to provide a process which can produce a fired body comprising aluminum titanate-based ceramics being excellent in thermal decomposition resistance and having high mechanical strength. The invention is a process for producing an aluminum titanate-based fired body, comprising a step of firing a shaped body of a starting material mixture which contains an aluminum source powder and a titanium source powder, and the aluminum source powder satisfies the following formula (1). In the formula, D90 is a particle diameter corresponding to a cumulative percentage of 90% on a volume basis and D10 is a particle diameter corresponding to a cumulative percentage of 10% on a volume basis, and these are determined from a particle size distribution of the aluminum source powder measured by a laser diffractometry. (D90/D10)1/2≧2 (1)
摘要:
The invention is to provide a process for producing a fired body comprising an aluminum titanate-based ceramic of which the shrinkage ratio in firing (firing shrinkage ratio) can be suppressed low and which is excellent in thermal decomposition resistance. The invention is a process for producing an aluminum titanate-based fired body comprising a step of firing a shaped body of a starting material mixture containing an aluminum source powder, a titanium source powder and a magnesium source powder, wherein the titanium source powder has a specific particle diameter distribution characteristic. In the starting material mixture, the ratio of the Al2O3-equivalent molar amount of the aluminum source powder to the TiO2-equivalent molar ratio of the titanium source powder is preferably within a range of from 35:65 to 45:55, and the ratio of the MgO-equivalent molar amount of the magnesium source powder to the total of the Al2O3-equivalent molar amount of the aluminum source powder and the TiO2-equivalent molar ratio of the titanium source powder is preferably within a range of from 0.03 to 0.15.
摘要翻译:本发明提供一种烧结体的制造方法,其包括可以抑制烧成率(烧成收缩率)低且耐热分解性优异的钛酸铝系陶瓷。 本发明是一种钛酸铝系烧结体的制造方法,其特征在于,包括将含有铝源粉末,钛源粉末和镁源粉末的原料混合物的成形体烧成的工序,其中钛源粉末具有 具体的粒径分布特性。 在原料混合物中,铝源粉末的Al 2 O 3当量摩尔量与钛源粉末的TiO 2当量摩尔比的比优选在35:65〜45:55的范围内, 的镁源粉末的MgO当量摩尔量相对于铝源粉末的Al 2 O 3当量摩尔量和钛源粉末的TiO 2当量摩尔比的合计优选为0.03〜0.15的范围。
摘要:
The invention is to provide a process capable of producing aluminium magnesium titanate having a small coefficient of thermal expansion at a firing temperature lower than 1500° C. The production process of the invention comprises maintaining a pre-mixture containing a titania source powder, an alumina source powder, a magnesia source powder and a silica source powder within a temperature range of from 1100° C. to 1350° C. for at least 3 hours, followed by heating up to a temperature not lower than 1400° C. and firing at the temperature. The silica source powder is preferably a powder of alkali feldspar. Aluminium magnesium titanate is prepared according to the production process of the invention, and the resulting aluminium magnesium titanate is ground to give an aluminium magnesium titanate powder.
摘要:
An inkjet recording apparatus comprising: a conveyance belt for conveying a recording medium; a cleaning roller kept in contact with the conveyance belt to clean the conveyance belt; and a controller for controlling the cleaning roller so as to be able to select between two modes for its driving, wherein the two modes are the mode in which the cleaning roller is driven by the movement of the conveyance belt and the mode in which the cleaning roller is driven independently of the movement of the conveyance belt.
摘要:
In a connector including a contact and a housing holding the contact, a shell is coupled with the housing. The housing has a coupling portion to be coupled with a mating connector in a first direction. The contact has a contacting portion disposed in the coupling portion. The shell includes an opening edge defining an opening faced to the coupling portion and a guide portion disposed in the coupling portion to guide movement of the mating connector in the first direction.