摘要:
Objects of the present invention are to provide a brazeable aluminum alloy cast material which can be manufactured brazeable products without lowering the productivity and the method of brazing a cast material.The cast material is composed of: 0.5-4.5% by weight of Mn; 0.5-3% by weight of Si; 0.5-1% by weight of Fe; and the balance composed of aluminum and impurities. In the method of brazing the cast material, a brazing agent and/or flux are used, the brazing agent is composed of: 25-65% by weight of Zn; 2-7% by weight of Si; and the balance composed of aluminum and 0.1% or less of Fe as one of impurities. The flux is a mixture of: 0.5-5% by weight of LiF; 1-10% by weight of ZnCl.sub.2 ; 1-5% by weight of K.sub..alpha. AlF.sub..alpha.+3 (.alpha. is an integer not less than 1.); and the balance composed of BaCl.sub.2 -KCl-NaCl.
摘要:
An aluminum alloy for heat exchangers, the alloy, comprising a base compostion selected from a group consisting of Al-Mg-Si composition containing 0.1 to 0.8 wt % of Mg, 0.2 to 1.0 wt % of Si and 0.3 to 1.5 wt % of Mn; pure-Al composition; Al-Mg composition containing 0.05 to 1.0 wt % of Mg; and a Al-Zn composition containing 0.05 to 2.0 wt % of Zn. The alloy further comprises 0.01 to 0.3 wt % of Fe and/or 0.01 to 0.3 wt % of Ni, wherein the balance are aluminum of purity of 99.9% or higher and unavoidable impurities contained therein, and content of Cu as one of the impurities is controlled to be 0.05 wt % or less.
摘要:
An apparatus for treating a molten metal comprises a vertical post, a treating container disposed at one side of the post and having an opening at its upper end for containing the molten metal, a horizontal suspending arm mounted at its base end on the post upwardly and downwardly movably and rotatable in a horizontal plane, a vertical rotary shaft suspended from the arm and having a treating gas channel internally extending therethrough longitudinally, a bubble releasing-dispersing rotor provided at the lower end of the rotary shaft and having in its bottom surface a treating gas outlet in communication with the gas channel, the rotor being movable into and out of the container through the opening, and at least one baffle suspended from the arm and movable into and out of the container through the opening for preventing eddying and waving. When there arises a need to repair or relace the rotary shaft, the rotor and/or the baffle, or when the dross is to be removed from the surface of molten metal after the treatment, the rotor, the shaft and the baffle are brought out of the container by raising the suspending arm and are thereafter brought to a position away from immediately above the container by horizontally moving the arm. The above work is then performed.
摘要:
The disclosure is directed to a method for purifying metals, which can very efficiently and inexpensively eliminate impurity elements included in various metallic or semiconductor materials, or more specifically included in metallurgical grade silicon.
摘要:
A process for brazing a die-cast aluminum material, wherein a die-cast aluminum material produced at a gate speed of 20 m/s or higher is used to be brazed at a brazing temperature of 500.degree. C. or lower. Further, it is preferred that the die-cast aluminum material is produced under a casting pressure of 600 kgf/cm.sup.2 or lower, or that the die-cast aluminum material is produced while depressurizing a mold. Brazing may as well be conducted using a brazing filler metal material composed of 6 to 24 wt. % of Al and the balance consisting of Zn and impurities. In the foregoing manner, the die-cast aluminum material can be brazed by heating it to a high temperature.
摘要翻译:一种用于钎焊压铸铝材料的方法,其中使用以20m / s或更高的闸门速度制造的压铸铝材料在500℃或更低的钎焊温度下钎焊。 此外,优选在600kgf / cm 2以下的铸造压力下制造压铸铝材料,或者在对模具进行减压的同时制造压铸铝材料。 也可以使用由6〜24重量份的钎料构成的钎料,进行钎焊。 Al的百分比,余量由Zn和杂质组成。 以上述方式,压铸铝材料可以通过将其加热到高温进行钎焊。
摘要:
A metal having a high purity is prepared by immersing a hollow rotary cooling member in a molten metal containing eutectic impurities and rotating the cooling member while supplying a cooling fluid to the interior of the cooling member, whereby the high-purity metal is caused to crystallize out on a metal deposition area of the peripheral surface portion of the cooling member present under the surface of the molten metal, the metal deposition area being the peripheral surface of at least a part of the entire portion, present under the melt surface, of the member. When the purified metal is caused to crystallize out by rotating the cooling member, a flow of molten metal having a downward velocity component is produced in the vicinity of an upper part of the entire portion, present under the melt surface, of the cooling member.
摘要:
Crude silicon is purified by melting the crude silicon, maintaining the molten silicon above the solidification temperature thereof in an inert gas atmosphere, and rotating a hollow rotary cooling member as immersed in the molten silicon while introducing a cooling fluid into the cooling member to cause high-purity silicon to crystallize on the outer surface of the cooling member.
摘要:
A first aluminum brazing alloy for cold brazing, comprises 70 to 90% by weight of zinc and 0.05 to 5% by weight of titanium with the balance consisting of aluminum and impurities. A second aluminum brazing alloy for cold brazing, comprises 30 to 70% by weight of zinc, 1 to 7% by weight of silicon, and 0.05 to 5% by weight of titanium with the balance consisting of aluminum and impurities. Brazing alloys having these compositions have a low melting point and can well wet a base metal. Further, use of the above aluminum brazing alloy for cold brazing enables a low-melting aluminum material to be well brazed at 400 to 550° C.
摘要:
A metal purifying apparatus comprises a closed melting furnace equipped with a heater, molten metal holding crucible disposed within the furnace, a vertical hollow rotary shaft penetrating through a top wall of the furnace, a packing sealing off a clearance in the shaft penetrating portion of the top wall around the shaft, rotary drive means for rotatingly driving the shaft, a hollow rotary cooling body fixedly provided at a lower end of the shaft and having an interior space communicating with an interior space of the shaft, and a cooling fluid supply source for supplying a cooling fluid to the interior of the cooling body. The rotary shaft has disposed therein a cooling fluid discharge pipe with a lower end positioned below the top wall of the furnace. An outer periphery of the discahrge pipe and an inner periphery of the shaft are spaced apart from each other and define a space portion providing a cooling fluid supply channel for passing therethrough the cooling fluid to be supplied from the source to the interior space of the cooling body. The discharge pipe has an interior providing a cooling fluid discharge channel for discharging therethrough the cooling fluid supplied to the interior of the cooling body.
摘要:
A heat exchanger comprises tubular elements and fin members. The tubular elements are made of an aluminum alloy containing 0.05 to 1.0 wt % of Mg, 0.2 to 1.2 wt % of Si, 0.2 to 1.5 wt % of Mn, 0.01 to 0.5 wt % of Fe, as necessary components, and further containing at least one of 0.05 to 0.3 wt % of Cr and 0.01 to 0.05 wt % of Ti, as optional auxiliary components, and 0.05 or less wt % of Cu as a controlled impurity, the balance being aluminum and unavoidable impurities. The fin members are made of another aluminum alloy containing 0.05 to 1.0 wt % of Mg, 0.2 to 1.2 wt % of Si, 0.2 to 1.5 wt % of Mn, 0.01 to 0.5 wt % of Fe, and further containing at least one of 0.01 to 0.1 wt % of In and 0.1 to 2.0 wt % of Zn as necessary components, and still further containing at least one or of 0.05 to 0.3 wt % of Cr and 0.01 to 0.05 wt % of Ti as optional auxiliary components, and 0.05 wt % or less of Cu as a controlled impurity, the balance being aluminum and unavoidable impurities.