Molten metal supply device and aluminum titanate ceramic member having improved non-wettability

Inactive Publication Date: 2005-02-17
JAPAN FINE CERAMICS CENT +4
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

According to this method, a highly precise cast metal object can be easily obtained.
In addition, another aspect of the present invention provides, a measuring device for a molten metal supply device that uses an electromagnetic pump having: a rotary vane that is provided in a molten metal transport conduit and which is rotated in accordance with the movement of molten metal; and a detector that detects the rotational frequency of the rotary vane. In this measuring device, it is further preferred that a means of detecting the amount of molten metal inside the transport conduit be provided in the transport conduit. According to this device, the amount of molten metal transported can be measured with a high degree of accuracy.
In addition, the present inventors have studied the decrease in the non-wettability of aluminum titanate ceramic wi

Problems solved by technology

However, since an electromagnetic pump confers a thrust to the molten metal, which is a fluid, it is difficult to accurately control the transfer volume thereof by means of current control.
Even when a discharge cylinder is provided for supplying a molten metal to the cavity, the molten metal supply accuracy of the electromagnetic pump ultimately becomes a problem.
However, aluminum titanate ceramic only appears to possess low thermal resistance because of cracks that appear at its grain boundaries.
Thus, the fact that the mec

Method used

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  • Molten metal supply device and aluminum titanate ceramic member having improved non-wettability
  • Molten metal supply device and aluminum titanate ceramic member having improved non-wettability
  • Molten metal supply device and aluminum titanate ceramic member having improved non-wettability

Examples

Experimental program
Comparison scheme
Effect test

Example

Embodiment 1: Production of the Aluminum Titanate Ceramic

The aluminum titanate (Al2TiO5) base powder that was used was Marusu Yuuyaku's TA-2 (containing 5 wt % SiO2) . Water and an alumina ball were added to the base powder, the weight ratio of raw material : alumina ball : water was adjusted to 1:1:0.7, and this mixture was mixed in a ball mill for 63 hours. After that, the Al2TiO5 slurry was passed through a sieve (200 mesh), and water was extracted therefrom with a filter press to obtain an Al2TiO5 press cake.

To this press cake were added suitable amounts of water, a deflocculating agent (manufactured by Chukyo Yushi, product name: D-305), a binder (manufactured by Chukyo Yushi, product name: WE-518), and the slurry density was adjusted to 2.1 to 2.3 g / cm3.

After this, this slurry was poured into a plaster mold, and after it was cast, it was dried at room temperature to obtain a green compact. Two types of green compact were produced, the ladle shape shown in FIG. 13 and th...

Example

Embodiment 2: Forming the Al2O3 Layer and the MgAl2O4 Layer

The Al2TiO5 ceramic sintered compacts obtained (a total of three types) were dip-coated in Aluminasol (manufactured by Nissan Chemical, product name: Aluminasol 200 or Aluminasol 520), and then dried at room temperature. After that, an α-Al2O3 layer having a thickness of 5 μm was formed over the entire surface of each Al2TiO5 ceramic sintered compact by baking each at 1100° C. for one hour in the presence of air.

After that, each compact was immersed for one hour in a molten aluminum alloy (A4C: composition shown in Table 1), 700° C.) that contains a trace amount of Mg (0.5 wt %). In this way, the α-Al2O3 layer on the surface of the Al2TiO5 ceramic reacts with the Mg in the molten A4C, and a monophase MgAl2O4 layer is formed on the surface of the Al2TiO5 ceramic. The thickness of the MgAl2O4 layer is the same as the 5-μm thickness of the α-Al2O3 layer before being immersed in the molten A4C.

Note that the presence of α-...

Example

Embodiment 3: Evaluation of Non-wettability

(1) Wetting Angle

The wetting angle is measured in order to evaluate the non-wettability of the Al2TiO5 ceramic sintered compact with respect to the molten aluminum alloy (A4C).

The following three types of Al2TiO5 ceramic test pieces were used. In other words, i) a test piece in which the surface of the sintered compact produced in Embodiment 1 was cut into a 25 mm×25 mm×6 mm piece, surface-finished to 25 mm×25 mm (thickness of 5 mm) by means of a #800 diamond grindstone, and had a surface roughness (center line average roughness) of approximately 3 μm; ii) a test piece with the same surface finish, on whose surface an α-Al2O3 layer having a thickness of 5 μm was formed according to Embodiment 2; and iii) a test piece obtained by immersing an Al2TiO5 ceramic sintered body on which an α-Al2O3 layer had been formed in a molten aluminum alloy (A4C, 720 degrees C.) for 50 hours in order to change the surface of the α-Al2O3 layer to an MgA...

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Abstract

An electromagnetic type molten metal supply device having superior accuracy in supplying molten metal. This device is comprised of a rotary vane that rotates in accordance with the movement of molten metal inside a molten metal transport conduit, and the amount of molten metal being transported can be measured by detecting the rotational frequency of the rotary vane.

Description

BACK GROUND OF THE INVENTION 1. Field of the Invention This invention relates to a molten metal supply device that transports / supplies molten metallic aluminum and molten metallic sodium, for example. In addition, this invention relates to a technology for conferring and retaining the non-wettability of a ceramic member that comes into contact with a molten metal such as a molten aluminum alloy. 2. Description of the Related Art For example, a linear induction electromagnetic pump that confers a thrust to a molten metal by means of the electromagnetic induction effect is used to transport molten metals such as molten metallic sodium in a fast breeder reactor or molten metallic aluminum in a casting facility. In a molten metal supply device, in particular a molten metal supply device in a casting facility, it is important to supply a predetermined amount of molten metal to the cavity used for casting, in order to achieve casting accuracy. A molten metal supply device having an ...

Claims

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Application Information

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IPC IPC(8): B22D35/00B22D37/00B22D39/00C04B35/443C04B35/478C04B41/50C04B41/87G01F1/06
CPCB22D35/00B22D37/00G01F1/06C04B2235/9676C04B2235/94C04B2235/72C04B2235/401C04B2235/3418C04B2235/3272C04B2235/3217C04B2235/3206B22D39/006C04B35/443C04B35/478C04B41/009C04B41/5029C04B41/5031C04B41/5046C04B41/87C04B2111/00879C04B2111/1056C04B41/4537C04B41/4535C04B41/4523C04B41/4558C04B35/462
Inventor KITAOKA, SATOSHIKASHIWAGI, KAZUMINANJO, FUSAYUKIKAWAMOTO, HIROSHINODA, KATSUTOSHIKIMURA, MASANEKIMURA, MASAHARUKAWASAKI, YUJISUZUKI, ITSUOSUZUKI, SADAHIKOKUME, TOSHIO
Owner JAPAN FINE CERAMICS CENT
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