JPS5855538A - Filtering member for metal melt - Google Patents

Abstract

PURPOSE:To obtain the titled filtering member which can completely remove oxides, slag, etc. in metal melt, by coating carbon fibers having excellent heat resistance with a metal in a plating, depositing or spraying method to improve the cleanability of the metal melt. CONSTITUTION:The woven or non-woven fabric of carbon fibers is coated with a metal, e.g. Ni or Cu, or these alloy by a plating, depositing or spraying method, and used as a filtering member for the melt of a metal, e.g. Sn, Pb, Zn, Al or Cu, or these alloy. Said filtering member easily removes oxides and slag in the melt to purify it without the formation of hot-melt damage.

Description

DETAILED DESCRIPTION OF THE INVENTION Today, metals such as Sn, PB%Zn, AI and Cu are often used. However, inorganic materials such as glass have poor wettability with molten metals (hereinafter including alloys), and unless they are relatively porous, it is difficult to filter the molten metal. On the other hand, a wire mesh made of metal such as stainless steel has good wettability, but a portion of the wire mesh may be eroded and the material may be contaminated.

The present invention has been made in view of the above circumstances.

That is, carbon fibers with excellent heat resistance and conductivity are coated with metals such as Ni1Cu or their alloys by coating, vapor deposition, or thermal spraying to improve the wettability of molten metal and eliminate oxides and oxides in the molten metal. It was developed for the purpose of completely removing all slag.

This will be explained below using examples.

Example: Commercially available carbon fiber woven fabric (thickness: 0.25 urn,
(approx. 60 mesh), non-woven fabric (thickness: 3n, approximately 60-80
Cu and Ni%N1-P are plated, vapor-deposited or thermal sprayed to a thickness of 2 to 5 microns each on the mesh (mesh), and then Sn, Sn-based white metal (WJ2), Zn-based alloy (ZDCI), AI%Al-based Alloy (ADC12)
, when molten metal of Cu and Cu-based alloy (AIBC2) is filtered, foamed glass (thickness 50 mm, approximately 12 to 20 meshes) and stainless steel Gold'W (60 meshes)
was used to compare the cleanliness of molten metal when the same metal as above was filtered.

Since it is difficult to judge the quality of cleanliness based on the molten metal that passed through it, in this test we observed the size of the oxides and slag deposited on the filter material, as well as the damage state of the filter material, to determine its quality.

The test results are shown in the table below.

As mentioned above, carbon fibers are made of Cu, Ni, Cu-P.
The filtration material that has been removed is foamed glass or stainless steel.
It was found to be significantly superior to "all-steel ropes."

That is, carbon fiber plated with metal has Sn, Z
When the molten metals of n1Al, Cu, and their alloys were filtered, the cleanliness was particularly good, while the vapor-deposited ones were also good. However, although the thermally sprayed woven fabric was much better, the non-woven fabric was unable to filter the molten metal. On the other hand, foamed glass had good filtration of AI, but in the case of ADC12, it did not have much fragrance, and both were partially melted and damaged when the amount of filtration was large. The same thing happened when a helmet or glass wool was used, and when AIBC2ADC12 was filtered, it was easily dissolved and a round A was found.

As described above, it has been found that the metal-coated carbon fiber woven or non-woven fabric of the present invention can easily remove oxides, slag, etc. from molten metals of various metals.

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Claims (1)

[Claims] Plating or vapor deposition on carbon fiber (V) involves coating metal with a thermal spraying method and using this as a filter material for molten metal.