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Low-melting-point molten metal processing member

A technology for molten metal and processing parts, applied in the field of low melting point molten metal processing parts, can solve problems such as cracks in the intermetallic compound layer, and achieve the effect of excellent melting loss resistance

Inactive Publication Date: 2017-05-10
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the thermal expansion coefficient of these intermetallic compounds is about 1.5 times larger than that of titanium as the base material, so repeated thermal expansion and contraction during use will cause cracks in the intermetallic compound layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Table 1 shows the component composition (mass %) of the base material titanium, the 0.2% proof force (MPa) at 500° C., and the elongation (%) during the tensile test at room temperature. These base titanium are hot-forged and hot-rolled ingots with a specific composition produced by vacuum arc melting, followed by annealing at 750°C for 30 minutes, and then processed into 40mm×40mm plates, and the surface is treated with #600 Made by fine grinding.

[0081] The test pieces obtained from the base material titanium shown in Table 1, subjected to the heat treatment shown in Table 2, and further coated with the coating agent shown in Table 3 were subjected to the exposure test A described later to evaluate the resistance to melting loss. sex.

[0082] [Exposure Test A]

[0083] The test piece was immersed in molten aluminum for 8 hours, then pulled up to the atmosphere after immersion, and the above-mentioned process was regarded as one cycle, and three cycles were implem...

Embodiment 2

[0106] Next, the results of the following exposure test B, that is, the presence or absence of a reaction layer with "solder" and cracks are shown in Table 5.

[0107] [Exposure Test B]

[0108] The test piece was immersed in molten Sn-Pd-based solder (60%Sn-40%Pd) for 8 hours, pulled up into the atmosphere after immersion, and the above-mentioned process was regarded as one cycle, and 6 cycles were implemented. The temperature of the molten solder was set at about 200°C.

[0109] The surface section of the test piece subjected to the exposure test B was embedded in a resin observation table, polished and etched to prepare an observation sample. The length of about 10 mm of the observation sample was observed with an optical microscope, and the thickness (maximum) of the reaction layer formed by the reaction with "solder" and the presence or absence of cracks were evaluated in order to grasp the degree of erosion resistance.

[0110] In Invention Example Nos. 102, 105, and 1...

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Abstract

To improve the erosion resistance of a processing member for low-melting-point molten metals such as aluminum having a low melting point by suppressing the occurrence of cracks in a surface protective layer or separation of a coating layer. Provided is a low-melting-point molten metal processing member which comprises: a base that is formed of titanium; an titanium oxide layer that is arranged on the surface of the base and has a thickness of 2-20 um; and an oxygen enriched layer that is formed of an alpha phase having a higher oxygen concentration than the base and is arranged below the titanium oxide layer, while having a thickness of 20-200 um. This low-melting-point molten metal processing member exhibits excellent erosion resistance against low-melting-point molten metals such as aluminum having a low melting point.

Description

technical field [0001] The present invention relates to a low-melting-point molten metal processing member excellent in erosion resistance to molten metals of low-melting point aluminum, lead, tin, and alloys thereof. In particular, it relates to a processing member having excellent erosion resistance against molten aluminum and its alloys (hereinafter also simply referred to as "aluminum"). Background technique [0002] Casting of aluminum etc. draws molten low-melting point metal and transports it to molds, ladles of die-casting machines, and processing components such as slag removal to remove "slag" floating on the surface of molten metal pools are repeatedly immersed in molten metal. In addition, processing parts such as protective temperature measuring equipment are used in a state of being immersed in molten metal directly. [0003] In such a treatment member that handles or processes low-melting-point molten metal, various heat-resistant coating agents are applied t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/10B22D41/02C22C14/00C22F1/18C23C26/00C23C28/04C22F1/00
CPCB22D41/02C22C14/00C22F1/00C22F1/18C23C8/10C23C26/00C23C28/04C22F1/183
Inventor 高桥一浩川上哲藤井秀树斋藤清隆
Owner NIPPON STEEL CORP
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