JPS6282643A - Brittleness resistant molybdenum wire and manufacture of thesame - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a brittle-resistant molybdenum wire, particularly a molybdenum wire that has excellent cold bending workability and high temperature brittleness, and a method for producing the same.

(Conventional technology) Conventional 2 For example, under the Rodan lamp as shown in Figure 2. 2, an exhaust port 12 is provided in one part of the quartz tube 11.

]: A tungsten filament 14 is arranged inside the tube 10 whose opening part is pinch-sealed 13, and this filament 14 is supported by an upper support 15 and a lower support 16.
And this support 15°16 goes all the way through blip 17,
Internal lead 18 integrated with this support 15°16. l'
It is spot welded to one end of the molybdenum oil 20, 21 through the l.

Then, connect the tube 1 to the other end of the molybdenum oil 20 and 21.
External leads 22 and 23 extending outward are spot welded. A filament support 24 is fully supported at one end by the blip 17.

(Problems to be Solved by the Invention) The above halogen lamp has an upper support 15°, a lower support 16, and internal leads 18, 19. , the outer leads 22, 23, etc. are generally made of molybdenum material, and in particular, the upper support 15 and the inner lead 18, and the lower support 16 and the inner lead 19, which are integrally formed, are made of molybdenum material. 15 and 16 are bent at approximately right angles, and the internal leads 18 and 19 are spot welded to the molybdenum oil wheels 20 and 21, respectively, so that the workability withstands high-speed cold working and the recrystallization of molybdenum during spot welding. A molybdenum material that is resistant to high temperature brittleness and can withstand heating at a much higher temperature is required.

However, the existing molybdenum materials with excellent cold workability are pure molybdenum (purity 99.9).
51 or higher) is known, which has a high elongation rate and satisfies cold workability, but has poor high temperature embrittlement resistance and causes spot welds to become extremely brittle.

On the other hand, solid molybdenum materials with excellent high-temperature brittleness resistance are
t-Si-Mo, Ti-Zi-Mo,
Ti-Mo and W-Mo alloys are known, and although these alloys eliminate the embrittlement of the weld after spot welding, these alloys have poor cold workability and cannot be used with existing molybdenum materials. However, it was not possible to fully satisfy both cold workability and high temperature brittleness resistance.

For this reason, like support for halogen lamps.

When used in parts that undergo high-temperature processing such as cold working and welding, cold processing distortion or embrittlement at room temperature after welding may cause vibrations during handling in subsequent processes, transportation of finished products, or mounting. As a result, it was not possible to obtain a product that was satisfactory in terms of quality assurance and economics.

(Objective of the Invention) The object of the present invention is to obtain a molybdenum material having excellent cold workability (high elongation) and excellent resistance to high-temperature brittleness.

(Structure of the Invention) The present invention provides molybdenum oxide powder with calcium or magnesium or both in a weight ratio of 0.0030 to 0.
After compression molding with 1~3 tons/cm2 of metal powder added by 8000% wet method, 1750~
The sintered body was molded in a hydrogen atmosphere at 1850°C for 6 to 10 hours and hot worked at 11600°C to 1200°C.

Warm processing at 1000-500℃ to achieve final processing rate of 90%
As described above, a molybdenum wire excellent in both cold workability and high temperature brittleness resistance can be obtained.

(Example) Sample number 1 was added to molybdenum oxide powder as shown in Table 1.
Approximately equal amounts of calcium and magnesinium were added in the proportions shown in 6 to 6 using a wet method.

It was made into metal powder using a powder metallurgy method.

This metal powder was compression molded at 1 to 3 tons/rn2, and then sintered in a hydrogen atmosphere at 1750 to 1850°C for 6 to 10 hours to obtain a sintered body.

Hot processing (rolling) on this sintered body at 1600-1200℃
A molybdenum wire with a final processing rate of 90% or more was created by warm processing (wire drawing) at 1000-500℃.This molybdenum wire was spot welded with molybdenum oil in an argon gas atmosphere. , as shown in Table 1, the total amount (sum) of calcium and magnesium content is less than 0.0030 cents and 0.
．． 8000z? - embrittlement will occur if it exceeds 1 cent.
0.0030-4'-cent or more o, so o
No embrittlement occurred below 0.

In the following days, the present inventors discovered that when all magnesium was added to molybdenum oxide powder in the proportions shown in sample numbers 7 to 12 as shown in Table 2, and in sample number 13 as shown in Table 3.
In the case where calcium was added at the ratio shown in ~18, a molybdenum wire was entirely prepared using the same processing method as the sample shown in Table 1, and spot welding was performed under the same conditions.

In these cases as well, as shown in Tables 2 and 3, the content of magnesium or calcium is 0. OO
Brittleness occurred when lr was less than 30 percent and exceeded 0.8000 percent, but no brittleness occurred when it was 0.0030/f-cent or more and less than 0.5ooo.

This is due to the fact that when the content of calcium or magnesium or both exceeds o, so o o, grain boundary impurities due to the r-pagent increase, suppressing grain growth and causing grain boundary cracking during spot welding. conversely (if it is less than 0,0030), the effect of strengthening the grain boundaries by the Dawg agent disappears,
This is thought to be due to grain boundary cracking occurring during spot welding due to coarse grain growth.

Furthermore, in order to judge the cold workability of the molybdenum wire of the present invention, the component shown in Sample 4 in Table 1 was 0.15% calcium.
00 Bircent, Magnesium 0, 4000 /#
- When we measured the elongation rate and tensile stress (TS) of a molybdenum wire with a diameter of 0.3 cents, as shown in Figure 1, it was found that pure molybdenum wire, which was conventionally considered to have excellent cold workability, Good results were obtained by comparison.

(Effects of the Invention) According to the present invention, it is possible to obtain a molybdenum wire that is excellent in both cold workability and high temperature brittleness resistance. By using it as a member that undergoes both processing (processing), it is possible to improve the quality and life of the product.

[Brief explanation of drawings]

FIG. 1 is a temperature-elongation and tensile stress diagram, and FIG. 2 is a schematic diagram of a halogen lamp. 7. ,-n agent (7783) patent attorney) Noriyasu Yata:,-'
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Claims (1)

[Scope of Claims] 1) Brittle-resistant molybdenum wire containing calcium or magnesium or both at a weight ratio of 0.0030 to 0.8000%. 2) Molybdenum oxide powder and calcium or magnesium or both at a weight ratio of 0.0030 to 0.8
1,000% metal powder added by wet method
After compression molding at ~3ton/cm^2, 1750~1
The sintered body was sintered in a hydrogen atmosphere at 850°C for 6 to 10 hours, and then hot worked at 1600 to 1200°C to obtain a
A method for producing a brittle molybdenum wire by warm working at a temperature of 90°C and achieving a final working rate of 90% or more.