A kind of preparation method of tzm alloy material

A technology of alloy material and alloy powder, which is applied in the field of TZM alloy material preparation to achieve uniform chemical composition, reduce the loss of carbon elements, and reduce the effect of oxygen content

Active Publication Date: 2015-07-29
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there have been many studies on the preparation methods of TZM alloys, most of which are limited to using titanium hydride and zirconium hydride as additives. There is no report on the preparation of TZM alloys using titanium carbide and zirconium carbide as additives.

Method used

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  • A kind of preparation method of tzm alloy material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: 3000g of molybdenum powder with a Fisher's particle size of 3.5 μm, 21.26 g of titanium carbide powder with a Fisher's particle size of 2.0 μm, 4.2 g of zirconium carbide powder with a Fisher's particle size of 2.0 μm and -325 mesh carbon powder 0.31 g in Mix evenly in a three-dimensional mixer to obtain alloy powder, and the mixing time is 8 hours;

[0026] Step 2, molding and pressing the alloy powder described in step 1 to obtain three 1kg compacts; the pressing pressure is 300MPa, and the holding time is 1min;

[0027] Step 3. Place the compact described in step 2 in a sintering furnace, first heat the sintering furnace under vacuum conditions, and when the temperature in the furnace rises to 1850°C, keep it warm for 3 hours, and the heating time is 16 hours, and then heat it to the sintering furnace Introduce hydrogen with a flow rate of 60L / h, continue to heat up to 1960°C, heat-preserve and sinter for 5h, and heat up for 1h, and cool down with the furnace...

Embodiment 2

[0030] Step 1, 3000g of molybdenum powder with a Fisher's particle size of 2.0 μm, 15.5 g of titanium carbide powder with a Fisher's particle size of 3.0 μm, 3.81 g of zirconium hydride powder with a Fisher's particle size of 5.0 μm and 0.61 g of -325 mesh carbon powder are placed in the Mix evenly in a three-dimensional mixer to obtain alloy powder, and the mixing time is 24 hours;

[0031] Step 2, molding and pressing the alloy powder described in step 1 to obtain three 1kg compacts; the pressing pressure is 350MPa, and the holding time is 0.7min;

[0032] Step 3. Place the compact described in step 2 in a sintering furnace, first heat the sintering furnace under vacuum conditions, and when the temperature in the furnace rises to 1700°C, keep it warm for 4 hours, and the heating time is 15 hours, and then heat it to the sintering furnace Introduce hydrogen with a flow rate of 70L / h, continue to heat up to 1950°C, heat-preserve and sinter for 6h, and heat up for 2h, and cool ...

Embodiment 3

[0034] Step 1: 3000g of molybdenum powder with a Fisher’s particle size of 5.0 μm, 19.8 g of titanium carbide powder with a Fisher’s particle size of 5.0 μm, 2.1 g of zirconium carbide powder with a Fisher’s particle size of 5.0 μm, and zirconium hydride with a Fisher’s particle size of 3.0 μm Put 1.8g of powder and 0.31g of -325 mesh carbon powder into a three-dimensional mixer and mix evenly to obtain alloy powder. The mixing time is 10h;

[0035] Step 2, molding and pressing the alloy powder described in step 1 to obtain three 1kg compacts; the pressing pressure is 450MPa, and the holding time is 0.1min;

[0036] Step 3. Place the compact described in step 2 in a sintering furnace, first heat the sintering furnace under vacuum conditions, and when the temperature in the furnace rises to 1500°C, keep it warm for 5 hours, and the heating time is 15 hours, and then heat it to the sintering furnace Introduce hydrogen gas with a flow rate of 80L / h, continue to heat up to 1980°C,...

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Abstract

The invention discloses a preparation method of a TZM alloy material, which comprises following steps: 1. putting molybdenum powder, additive powder, auxiliary additive powder and carbon powder in a blender mixer for uniform mixing to obtain alloy powder; 2. fabricating the alloy powder into a compact; 3. putting the compact into a sintering furnace, heating the sintering furnace under a vacuum condition, conducting heat preservation for 3-5 h when the temperature in the furnace is heated to 1,500 DEG C to 1,850 DEG C, inletting hydrogen into the sintering furnace, increasing the temperature continuously to 1,950 DEG C to 2,200 DEG C, conducting insulated sintering for 5-10 h and then obtaining the TZM alloy material through furnace cooling. In the invention, a carbide strengthening phase is directly added in the alloy powder to decrease losses of carbon elements in the alloy sintering. Meanwhile, the invention adopt a method of combining the vacuum sintering with the hydrogen sintering to control the change tendency of alloy elements during the alloy sintering, further realizing the reduction of oxygen content which can be controlled under 250 ppm.

Description

technical field [0001] The invention belongs to the technical field of TZM alloy material preparation, and in particular relates to a preparation method of TZM alloy material. Background technique [0002] Molybdenum is a rare metal of strategic significance, with high melting point, good electrical and thermal conductivity, low expansion coefficient, excellent thermal shock resistance and thermal fatigue resistance, and is widely used as a high-temperature material. However, the disadvantages of pure molybdenum, such as low recrystallization temperature, high brittleness and low room temperature strength, limit its application. [0003] TZM alloy overcomes the shortcomings of pure molybdenum, has a high recrystallization temperature and good high temperature strength, high temperature creep and high temperature durability, so it has been widely used in high temperature fields. In the military industry, TZM alloys are used as valve bodies, rocket nozzles, gas pipes, and noz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10C22C27/04
Inventor 付静波杨秦莉庄飞张晓
Owner JINDUICHENG MOLYBDENUM CO LTD
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