Molybdenum-lanthanum alloy sintered blank preparation method and product thereof

Abstract

The invention discloses a preparation method of a molybdenum-lanthanum alloy sintered blank and a product thereof, and the preparation method comprises the following steps: 1) preparation of a mixture: weighing molybdenum powder and LaB6 according to a certain proportion, and then mixing to obtain the uniformly mixed mixture; (2) preparing a blank: pressing the mixed powder in the step (1) according to requirements to obtain the blank; (3) preparing a pure molybdenum sintered product: putting the blank in the step (2) into a sintering furnace; and carrying out sintering molding in a hydrogen atmosphere according to set process parameters to obtain a molybdenum-lanthanum alloy sintered blank. According to the invention, a small amount of LaB6 is added into Mo powder, so that the material mixing process is relatively simple, and large-scale application can be realized. According to the method, hydrogen atmosphere sintering is adopted, the requirement for sintering equipment is not high, meanwhile, the highest sintering temperature is 1600 DEG C, compared with a traditional sintering method with the temperature higher than 1900 DEG C, energy can be effectively saved, pollution can be reduced, and it can be guaranteed that the grain size of molybdenum metal products is not too large through relatively low-temperature sintering.

Description

technical field

[0001] The invention belongs to the technical field of molybdenum metal materials, and in particular relates to a method for preparing a molybdenum-lanthanum alloy sintered billet and a product thereof. Background technique

[0002] Molybdenum metal material is a widely used in aerospace, electronic appliances, machining, military, metallurgy and other fields, such as high melting point, high strength, high creep and corrosion resistance, low thermal expansion coefficient and excellent thermal conductivity Commonly used high-temperature alloys with excellent performance characteristics such as electrical conductivity and electronic conductivity, and with the further development of technology, the requirements for the performance of molybdenum metal materials have also increased.

[0003] Usually, the sintering temperature of molybdenum metal material is above 1900°C. Higher sintering temperature has higher requirements on production equipment and energy consu...

Examples

Embodiment 1

[0025] Weigh 59.4g of two-stage reduced molybdenum powder, weigh LaB 6 Put 0.6g of powder into the mixing bottle together, the speed of the mixer is 120r / min; the ratio of ball to material is 4:1; the total time of mixing is 12h, there is no protective gas, and the grinding balls are zirconia balls.

[0026] Take out the molybdenum powder powder after mixing the materials, put it into the prepared mold, and carry out cold isostatic pressing with a pressing pressure of 150MPa, and the holding time is 120s to obtain a compact;

[0027] Put the compact into the hydrogen sintering furnace, close the hydrogen sintering furnace before sintering and evacuate to a vacuum degree of less than 1.0×10 -2 Pa, wash the gas repeatedly before sintering to ensure the hydrogen sintering atmosphere, check the purity and ignite, then set the sintering program, heating and cooling speed: 0~1000℃, 10℃ / min; 1000~1500℃, 5℃ / min; 1500~ 1600°C, 2°C / min, when cooling down, when the temperature drops to ...

Embodiment 2

[0029] Process parameter is basically consistent with embodiment 1 in all preparation processes, only the LaB that mixes 6 The content becomes 1.5%. It can be seen from the data in Table 1 that at this sintering temperature, the density of the sample reaches 93.1%, the hardness is 224HV, and the tensile strength is 716Mpa.

technical field

[0001] The invention belongs to the technical field of molybdenum metal materials, and in particular relates to a method for preparing a molybdenum-lanthanum alloy sintered billet and a product thereof. Background technique

[0002] Molybdenum metal material is a widely used in aerospace, electronic appliances, machining, military, metallurgy and other fields, such as high melting point, high strength, high creep and corrosion resistance, low thermal expansion coefficient and excellent thermal conductivity Commonly used high-temperature alloys with excellent performance characteristics such as electrical conductivity and electronic conductivity, and with the further development of technology, the requirements for the performance of molybdenum metal materials have also increased.

[0003] Usually, the sintering temperature of molybdenum metal material is above 1900°C. Higher sintering temperature has higher requirements on production equipment and energy consu...

Examples

Embodiment 1

[0025] Weigh 59.4g of two-stage reduced molybdenum powder, weigh LaB 6 Put 0.6g of powder into the mixing bottle together, the speed of the mixer is 120r / min; the ratio of ball to material is 4:1; the total time of mixing is 12h, there is no protective gas, and the grinding balls are zirconia balls.

[0026] Take out the molybdenum powder powder after mixing the materials, put it into the prepared mold, and carry out cold isostatic pressing with a pressing pressure of 150MPa, and the holding time is 120s to obtain a compact;

[0027] Put the compact into the hydrogen sintering furnace, close the hydrogen sintering furnace before sintering and evacuate to a vacuum degree of less than 1.0×10 -2 Pa, wash the gas repeatedly before sintering to ensure the hydrogen sintering atmosphere, check the purity and ignite, then set the sintering program, heating and cooling speed: 0~1000℃, 10℃ / min; 1000~1500℃, 5℃ / min; 1500~ 1600°C, 2°C / min, when cooling down, when the temperature drops to ...

Embodiment 2

[0029] Process parameter is basically consistent with embodiment 1 in all preparation processes, only the LaB that mixes 6 The content becomes 1.5%. It can be seen from the data in Table 1 that at this sintering temperature, the density of the sample reaches 93.1%, the hardness is 224HV, and the tensile strength is 716Mpa.

Images