CN101879593A - High-density molybdenum alloy top head and preparation method thereof - Google Patents

Abstract

The invention discloses a high-density molybdenum alloy top head and a preparation method thereof. The molybdenum alloy top head comprises the following raw materials in weight percent: 95.8% of molybdenum, 2% of Ti, 0.2% of Zr, 0.15% of Nb, 0.55% of Cr, 1.1% of V, 0.05% of Ni and 0.15% of C. The preparation method comprises the following steps of: selecting and compounding the raw materials, mixing, pressing into blanks, performing intermediate-frequency high-temperature sintering at 1970 DEG C, and turning for shaping. Compared with the traditional common molybdenum top head, the high-density molybdenum alloy top head has the advantage of high density greater than 9.7 g/cm<3> and 2-6 percent greater than that of the common molybdenum top head. The Vickers hardness can reach more than 350. Because the pressing pressure is more than or equal to 200 MPa during preparation and intermediate-frequency high-temperature sintering at 1970 DEG C is performed, the superficial density and hardness of the molybdenum alloy top head are consistent with the interior density and hardness. Thus, the molybdenum alloy top head has the advantage of high abrasive resistance, and the abrasion hardness can be increased by 60-80%.

Description

High-density molybdenum alloy top head and preparation method thereof

Technical field

The present invention relates to the molybdenum plug field, be specifically related to a kind of high-density molybdenum alloy top head and preparation method thereof.

Background technology

Traditional molybdenum alloy top head adopts the FMo-1 raw material to add rare earth material, is processed into finished product density 〉=9.5g/cm through operations such as batch mixing moulding, sharp processing, high temperature sinterings ³Be mainly used in the perforation work of seamless steel pipes such as stainless steel, steel, bearing steel and high-temperature alloy steel, and the heat of the seamless pipe of unlike material under high-temperature oxidation environment is pricked perforation work.

The patent No. is that the Chinese patent of 200520107984X discloses a kind of " molybdenum plug that the perforation steel pipe is used ", " teat of this molybdenum plug top ends can make ball piece portion directly not contact with red-hot intermetallic; can slow down its wearing and tearing; and all whole contact-making surface that reduces between itself and tube wall of truncated cone-shaped, to improve its service life ".

The patent No. is 2007100547117 Chinese patent, discloses " a kind of forging molybdenum plug and preparation method thereof ".By select materials, cooperation, batch mixing, charging, shaping, compacting, turning shaping, high temperature sintering, add thermal forge-pressing-forming then, turning is proofreaied and correct, and promptly gets described forging molybdenum plug.

Summary of the invention

The object of the present invention is to provide a kind of high-density molybdenum alloy top head and preparation method thereof, finished product is close 〉=9.7g/cm ³

For reaching above-mentioned purpose, the present invention adopts following technical scheme: of the present invention have a raw material that the top molybdenum plug of heavy alloy contains following composition by weight: molybdenum 95.8%, Ti 2%, Zr0.2%, Nb 0.15%, Cr 0.55%, V 1.1%, Ni 0.05%, C 0.15%, its preparation method is: apolegamy raw material, batch mixing, be pressed into blank, 1850-1950 ℃ intermediate frequency high temperature sintering, turning moulding.

A kind of high-density molybdenum alloy top head of the present invention is proofreaied and correct through lathe turning, carries out the check of outward appearance and density, and the result is: averag density is greater than 9.7g/cm ³

The present invention compares with existing common molybdenum plug, has following advantage:

1, the Ni of adding 0.05% in the prescription fully combines with other material, can make averag density of the present invention greater than 9.7g/cm ³, improve 2-6 percentage point than common molybdenum plug.Vickers hardness can reach more than 350.

2, owing in its preparation process, pressing pressure 〉=200MPa, and warp is at 1970 ℃ intermediate frequency high temperature furnace sintering, can make the molybdenum plug top layer consistent with inner density, hardness, therefore, the advantage that the wearability that the present invention has is strong, rub proofness can improve 60-80%.

3, owing to the raising of its hardness and density, strengthen its service life greatly, saved user's production cost.

The specific embodiment

The specific embodiment of the present invention is further specified by following embodiment.

Of the present invention have a raw material that high-density molybdenum alloy top head contains following composition by weight: molybdenum 95.8%, Ti 2%, Zr 0.2%, Nb 0.15%, Cr 0.55%, V 1.1%, Ni 0.05%, C 0.15%, and the preparation method is:

Step 1, apolegamy raw material: the raw material according to following composition by weight is prepared; Fmo-1 standard, granularity are molybdenum powder 95.8%, Ti 2%, Zr 0.2%, Nb 0.15%, Cr0.55%, V 1.1%, Ni 0.05%, the C 0.15% of 2-3 μ m;

Step 2, the raw material of gained in the step 1 was stirred in batch mixer 24 hours, and mix in conjunction with vibratory sieve;

Step 3, with the compound of gained in the step 2, the pressure forming machine of packing into applies 200MPa pressure and is pressed into blank;

Step 4, the compacting blank that obtains in the step 3 is placed intermediate frequency furnace, be warming up to 1970 ℃ gradually, keep reducing to room temperature after 5 hours;

Step 5, the molybdenum plug that obtains in the step 4 is carried out the turning moulding.

Claims (1)

1. high-density molybdenum alloy top head and preparation method thereof, it is characterized in that: described have a raw material that the top molybdenum plug of heavy alloy contains following composition by weight: molybdenum 95.8%, Ti 2%, Zr 0.2%, Nb 0.15%, Cr 0.55%, V 1.1%, Ni 0.05%, C 0.15%, and the preparation method is:

Step 1, apolegamy raw material: the raw material according to following composition by weight is prepared; Fmo-1 standard, granularity are molybdenum powder 95.8%, Ti 2%, Zr 0.2%, Nb 0.15%, Cr0.55%, V 1.1%, Ni 0.05%, the C 0.15% of 2-3 μ m;

Step 2, the raw material of gained in the step 1 was stirred in batch mixer 24 hours, and mix in conjunction with vibratory sieve;

Step 3, with the compound of gained in the step 2, the pressure forming machine of packing into applies 200MPa pressure and is pressed into blank;

Step 4, the compacting blank that obtains in the step 3 is placed intermediate frequency furnace, be warming up to 1970 ℃ gradually, keep reducing to room temperature after 5 hours;

Step 5, the molybdenum plug that obtains in the step 4 is carried out the turning moulding.