Method for preparing beryllium-titanium alloy ball through injection molding and beryllium-titanium alloy ball

Abstract

The method comprises the steps that beryllium powder and titanium powder in a preset mass ratio are subjected to ball milling and mixing, and beryllium-titanium mixed powder is obtained; mixing the beryllium-titanium mixed powder and a binder to obtain a feed; the feed is loaded into an injection machine for injection molding, and a first beryllium-titanium alloy ball blank is obtained; performing oxalic acid catalytic degreasing on the first beryllium-titanium alloy ball blank under the protection of inert gas to obtain a second beryllium-titanium alloy ball blank with the residual binder; the second beryllium-titanium alloy ball blank is subjected to three-stage continuous heating sintering, and after sintering is completed, cooling is conducted along with furnace cooling; according to the method, the feed is formed through pre-granulation, the first beryllium-titanium alloy ball blank is formed through injection molding, the second beryllium-titanium alloy ball blank is formed through oxalic acid degreasing, the final beryllium-titanium alloy ball is formed through staged sintering, the diameter of the ball can meet the level larger than 5 mm, and various physical and chemical indexes also meet the requirements of users.

Description

Technical Field

[0001] The present invention relates to the technical field of preparation of advanced nonferrous metal materials and novel aviation titanium alloy materials, and in particular to a method for preparing beryllium-titanium alloy pellets by injection molding and the beryllium-titanium alloy pellets. Background Art

[0002] Metallic beryllium has a low specific gravity, high specific strength, and excellent thermal conductivity. It also has a very low atomic binding energy (1.666 MeV) and a very small neutron absorption cross section. It can easily release neutrons through high-energy particle bombardment, including (n,2n) reactions, thereby achieving neutron multiplication. In nuclear reactors and nuclear weapons, this can greatly save fuel, extend the life of the reactor, and enhance the explosive power of nuclear weapons. However, when beryllium is exposed to a large dose of neutrons, it will produce ① 9 Be(n,2n) 8 He, ② 9 Be(n,a) 6 He, 6 He 6 Li, 6 Li(n,a) 3 Produced by the nuclear reaction of H 8 He and 3 The helium formed gathers at the grain boundaries to form bubbles, causing the volume expansion and deformation of the metal beryllium pellets, the decrease in mechanical strength, and the occurrence of radiation swelling (>3%) and He embrittlement. Studies have found that beryllium-titanium alloy pellets, especially those with high Be content, 12 Ti phase has better resistance to radiation swelling and He embrittlement, making it the preferred neutron multiplication material to replace metallic beryllium pellets.

[0003] Beryllium titanium alloy pellets are usually produced by (1) gas atomization method, in which the molten beryllium titanium alloy is sprayed out through an air flow and cooled in an inert atmosphere to form pellets. The beryllium titanium alloy pellets obtained by this method have poor sphericity, a high proportion of deformed balls, and difficult to control the particle size of the pellets. (2) Plasma rotating electrode method, in which the beryllium titanium mixed powder is pre-pressed by cold isostatic pressing to produce a rod blank. The rod blank is then subjected to hot isostatic pressing or spark plasma sintering to produce a rod material. The rod material is then subjected to electric spark wire cutting and finishing to obtain a beryllium titanium alloy electrode rod. Finally, the electrode rod is used as a consumable rotating electrode, and a plasma arc is generated by close discharge with a tungsten electrode. The end surface of the beryllium titanium alloy electrode melts into liquid and is thrown out under the action of high-speed rotating centrifugal force. It cools and solidifies in the granulation chamber to form beryllium titanium alloy pellets. However, due to the uneven distribution of plasma energy, the particle size of the alloy balls is uneven, and due to the limitation of liquid surface tension, it is difficult to prepare beryllium-titanium alloy balls with a diameter of 5 mm or larger. Summary of the Invention

[0004] In view of the above defects, the present invention proposes a method for preparing beryllium-titanium alloy balls by injection molding, comprising the following steps: Step S1, ball-milling beryllium powder and titanium powder at a preset mass ratio to obtain a beryllium-titanium mixed powder; Step S2, mixing the beryllium titanium mixed powder and a binder to obtain a feed; Step S3, loading the feed material into an injection molding machine for injection molding to obtain a first beryllium-titanium alloy ball blank; Step S4, performing oxalic acid catalytic degreasing on the first beryllium-titanium alloy ball blank under the protection of an inert gas to obtain a second beryllium-titanium alloy ball blank containing residual binder; Step S5, subjecting the second beryllium-titanium alloy ball blank to three stages of continuous temperature rise sintering, and cooling the blank in the furnace after sintering to obtain a beryllium-titanium alloy ball with a diameter of not less than 5 mm; The temperature of the first stage sintering is low temperature sintering, which is lower than 680℃; The temperature of the second stage sintering is medium temperature sintering, which is lower than 780℃; The temperature of the third stage sintering is high temperature sintering, which is lower than 1260°C.

[0005] The present invention employs pre-granulation to form a feedstock, injection molding a first beryllium-titanium alloy pellet, oxalic acid degreasing to form a second beryllium-titanium alloy pellet, and staged sintering to form the final beryllium-titanium alloy pellet. This overcomes the technical issues of the prior art, such as limited pellet size, low pelletization rate, high impurity content, and uncontrollable phase state. The present invention utilizes a molding process different from the prior art, enabling injection molding to achieve a spherical diameter greater than 5 mm, while also meeting various physical and chemical specifications that meet user requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 The following are pictures of feed material after granulation and feed material that has been crushed without granulation. It can be seen that the feed material after granulation is spherical with smooth edges and no sharp corners or edges.

[0007] Figure 2 This is the XRD diagram of the beryllium titanium alloy ball. The phase structure is Be 12 Ti2 phase and Be 17 Ti2. DETAILED DESCRIPTION

[0008] See also Figure 1 、 2 The present invention provides a method for preparing beryllium-titanium alloy balls by injection molding, comprising the following steps: Step S1, ball-milling beryllium powder and titanium powder at a preset mass ratio to obtain a beryllium-titanium mixed powder; Step S2, mixing the beryllium titanium mixed powder and a binder to obtain a feed; Step S3, loading the feed material into an injection molding machine for injection molding to obtain a first beryllium-titanium alloy ball blank; Step S4, performing oxalic acid catalytic degreasing on the first beryllium-titanium alloy ball blank under the protection of an inert gas to obtain a second beryllium-titanium alloy ball blank containing residual binder; Step S5, subjecting the second beryllium-titanium alloy ball blank to three stages of continuous temperature rise sintering, and cooling the blank in the furnace after sintering to obtain a beryllium-titanium alloy ball with a diameter of not less than 5 mm; The sintering temperature in the first stage is 200-540℃, and the holding time is 0.5-5h; The second stage sintering temperature is 550-780℃, and the holding time is 0.5-15h; The sintering temperature in the third stage is 800-1260°C, and the holding time is 1-18h.

[0009] Different from the one-step binder removal in the prior art that pursues rapid, one-time, and complete degreasing, the present invention removes the binder in a staged and controllable manner through a combination of chemical degreasing and thermal degreasing, which can not only remove the binder but also meet the strength and shape requirements of the ball blank.

[0010] The sintering of this embodiment is the key to controlling the size accuracy and density of the final product, the beryllium titanium alloy pellets. The size accuracy, density, and internal structure of the final product, the beryllium titanium alloy pellets, are controlled by a staged sintering process. The sintering is divided into three stages. The sintering temperature of the first two stages is lower than 800°C. Thermal degreasing is mainly used. The purpose is to remove the residual binder after oxalic acid degreasing. Since metallic beryllium will react with carbon to form beryllium carbide at 800-900°C, the sintering temperature of the first two sintering stages (thermal degreasing) is set below 680°C. This temperature is sufficient to decompose the binder and remove it completely. The third stage sintering is densification sintering. Since titanium and beryllium begin to have Be at 800°C, the heat treatment temperature is 200°C. 12 The Ti phase forms, so a longer holding time is required to allow the phase change to fully complete. The third stage of sintering is precisely because the binder is fully removed in the first two stages, ensuring that no beryllium carbide impurities are generated during the third stage of sintering.

[0011] Furthermore, in step S1, the mass ratio of beryllium powder to titanium powder is (60-85): (15-40).

[0012] Furthermore, in step S2, the mass percentage of the binder in the feed is 20-40%, the mixing temperature is 160-195° C., and the mixing time is 1-2 h.

[0013] The binder is one or more of polyoxymethylene, high-density polyethylene, ethylene-vinyl acetate copolymer, stearic acid, polyethylene wax, low-density polyethylene or polyethylene. The mixture of the multiple compositions is configured in a mass ratio of 1-15 while maintaining the total mass. The binder selected in this embodiment has a lower solid-liquid transition temperature, a higher degreasing rate, good surface compatibility with the beryllium titanium metal powder, a lower residual rate and environmental friendliness.

[0014] Furthermore, in step S2, the beryllium-titanium mixed powder and the binder are mixed and granulated to obtain a spherical feed with a particle size of 2-5 mm. This step is to granulate the mixed powder and the binder while mixing and kneading them. Granulation can make the mixed powder and the binder mix evenly and form a spherical shape at the same time. This shape can make the material have smooth edges, no sharp corners and sharp edges in advance. In the subsequent injection molding process, it avoids blockage and material jamming due to the sharp shape during the material injection process, and also affects the smoothness of the injection molding process and the high filling rate of the feed in the mold, which is not conducive to the injection formation of a spherical blank.

[0015] Furthermore, in step S3, the injection molding temperature is 50-200° C., the injection pressure is 100-150 MPa, the mold temperature is 40-150° C., and the injection speed is 10-30 mm / s.

[0016] Furthermore, in step S4, the mass percentage of the residual binder is 5-20%. Mixing the binder with the beryllium-titanium mixed powder can improve the low-temperature fluidity of the powder, facilitating subsequent injection molding. The amount of binder used is extremely critical. If there is too much binder, on the one hand, there will be residue after degreasing, resulting in a high carbon residue in the final product; on the other hand, after oxalic acid degreasing, if too much binder is removed, too little will remain, which will lead to a decrease in the bonding force between the particles of the beryllium titanium mixed powder and a decrease in the agglomeration ability. During sintering, due to the rapid temperature increase, the ball formation rate will decrease, and the size of individual spheres will also decrease; if there is too much binder remaining, the size of the beryllium titanium alloy pellets will shrink significantly after sintering, and the sphere shrinkage rate will be large, which will reduce the accuracy of the size of the beryllium titanium alloy pellets; the beryllium titanium mixed powder after mixing with the binder is in a solid dough state at room temperature. In order to maintain the smoothness of the subsequent injection molding process and the high filling rate of the feed in the mold, the mixed dough needs to be granulated into spherical feed to avoid the problem of sharp edges of the feed causing blockage of the injection molding machine and low feeding filling rate.

[0017] Furthermore, in step S4, the oxalic acid-catalyzed degreasing is carried out at an acid feed rate of 3-10 g / min, an inert gas flow rate of 50-100 sccm, a temperature of 100-180° C., and a time of 1-5 h. Oxalic acid-catalyzed degreasing is a chemical degreasing process in which the acid feed rate, inert carrier gas flow rate, and temperature jointly determine the degreasing rate and the amount of binder remaining after degreasing. Excessive acid feed rate, inert carrier gas flow rate, and temperature result in an excessively fast degreasing rate. Faster surface degreasing results in the formation of microporous channels on the surface after the binder vaporizes and escapes. As the core binder diffuses outward, it inevitably carries over or entrains internal powder particles that diffuse or migrate outward. These migrated powder particles easily clog the surface micropores, closing the external pores of the molding ball blank, thereby blocking the channels for the internal binder to be discharged outward. This prevents the internal binder from being removed and causes hidden cracks in the sphere, ultimately affecting the shape integrity and mechanical strength of the sphere. If the acid feed rate, inert carrier gas flow rate and temperature are too small, the degreasing rate will be too slow, the working hours will be too long, the energy consumption will be high, and it will be detrimental to production.

[0018] This solution controls the oxalic acid degreasing in the intermediate step and reasonably controls the removal rate and content of the binder, so that the ball blank has no internal cracks before sintering and has initial and controllable strength. The relative density can reach more than 80%. This gives the ball blank initial strength during the sintering process, and this strength is achieved simultaneously during the degreasing process. This is different from the existing technology in which a separate preheating or drying process needs to be designed to give the ball blank initial strength before sintering.

[0019] Furthermore, in step S5, the temperature of the first stage sintering is 200-540°C and the holding time is 0.5-5h; The second stage sintering temperature is 550-780℃, and the holding time is 0.5-15h; The sintering temperature in the third stage is 800-1260°C, and the holding time is 1-18h.

[0020] The present invention also provides a beryllium-titanium alloy ball, which contains Be 12 Ti2 phase 10%~70%, impurity content ≤2%, beryllium carbide content less than 0.5%, compressive strength 140~2000N, sphericity ≥95%, size not less than 5mm.

[0021] Furthermore, the beryllium-titanium alloy pellet contains Be 12 Ti2 phase 10%~70%, containing Be 17 Ti2 phase is less than 30%, impurity content ≤2%, compressive strength 140~2000N, sphericity ≥95%, and size not less than 5mm.

[0022] The following examples demonstrate that the technical solution of the present invention is superior to the prior art.

[0023] Option 1 The present invention provides a method for preparing beryllium-titanium alloy pellets by injection molding, comprising the following steps: Step S1, ball-milling beryllium powder and titanium powder in a mass ratio of 60:40 to obtain a beryllium-titanium mixed powder; Step S2: knead the beryllium titanium mixed powder and the binder to obtain a feed with a particle size of 3 mm; the mass percentage of the binder in the feed is 30%, the mixing temperature is 160°C, and the mixing time is 2 hours. Step S3, loading the feed material into an injection molding machine for injection molding to obtain a first beryllium-titanium alloy ball blank; the temperature is 60° C., the injection pressure is 100 MPa, the mold temperature is 50° C., and the injection speed is 10 mm / s.

[0024] Step S4, performing oxalic acid catalytic degreasing on the first beryllium-titanium alloy ball blank under inert gas protection, with an acid feed rate of 8 g / min, an inert gas flow rate of 50 sccm, a temperature of 120° C., and a time of 2 hours to obtain a second beryllium-titanium alloy ball blank with residual binder; Step S5, subjecting the second beryllium-titanium alloy ball blank to three stages of continuous temperature rise sintering, and then cooling the blank in the furnace after sintering to obtain beryllium-titanium alloy small balls of uniform size; The sintering temperature in the first stage is 300°C and the holding time is 1h; The second stage sintering temperature is 550℃ and the holding time is 5h; The sintering temperature in the third stage is 900℃ and the holding time is 10h.

[0025] After the detection step S4, the mass percentage of the residual binder in the second beryllium-titanium alloy ball blank is 5%, and the relative density of the second beryllium-titanium alloy ball blank is 82%. After sintering, the impurity content of the beryllium-titanium alloy ball is 1.5% (wherein the carbide content is not greater than 0.2%), the compressive strength is 1500N, the sphericity is 95%, the size is 5.4mm (the average value after detecting multiple sample balls), and the XRD phase state is as follows: Figure 2 .

[0026] Option 2 The present invention provides a method for preparing beryllium-titanium alloy pellets by injection molding, comprising the following steps: Step S1, ball-milling beryllium powder and titanium powder in a mass ratio of 65:35 to obtain a beryllium-titanium mixed powder; Step S2: knead the beryllium titanium mixed powder and the binder to obtain a feed with a particle size of 4 mm; the mass percentage of the binder in the feed is 20%, the mixing temperature is 175°C, and the mixing time is 1.5 hours. Step S3, loading the feed material into an injection molding machine for injection molding to obtain a first beryllium-titanium alloy ball blank; the temperature is 180° C., the injection pressure is 100 MPa, the mold temperature is 80° C., and the injection speed is 10 mm / s.

[0027] Step S4, performing oxalic acid catalytic degreasing on the first beryllium-titanium alloy ball blank under inert gas protection, with an acid feed rate of 6 g / min, an inert gas flow rate of 60 sccm, a temperature of 130° C., and a time of 2 hours to obtain a second beryllium-titanium alloy ball blank with residual binder; Step S5, subjecting the second beryllium-titanium alloy ball blank to three stages of continuous temperature rise sintering, and then cooling the blank in the furnace after sintering to obtain beryllium-titanium alloy small balls of uniform size; The sintering temperature in the first stage is 350℃ and the holding time is 2h; The second stage sintering temperature is 750℃ and the holding time is 10h; The sintering temperature in the third stage is 1160℃ and the holding time is 8h.

[0028] After the detection step S4, the residual binder mass percentage of the second beryllium-titanium alloy ball blank is 10%, and the relative density of the second beryllium-titanium alloy ball blank is 85%. After sintering, the beryllium-titanium alloy ball has an impurity content of 1.2% (wherein the carbide content is not greater than 0.2%), a compressive strength of 1660N, a sphericity of 96%, a size of 5.5mm (the average value after detecting multiple sample balls), and an XRD phase state as shown in FIG. Figure 2 .

[0029] Option 3 The present invention provides a method for preparing beryllium-titanium alloy pellets by injection molding, comprising the following steps: Step S1, ball-milling beryllium powder and titanium powder in a mass ratio of 85:15 to obtain a beryllium-titanium mixed powder; Step S2: knead the beryllium titanium mixed powder and the binder to obtain a feed with a particle size of 5 mm; the mass percentage of the binder in the feed is 30%, the mixing temperature is 165°C, and the mixing time is 2 hours. Step S3: loading the feed material into an injection molding machine for injection molding to obtain a first beryllium-titanium alloy ball blank; the temperature is 130° C., the injection pressure is 100 MPa, the mold temperature is 110° C., and the injection speed is 10 mm / s.

[0030] Step S4, performing oxalic acid catalytic degreasing on the first beryllium-titanium alloy ball blank under inert gas protection, with an acid feed rate of 10 g / min, an inert gas flow rate of 100 sccm, a temperature of 180° C., and a time of 5 hours to obtain a second beryllium-titanium alloy ball blank with residual binder; Step S5, subjecting the second beryllium-titanium alloy ball blank to three stages of continuous temperature rise sintering, and then cooling the blank in the furnace after sintering to obtain beryllium-titanium alloy small balls of uniform size; The sintering temperature in the first stage is 500°C and the holding time is 5h; The second stage sintering temperature is 750℃ and the holding time is 12h; The sintering temperature in the third stage is 1260℃ and the holding time is 15h.

[0031] After the detection step S4, the mass percentage of the residual binder in the second beryllium-titanium alloy ball blank is 8%, and the relative density of the second beryllium-titanium alloy ball blank is 80%. After sintering, the impurity content of the beryllium-titanium alloy ball is ≤1% (wherein the carbide content is not greater than 0.2%), the compressive strength is 2000N, the sphericity is 95%, the size is 5.2mm (the average value after testing multiple sample balls), and the XRD phase state is as follows: Figure 2 .

[0032] Option 4 The present invention provides a method for preparing beryllium-titanium alloy pellets by injection molding, comprising the following steps: Step S1, ball-milling beryllium powder and titanium powder in a mass ratio of 70:30 to obtain a beryllium-titanium mixed powder; Step S2: knead the beryllium titanium mixed powder and the binder to obtain a feed with a particle size of 2 mm; the mass percentage of the binder in the feed is 35%, the mixing temperature is 195°C, and the mixing time is 1.5 hours. Step S3, loading the feed material into an injection molding machine for injection molding to obtain a first beryllium-titanium alloy ball blank; the temperature is 150° C., the injection pressure is 150 MPa, the mold temperature is 90° C., and the injection speed is 25 mm / s.

[0033] Step S4, performing oxalic acid catalytic degreasing on the first beryllium-titanium alloy ball blank under inert gas protection, with an acid feed rate of 6 g / min, an inert gas flow rate of 80 sccm, a temperature of 150° C., and a time of 4 hours to obtain a second beryllium-titanium alloy ball blank with residual binder; Step S5, subjecting the second beryllium-titanium alloy ball blank to three stages of continuous temperature rise sintering, and then cooling the blank in the furnace after sintering to obtain beryllium-titanium alloy small balls of uniform size; The sintering temperature in the first stage is 200℃ and the holding time is 4h; The second stage sintering temperature is 780℃ and the holding time is 15h; The sintering temperature in the third stage is 1200℃ and the holding time is 18h.

[0034] After the detection step S4, the mass percentage of the residual binder in the second beryllium-titanium alloy ball blank is 13%, and the relative density of the second beryllium-titanium alloy ball blank is 83%. After sintering, the impurity content of the beryllium-titanium alloy ball is ≤0.8% (wherein the carbide content is not greater than 0.2%), the compressive strength is 1980N, the sphericity is 96%, the size is 5.3mm (the average value after testing multiple sample balls), and the XRD phase state is as follows: Figure 2 .

[0035] The present invention performs a process test after step S4, which shows that the second beryllium-titanium alloy ball has initial strength and density after oxalic acid degreasing, and the binder content is controllable, which provides a good foundation for subsequent sintering. The amount of residual binder is also tested to ensure that no beryllium carbide remains after sintering while maintaining the basic strength and shape of the ball during the subsequent sintering process. Although there is still Be in the phase 17 Ti2, but after testing, this mixed phase does not affect the mechanical properties of the product, and the physical and chemical indicators are the same as those containing Be 12 The levels of Ti2 phase are basically the same.

[0036] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of this patent.

Claims

1. A method for preparing beryllium-titanium alloy balls by injection molding, characterized in that The following steps are involved: Step S1, ball-milling beryllium powder and titanium powder at a preset mass ratio to obtain a beryllium-titanium mixed powder; Step S2, mixing the beryllium titanium mixed powder and a binder to obtain a feed; Step S3, loading the feed material into an injection molding machine for injection molding to obtain a first beryllium-titanium alloy ball blank; Step S4, performing oxalic acid catalytic degreasing on the first beryllium-titanium alloy ball blank under the protection of an inert gas to obtain a second beryllium-titanium alloy ball blank containing residual binder; Step S5, subjecting the second beryllium-titanium alloy ball blank to three stages of continuous temperature rise sintering, and then cooling the blank in the furnace after sintering to obtain a beryllium-titanium alloy ball with a diameter of not less than 5 mm; The temperature of the first stage sintering is low temperature sintering, which is lower than 680℃; The temperature of the second stage sintering is medium temperature sintering, which is lower than 780℃; The temperature of the third stage sintering is high temperature sintering, which is lower than 1260°C.

2. A method for preparing beryllium-titanium alloy pellets by injection molding according to claim 1, characterized in that: In step S1, the mass ratio of beryllium powder to titanium powder is (60-85): (15-40).

3. A method for preparing beryllium-titanium alloy pellets by injection molding according to claim 1, characterized in that: In step S2, the mass percentage of the binder in the feed is 20-40%, the mixing temperature is 160-195° C., and the mixing time is 1-2 hours.

4. A method for preparing beryllium-titanium alloy pellets by injection molding according to claim 3, characterized in that: Step S2: mixing the beryllium-titanium mixed powder and the binder, and granulating the mixture to obtain a spherical feed with a particle size of 2-5 mm.

5. A method for preparing beryllium-titanium alloy pellets by injection molding according to claim 1, characterized in that: In step S3, the injection molding temperature is 50-200° C., the injection pressure is 100-150 MPa, the mold temperature is 40-150° C., and the injection speed is 10-30 mm / s.

6. A method for preparing beryllium-titanium alloy pellets by injection molding according to claim 1, characterized in that: In step S4, the mass percentage of the residual binder is 5-20%.

7. A method for preparing beryllium-titanium alloy pellets by injection molding according to claim 6, characterized in that: In step S4, the oxalic acid catalytic degreasing is carried out at an acid feed rate of 3-10 g / min, an inert gas flow rate of 50-100 sccm, a temperature of 100-180° C., and a time of 1-5 h.

8. A method for preparing beryllium-titanium alloy pellets by injection molding according to claim 1, characterized in that: Step S5, the first stage sintering temperature is 200-540°C, and the holding time is 0.5-5h; The second stage sintering temperature is 550-780℃, and the holding time is 0.5-15h; The sintering temperature in the third stage is 800-1260°C, and the holding time is 1-18h.

9. A beryllium-titanium alloy pellet produced by the method for producing a beryllium-titanium alloy pellet by injection molding according to any one of claims 1 to 8, characterized in that: The beryllium-titanium alloy pellet contains Be 12 Ti2 phase 10%~70%, impurity content ≤2%, carbide content not more than 0.2%, compressive strength 140~2000N, sphericity ≥95%, size not less than 5mm.

10. A beryllium-titanium alloy pellet produced by the method for producing a beryllium-titanium alloy pellet by injection molding according to claim 1, characterized in that: The beryllium-titanium alloy pellet contains Be 12 Ti2 phase 10%~70%, containing Be 17 Ti2 phase is less than 30%, impurity content ≤2%, carbide content is not more than 0.2%, compressive strength is 140~2000N, sphericity is ≥95%, and size is not less than 5mm.

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