Titanium-based composite double-layered shaped charge and preparation method thereof

Abstract

The application discloses a titanium-based composite double-layer shaped charge liner and a preparation method thereof. The titanium-based composite double-layer shaped charge liner comprises an inner layer and an outer layer arranged outside the inner layer. The inner layer is a titanium-based alloy, and the outer layer is a titanium-based composite material. The titanium-based composite material comprises a ceramic reinforcing phase and a titanium-based alloy. The ceramic reinforcing phase is one or more of TiB, TiC, Ti5Si3, WC, SiC and ZrB. The titanium-based alloy comprises the following components in parts by weight: 5-20% of Al, 10-40% of Nb, 0.5-5% of RE, and the balance of Ti. The RE is one or more of La, Ce, Pr, Nd, Er, Yb and Dy. The preparation method comprises the following steps: mixing raw materials, one-time cold pressing, two-time cold pressing, sintering and mechanical processing. Compared with the prior art, the shaped charge liner can realize large-size opening and high-penetration damage effect on hard targets such as rocks and concrete.

Description

Technical Field

[0001] This invention relates to the field of drug-formed liner, specifically to a titanium-based composite material double-layer drug-formed liner and its preparation method. Background Technology

[0002] In mining and oil extraction, shaped charge perforation technology is crucial, and the shaped charge liner is a core component in the formation of the shaped charge jet; its structure and materials directly determine the perforation effect. Currently, the widely used copper shaped charge liner lacks sufficient penetration depth and hole size for targets such as rock, severely limiting mining efficiency. Furthermore, for efficient blasting demolition of reinforced concrete structures such as bridges, large-sized holes in the concrete are required, which existing shaped charge liner cannot meet. To simultaneously achieve high penetration depth and large hole size, researchers have conducted studies on copper-aluminum double-layer shaped charge liners. However, the significant differences in properties between different materials lead to poor interfacial bonding, limiting the release of the shaped charge liner's destructive performance.

[0003] Studies have shown that titanium alloy liners can achieve larger perforations at the same penetration depth compared to copper liners. Titanium-based composites possess higher modulus and superior high-temperature strength and creep resistance than titanium alloys, making them promising materials for liner applications. The high modulus results in high sound velocity, leading to a higher jet velocity from the liner and thus carrying more energy, which is beneficial for perforation depth. Simultaneously, the excellent high-temperature strength makes the jet less compressible, resulting in a coarser jet, which is conducive to obtaining large-diameter openings. However, the insufficient plasticity of titanium-based composites leads to poor jet formation delay, which is detrimental to head jet opening.

[0004] To address the challenges in fabricating and processing irregularly shaped / complex components for the engineering application of titanium-based composite materials, near-net-shape preparation using powder metallurgy is an effective method. Cost and efficiency are key considerations in engineering applications. Using various low-cost elemental powders as raw materials, near-net-shape forming via cold isostatic pressing and high-temperature sintering can efficiently and cost-effectively produce near-net-shape titanium-based composite double-layer shaped charges. Among these methods, atmospheric pressure sintering is the most economical sintering process for engineering applications; however, it currently suffers from insufficient sintering density, resulting in poor mechanical properties that fail to meet application requirements. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a titanium-based composite material double-layer shaped charge liner that meets the requirements of large-size openings and high penetration depth damage effects, in light of the above-mentioned technical status.

[0006] The second technical problem to be solved by the present invention is to provide a low-cost, short-process, near-net-shape powder metallurgy method for preparing a titanium-based composite material double-layer shaped charge liner, in light of the above-mentioned technical status.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a titanium-based composite material double-layer shaped charge liner, characterized in that: the shaped charge liner includes an inner layer and an outer layer disposed outside the inner layer, the inner layer is a titanium-based alloy, the outer layer is a titanium-based composite material, and the titanium-based composite material includes a ceramic reinforcing phase and a titanium-based alloy;

[0008] The ceramic reinforcing phase is one or more of TiB, TiC, Ti5Si3, WC, SiC, and ZrB. The titanium-based alloy comprises the following components by weight percentage: 5-20% Al, 10-40% Nb, 0.5-5% RE, with the balance being Ti; wherein RE is one or more of La, Ce, Pr, Nd, Er, Yb, and Dy.

[0009] Preferably, the titanium-based composite material comprises: 1 to 20 vol.% ceramic reinforcing phase, with the balance being a titanium-based alloy.

[0010] Preferably, it includes the following steps:

[0011] ① Mixing raw materials: Raw material A is ball-milled and mixed evenly to obtain powder A; raw material B is ball-milled and mixed evenly to obtain powder B; raw material A includes sponge titanium powder, titanium hydride powder, aluminum-niobium alloy powder, niobium powder, aluminum rare earth alloy powder, titanium diboride powder, silicon powder, and raw material C, wherein raw material C is one or more of boron carbide powder, zirconium diboride powder, silicon carbide powder, and tungsten carbide powder; raw material B includes sponge titanium powder, titanium hydride powder, aluminum-niobium alloy powder, niobium powder, and aluminum rare earth alloy powder;

[0012] ②One-time cold pressing: Powder B is placed in the first mold and cold isostatically pressed to obtain the first compact;

[0013] ③ Secondary cold pressing: The first blank is placed into the second mold, then powder A is added, and the second blank is obtained after cold isostatic pressing.

[0014] ④ Sintering: The second pressed blank is sintered and then cooled to obtain a blank;

[0015] ⑤ Machining: After machining the blank, a titanium-based composite material double-layer shaped charge liner is obtained.

[0016] The above method uses low-cost metal powder as raw material and prepares the shaped charge liner through cold isostatic pressing and high-temperature sintering to near-net-shape. The process is simple and efficient, with low industrial production cost, short process, and high production efficiency. It is a feasible path for low-cost, short-process industrial production of shaped charge liners.

[0017] Preferably, the particle size of the sponge titanium powder is 10-50 μm, the particle size of the titanium hydride powder is 10-50 μm, and the particle size of the aluminum-niobium alloy powder is 5-50 μm; the Nb content in the aluminum-niobium alloy powder is 60 wt.%, the particle size of the niobium powder is 5-20 μm, the particle size of the titanium diboride powder, silicon powder, boron carbide powder, zirconium diboride powder, silicon carbide powder, and tungsten carbide powder is 1-10 μm, and the particle size of the aluminum rare earth alloy powder is 20-75 μm; the rare earth elements in the aluminum rare earth alloy powder include one or more of La, Ce, Pr, Nd, Er, Yb, and Dy, and the rare earth content of the aluminum rare earth alloy powder is 30-95 wt.%.

[0018] Raw material A forms a titanium-based composite material, and raw material B forms a titanium-based alloy; the titanium-based composite material comprises the following raw materials in weight percentages:

[0019] Ti powder 40-60 wt.%

[0020] 10-20 wt.% TiH2 powder

[0021] Al-Nb alloy powder 1-30 wt.%

[0022] Nb powder 0-30 wt.%

[0023] Titanium diboride powder, silicon powder, boron carbide powder, zirconium diboride powder, silicon carbide powder, and tungsten carbide powder, 0.6–15 wt.%

[0024] Aluminum rare earth alloy powder 0.5-8 wt.%

[0025] The sum of the mass percentages of all raw material powders is 100%.

[0026] Preferably, the ball-to-material ratio in the ball mill is (4-10):1, the ball milling speed is 100-400 r / min, the ball milling time is 1-6 h, and the ball milling is carried out under argon protection.

[0027] Preferably, the cold isostatic pressing pressure for both the primary and secondary cold pressing is 200–400 MPa, and the holding time is 5–40 min.

[0028] Preferably, the sintering temperature is 1200–1600℃, and the temperature is maintained for 2–5 hours. The sintering is carried out under vacuum or Ar atmosphere protection. By utilizing the oxygen absorption effect of rare earth elements during the sintering heating process, the formation of intermetallic compounds that easily generate pores is suppressed, achieving densification by atmospheric pressure sintering, increasing the density from 93% to over 98%.

[0029] In order to utilize the gravity effect of the hollow cone structure of the sintering liner during the softening and deformation process at high temperature to promote good metallurgical bonding at the interface of the inner and outer layers, preferably, during the sintering process, the larger end of the cross-sectional diameter of the second compact is placed downwards, a molybdenum alloy support fixture corresponding to the inner wall of the second compact is placed in the second compact, and sand is buried on the lower outer side of the second compact, the height of the buried sand being 1 / 3 to 1 / 2 of the height of the second compact; after sintering, it is cooled with the furnace.

[0030] Compared with the prior art, the advantages of the present invention are as follows:

[0031] ① To address the issue of high porosity in the atmospheric pressure sintering process of titanium alloy liner materials using elemental powder, one or more composite rare earth elements from La, Ce, Pr, Nd, Er, Yb, and Dy are added and introduced in the form of aluminum rare earth alloy powder. By utilizing the oxygen absorption effect of rare earth elements during the sintering heating process, the formation of intermetallic compounds that easily generate pores is inhibited, thereby achieving densification through atmospheric pressure sintering.

[0032] ② A double-layered propellant liner is prepared using titanium-based composite materials and their matrix components, titanium-based alloys. The outer layer is made of ceramic particle-reinforced titanium-based composite material, and the inner layer is made of titanium-based alloy with the same composition. Under explosive loading conditions, the inner titanium-based alloy first forms a high-ductility head jet to open a hole in the target, while the outer titanium-based composite material forms a large-diameter mid-to-rear section jet to continuously expand the hole. This achieves both high penetration depth and large-size opening damage to hard targets. The same titanium-based alloy composition ensures a good sintering metallurgical bonding state at the interface between the inner and outer layers of the propellant liner. Attached Figure Description

[0033] Figure 1 This is a cross-sectional view of the titanium-based composite double-layer propellant liner of Example 1;

[0034] Figure 2 This is a schematic diagram of the axial cross-section of the first mold;

[0035] Figure 3 This is a schematic diagram of the axial cross-section of the second mold;

[0036] Figure 4 This is a microstructure photograph of the titanium-based composite material in Example 1. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0038] Example 1

[0039] like Figure 1-4The image shows a preferred embodiment of the present invention. The titanium-based composite material double-layer shaped charge includes an inner layer 10 and an outer layer 20 disposed outside the inner layer 10. The inner layer 10 is a titanium-based alloy, and the outer layer 20 is a titanium-based composite material, which includes a ceramic reinforcing phase and a titanium-based alloy.

[0040] The titanium-based composite material composition is as follows: the volume fractions of TiB reinforcing phase and Ti5Si3 reinforcing phase are 3 vol.% and 1.5 vol.%, respectively. The titanium-based alloy comprises the following components by weight: 8% Al, 15% Nb, 1% RE, with the balance being Ti; the volume fraction of the titanium-based alloy is 95.5 vol.%.

[0041] The preparation method of a titanium-based composite material double-layer shaped charge liner includes the following steps:

[0042] ① Mixed raw materials: Ethanol was used as the ball milling medium and polyethylene glycol as the dispersant. The volume ratio of the ball milling medium to the powder was 2:1. The raw material A was ball milled and mixed using a planetary ball mill at a speed of 180 r / min, a ball-to-material ratio of 5:1, and a milling time of 3 h. After drying, a mixed powder A of (Ti+TiH2+Al-Nb+Nb+Al-Ce+TiB2+Si) was obtained.

[0043] Raw material B was ball-milled to obtain a mixed powder B of (Ti+TiH2+Al-Nb+Nb+Al-Ce). The ball-milling steps for raw material B were the same as those for raw material A.

[0044] Among them, the above-mentioned sponge titanium powder has a particle size of 40μm and a purity of 99.9%, the titanium hydride powder has a particle size of 30μm, the aluminum-niobium alloy powder has a particle size of 20μm, the Nb content of the aluminum-niobium alloy powder is 60wt%, and the balance is aluminum; the niobium powder has a particle size of 15μm and a purity of 99.9%; the aluminum-cerium alloy powder has a particle size of 30-70μm, the Ce content of the aluminum-cerium alloy powder is 85wt.%, and the particle size of both silicon powder and titanium diboride powder is 2μm.

[0045] ②One-time cold pressing: Powder B is placed in the first mold, sealed with a sealing plug, and then subjected to cold isostatic pressing. The cold pressing pressure is 200MPa, the holding time is 5min, and the first compact is obtained by demolding.

[0046] ③ Secondary cold pressing: The first compact is placed into the second mold, then powder A is loaded into the second mold until it is full, and then sealed with a sealing plug. Cold isostatic pressing is performed at a pressure of 200 MPa and a holding time of min. The second compact is then demolded.

[0047] like Figure 2 and 3As shown, the first mold and the second mold are two molds with similar shapes but different sizes, wherein the second mold is larger than the first mold. Both the first mold and the second mold include a core mold 1 and an outer mold 2 disposed on the outer layer of the core mold 1. The core mold 1 of the first mold and the second mold have the same size, but the outer mold 2 of the second mold is larger than the outer mold 2 of the first mold. An inner cavity 3 for filling material is formed between the core mold 1 and the outer mold 2. The top of the inner cavity 3 is open, and a sealing plug 4 is disposed at the opening of the inner cavity 3 to close the inner cavity 3.

[0048] ④ Sintering: The second compact is sintered with the larger diameter end facing down. A molybdenum alloy support fixture corresponding to the inner wall of the second compact is placed inside. Sand is buried on the lower outer side of the second compact. Zirconia is used for the buried sand, and the buried sand height is 1 / 3 to 1 / 2 of the height of the second compact. After sintering, the compact is cooled in the furnace at a temperature of 1300℃ and a holding time of 3h. Under argon protection, TiB2 and Si react with titanium powder in situ to generate TiB and Ti5Si3 reinforcing phases, resulting in a (TiB+Ti5Si3) / titanium-based alloy / / titanium-based alloy double-layer shaped charge blank.

[0049] ⑤ Machining: After turning and grinding the blank, the desired result is obtained. Figure 1 The titanium-based composite material double-layer propellant liner shown.

[0050] like Figure 4 The image shows the microstructure of the fabricated titanium-based composite double-layer shaped charge shield. The left image is a SEM image of the titanium-based composite material, and the two right images are TEM images of the ceramic reinforcement phase.

[0051] Example 2

[0052] The titanium-based composite material double-layer shaped charge includes an inner layer 10 and an outer layer 20 disposed outside the inner layer 10. The inner layer 10 is a titanium-based alloy, and the outer layer 20 is a titanium-based composite material, which includes a ceramic reinforcing phase and a titanium-based alloy.

[0053] The titanium-based composite material composition is as follows: the volume fractions of TiB, Ti5Si3, and SiC reinforcing phases are 4.5 vol.%, 1.5 vol.%, and 1 vol.%, respectively. The titanium-based alloy comprises the following components by weight: 15% Al, 20% Nb, 1.8% RE, with the balance being Ti; the volume fraction of the titanium-based alloy is 93 vol.%.

[0054] The preparation method of a titanium-based composite material double-layer shaped charge liner includes the following steps:

[0055] ① Mixed raw materials: Ethanol was used as the ball milling medium and polyethylene glycol as the dispersant. The volume ratio of the ball milling medium to the powder was 2:1. The raw material A was ball milled and mixed using a planetary ball mill at a speed of 250 r / min, a ball-to-material ratio of 8:1, and a milling time of 4 h. After drying, a mixed powder A of (Ti+TiH2+Al-Nb+Nb+Al-RE+TiB2+Si+SiC) was obtained.

[0056] Raw material B was ball-milled to obtain a mixed powder B of (Ti+TiH2+Al-Nb+Nb+Al-RE). The ball-milling steps for raw material B were the same as those for raw material A.

[0057] Among them, the particle size of the above-mentioned sponge titanium powder is 30μm, the particle size of the titanium hydride powder is 30μm, the particle size of the aluminum-niobium alloy powder is 25μm, the particle size of the niobium powder is 12μm, the particle size of the aluminum composite rare earth powder is 30-50μm, and the aluminum composite rare earth powder includes the following components by weight: 43% Ce, 21% La, 17% Nd, 5% Pr, with the balance being Al; the particle size of the silicon powder and titanium diboride powder is 3μm, and the particle size of the silicon carbide powder is 3μm.

[0058] ②One-time cold pressing: Powder B is placed in the first mold, sealed, and then subjected to cold isostatic pressing. The cold pressing pressure is 300MPa, the holding time is 15min, and the first compact is obtained by demolding.

[0059] ③ Secondary cold pressing: The first blank is placed into the second mold, then powder A is filled into the second mold and sealed. Cold isostatic pressing is performed at a pressure of 300 MPa and a holding time of 10 min. The second blank is then demolded.

[0060] ④ Sintering: The second compact is sintered with the larger diameter end facing down. A molybdenum alloy support fixture corresponding to the inner wall of the second compact is placed inside. Sand is buried on the lower outer side of the second compact. Zirconia is used for the buried sand, and the buried sand height is 1 / 3 to 1 / 2 of the height of the second compact. After sintering, the compact is cooled in the furnace at a temperature of 1350℃ and a holding time of 3h. Under argon protection, TiB2 and Si undergo an in-situ autogenous reaction with titanium powder to generate TiB, SiC and Ti5Si3 reinforcing phases, resulting in a (TiB+Ti5Si3+SiC) / titanium-based alloy / / titanium-based alloy double-layer shaped charge blank.

[0061] ⑤ Machining: The blank is turned and polished to obtain a titanium-based composite material double-layer propellant liner.

[0062] Example 3

[0063] The titanium-based composite material double-layer shaped charge includes an inner layer 10 and an outer layer 20 disposed outside the inner layer 10. The inner layer 10 is a titanium-based alloy, and the outer layer 20 is a titanium-based composite material, which includes a ceramic reinforcing phase and a titanium-based alloy.

[0064] The titanium-based composite material composition is as follows: the volume fractions of TiB, Ti5Si3, TiC, and SiC reinforcing phases are 3.5 vol.%, 3 vol.%, 0.5 vol.%, and 0.5 vol.%, respectively. The titanium-based alloy comprises the following components by weight: 18% Al, 28% Nb, 2.4% RE, with the balance being Ti; the volume fraction of the titanium-based alloy is 92.5 vol.%.

[0065] The preparation method of a titanium-based composite material double-layer shaped charge liner includes the following steps:

[0066] ① Mixed raw materials: Ethanol was used as the ball milling medium and polyethylene glycol as the dispersant. The volume ratio of the ball milling medium to the powder was 2:1. The raw material A was ball milled and mixed using a planetary ball mill at a speed of 200 r / min, a ball-to-material ratio of 6:1, and a milling time of 5 h. After drying, a mixed powder A of (Ti+TiH2+Al-Nb+Nb+Al-RE+TiB2+Si+B4C+ZrB2) was obtained.

[0067] Raw material B was ball-milled to obtain a mixed powder B of (Ti+TiH2+Al-Nb+Nb+Al-RE). The ball-milling steps for raw material B were the same as those for raw material A.

[0068] Among them, Ti is sponge titanium powder with a particle size of 40 μm; titanium hydride powder has a particle size of 25 μm; aluminum-niobium alloy powder has a particle size of 35 μm; niobium powder has a particle size of 10 μm; aluminum composite rare earth powder has a particle size of 40 μm; aluminum composite rare earth powder includes the following components by weight: 68% Ce, 16% Er, and the balance Al; silicon powder and titanium diboride powder have a particle size of 1-3 μm; B4C powder has a particle size of 3 μm; and ZrB2 powder has a particle size of 5 μm.

[0069] ②One-time cold pressing: Powder B is placed in the first mold, sealed, and then subjected to cold isostatic pressing. The cold pressing pressure is 350MPa, the holding time is 30min, and the first compact is obtained by demolding.

[0070] ③ Secondary cold pressing: The first blank is placed into the second mold, then powder A is filled into the second mold and sealed. Cold isostatic pressing is performed at a pressure of 300 MPa and a holding time of 10 min. The second blank is then demolded.

[0071] ④ Sintering: The second compact is sintered with the larger diameter end facing down. A molybdenum alloy support fixture corresponding to the inner wall of the second compact is placed inside. Sand is buried on the lower outer side of the second compact. Zirconia is used for the buried sand, and the buried sand height is 1 / 3 to 1 / 2 of the height of the second compact. After sintering, the compact is cooled in the furnace at a temperature of 1450℃ and a holding time of 4 hours. Under argon protection, titanium diboride powder and silicon powder undergo in-situ self-generation reactions with titanium powder to generate TiB, Ti5Si3TiC and ZrB reinforcing phases, respectively, to obtain a (TiB+Ti5Si3+TiC+SiC) / titanium-based alloy / / titanium-based alloy double-layer shaped charge blank.

[0072] ⑤ Machining: The blank is turned and polished to obtain a titanium-based composite material double-layer propellant liner.

[0073] The pore-opening effect of the titanium-based composite double-layer shaped charge obtained in Examples 1-3 on concrete and rock was tested, and the results are shown in Table 1. The test method is as follows:

[0074] Target test method: In Examples 1-3, a single-cone shaped charge liner was used for the target test. The liner diameter was 65mm, the cone angle was 64°, and the wall thickness was 2.4mm. The main charge was an 8701 cylindrical charge, the detonation charge was RDX, and the charge was detonated at the center using a No. 8 electric detonator.

[0075] Table 1. Test results of the double-layer titanium-based composite liner obtained in Examples 1-3

[0076]

[0077] The results above show that the layered titanium-based composite material provided by the present invention has a large opening size and stable opening effect when used in a shaped charge liner.

Claims

1. A titanium-based composite material double-layer shaped charge liner, characterized in that: The titanium-based composite material double-layer shaped charge includes an inner layer (10) and an outer layer (20) disposed outside the inner layer (10). The inner layer (10) is a titanium-based alloy, and the outer layer (20) is a titanium-based composite material. The titanium-based composite material includes a ceramic reinforcing phase and a titanium-based alloy. The ceramic reinforcing phase is one or more of TiB, TiC, Ti5Si3, WC, SiC, and ZrB. The titanium-based alloy comprises the following components by weight: 5-20% Al, 10-40% Nb, 0.5-5% RE, with the balance being Ti; wherein RE is one or more of La, Ce, Pr, Nd, Er, Yb, and Dy.

2. The titanium-based composite material double-layer shaped charge liner according to claim 1, characterized in that: The titanium-based composite material comprises: 1-20 vol.% ceramic reinforcing phase, with the balance being titanium-based alloy.

3. A method for preparing a titanium-based composite material double-layer shaped charge liner according to claim 1 or 2, characterized in that: Includes the following steps: ① Mixed raw materials: Raw material A is ball-milled and mixed to obtain powder A; raw material B is ball-milled and mixed to obtain powder B; raw material A includes sponge titanium powder, titanium hydride powder, aluminum-niobium alloy powder, niobium powder, aluminum rare earth alloy powder, titanium diboride powder, silicon powder, and raw material C, wherein raw material C is one or more of boron carbide powder, zirconium diboride powder, silicon carbide powder, and tungsten carbide powder; raw material B includes sponge titanium powder, titanium hydride powder, aluminum-niobium alloy powder, niobium powder, and aluminum rare earth alloy powder; ②One-time cold pressing: Powder B is placed in the first mold and cold isostatically pressed to obtain the first compact; ③ Secondary cold pressing: The first blank is placed into the second mold, then powder A is added, and the second blank is obtained after cold isostatic pressing. ④ Sintering: The second pressed blank is sintered and then cooled to obtain a blank; ⑤ Machining: After machining the blank, a titanium-based composite material double-layer propellant liner is obtained.

4. The method for preparing a titanium-based composite material double-layer shaped charge liner according to claim 3, characterized in that: The sponge titanium powder has a particle size of 10–50 μm, the titanium hydride powder has a particle size of 10–50 μm, and the aluminum-niobium alloy powder has a particle size of 5–50 μm; the Nb content in the aluminum-niobium alloy powder is 60 wt.%, the niobium powder has a particle size of 5–20 μm, the titanium diboride powder, silicon powder, boron carbide powder, zirconium diboride powder, silicon carbide powder, and tungsten carbide powder all have a particle size of 1–10 μm, and the aluminum rare earth alloy powder has a particle size of 20–75 μm; the rare earth elements in the aluminum rare earth alloy powder include one or more of La, Ce, Pr, Nd, Er, Yb, and Dy, and the rare earth content in the aluminum rare earth alloy powder is 30–95 wt.%.

5. The method for preparing a titanium-based composite material double-layer shaped charge liner according to claim 3, characterized in that: The ball-to-material ratio of the ball mill is (4-10):1, the ball milling speed is 100-400 r / min, the ball milling time is 1-6 h, and the ball milling is carried out under argon protection.

6. The method for preparing a titanium-based composite material double-layer shaped charge liner according to claim 3, characterized in that: The cold isostatic pressing pressure for both the primary and secondary cold pressing is 200–400 MPa, and the holding time is 5–40 min.

7. The method for preparing a titanium-based composite material double-layer shaped charge liner according to claim 3, characterized in that: The sintering temperature is 1200-1600℃, and the temperature is maintained for 2-5 hours. The sintering is carried out under vacuum or Ar atmosphere protection.

8. The method for preparing a titanium-based composite material double-layer propellant liner according to claim 7, characterized in that: During the sintering process, the larger diameter end of the second compact is placed downwards, and a molybdenum alloy support fixture corresponding to the inner wall of the second compact is placed inside the second compact. Sand is buried on the lower outer side of the second compact, and the height of the buried sand is 1 / 3 to 1 / 2 of the height of the second compact. After sintering, it is cooled with the furnace.

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