Lubricant composition for hot extrusion forming of titanium and titanium alloy seamless pipes and application of lubricant composition

Abstract

The invention discloses a lubricant composition for hot extrusion forming of titanium and titanium alloy seamless pipes and application of the lubricant composition. Glass powder with different softening temperatures is compounded according to a reasonable proportion, so that gradient softening can be performed in the extrusion heating process of titanium and titanium alloy, and a substrate lubricating film which stably exists from low temperature to high temperature is constructed; and graphite and molybdenum disulfide are used as reinforcing particles to form a composite lubricating layer which has the advantages of fluid lubrication and solid lubrication and is extremely stable, so that a lubricating film can continuously and stably play a role in the whole high-temperature, high-pressure and large-deformation harsh process of hot extrusion of titanium and titanium alloy, and the service life of the lubricating film is prolonged. Therefore, the high-quality pipe with smooth inner and outer surfaces is obtained.

Description

Technical Field

[0001] This invention relates to the field of titanium and titanium alloy processing technology, and particularly to a lubricant composition for hot extrusion molding of seamless titanium and titanium alloy tubes and its application. Background Technology

[0002] Titanium and titanium alloy tubing possess characteristics such as high strength, low density, excellent corrosion resistance, and good biocompatibility, making them widely used in aerospace, shipbuilding, petroleum, chemical, and medical fields. Seamless titanium and titanium alloy tubing is the most commonly used product, primarily manufactured through extrusion. Lubrication is crucial for obtaining high-quality extruded products. Extrusion under appropriate lubrication conditions not only yields high-quality extruded products and reduces extrusion energy consumption but also extends the service life of tools and dies. Glass lubrication is currently the preferred lubrication method for difficult-to-extrude metals such as titanium alloys because it is not only cost-effective but also provides good lubrication and offers good thermal insulation, oxidation resistance, and reduced hydrogen absorption. However, conventional single-component glass lubricants have significant limitations: their softening temperature range is narrow, making it difficult to cover the entire wide temperature range (approximately 0 to 1000°C) from heating to extrusion of titanium alloys. If the softening point is too low, excessive lubricant loss occurs before reaching the extrusion temperature; if the softening point is too high, insufficient melting during extrusion prevents the formation of an effective lubricating film, leading to lubrication failure. Furthermore, relying solely on glass lubrication can damage the lubricating film under the extremely high pressure of extrusion, leading to direct contact between the titanium alloy and the mold, causing "mold sticking" and resulting in scratches or even tears on the product surface. Therefore, it is necessary to develop a lubricant that combines excellent high-temperature lubricity and wide temperature range adaptability, providing better lubrication for the hot extrusion molding of seamless titanium and titanium alloy tubes. Summary of the Invention

[0003] Therefore, based on the above background, the present invention provides a lubricant composition for hot extrusion molding of seamless titanium and titanium alloy tubes and its application. It is made by mixing glass powders with different softening temperatures, and by the stepwise softening of the glass powders, a "base lubricating film" that is stable from low temperature to high temperature is constructed. On this basis, graphite and molybdenum disulfide are added as "reinforcing particles" to form a composite lubricating layer that has the advantages of both fluid lubrication and solid lubrication and is extremely stable. It has high temperature lubricity and wide temperature range adaptability, and can provide better lubrication effect for hot extrusion molding of seamless titanium and titanium alloy tubes.

[0004] The technical solution provided by this invention is as follows:

[0005] A lubricating composition for hot extrusion molding of seamless titanium and titanium alloy tubes, comprising the following raw materials in the indicated weight proportions:

[0006] Graphite powder 20%-30%, molybdenum disulfide 10%-20%, glass powder 35%-45%, adhesive 15%-18%, dispersant 2%-5%;

[0007] The glass powder is composed of glass powder A, glass powder B and glass powder C with different softening temperatures;

[0008] The softening temperature of the glass powder A is 500-600℃;

[0009] The softening temperature of the glass powder B is 560-800℃;

[0010] The softening temperature of the glass powder C is 800-980℃.

[0011] Furthermore, the glass powder is composed of glass powders with different softening temperatures in the following weight proportions:

[0012] Glass powder A 20-45%;

[0013] Glass powder B 30-60%;

[0014] Glass powder C 10%-35%.

[0015] Furthermore, it is composed of the following raw materials in the indicated weight proportions:

[0016] Graphite powder 25%, molybdenum disulfide 16%, glass powder 41%, adhesive 15%, dispersant 3%;

[0017] The glass powder is composed of glass powders with different softening temperatures in the following weight proportions:

[0018] Glass powder A 35%;

[0019] Glass powder B 45%;

[0020] Glass powder C 20%.

[0021] Furthermore, the adhesive is selected from at least one of polyvinyl alcohol and sodium silicate.

[0022] Furthermore, the dispersant is selected as low molecular weight sodium polyacrylate with a molecular weight of 2000-5000.

[0023] Based on the same inventive concept, the present invention also provides a lubricant for hot extrusion molding of seamless titanium and titanium alloy tubes, which is made from the following raw materials by weight: 55%-65% of the lubricating composition and 35-45% of the solvent.

[0024] Furthermore, it is made from the following raw materials by weight:

[0025] The lubricating composition is 61.5%, and the solvent is 38.5%.

[0026] The lubricating composition comprises the following raw materials in the indicated weight proportions:

[0027] Graphite powder 25%, molybdenum disulfide 16%, glass powder 41%, adhesive 15%, dispersant 3%;

[0028] The glass powder is composed of glass powders with different softening temperatures in the following weight proportions:

[0029] Glass powder A 35%;

[0030] Glass powder B 45%;

[0031] Glass powder C 20%.

[0032] Furthermore, the solvent used is water.

[0033] Based on the same inventive concept, the present invention also provides a hot extrusion forming method for seamless titanium and titanium alloy tubes, comprising the following steps:

[0034] 1) Sandblasting treatment is performed on the extruded titanium or titanium alloy billet;

[0035] 2) Preheat the extruded billet to 90℃-95℃;

[0036] After dispersing the lubricating composition in a solvent by stirring, a lubricating dilution is obtained.

[0037] 3) Immerse the preheated billet in the lubricating dilution solution for about 30-60 seconds, then remove and dry it;

[0038] 4) After heating the lubricated blank to the extrusion temperature, perform hot extrusion molding and then demold.

[0039] If the billet is titanium, the extrusion temperature is controlled at 820-870℃;

[0040] If the billet is titanium, the extrusion temperature is controlled at 900-950℃.

[0041] The beneficial effects achieved by this invention are as follows:

[0042] This invention utilizes a rational blend of glass powders with different softening temperatures to achieve a stepped softening of titanium and titanium alloys during extrusion heating, constructing a stable "base lubricating film" that exists from low to high temperatures. Furthermore, graphite and molybdenum disulfide are added as "reinforcing particles" to form an extremely stable composite lubricating layer that combines the advantages of both fluid and solid lubrication. This ensures that the lubricating film can function continuously and stably throughout the harsh process of high temperature, high pressure, and large deformation during the hot extrusion of titanium and titanium alloys, resulting in high-quality pipes with smooth inner and outer surfaces.

[0043] In the lubricating composition of this invention, glass powder with a softening temperature of 500-600°C softens first during the hot extrusion of titanium and titanium alloys, begins to fill the coating pores, and initially forms a binder phase, preparing for the subsequent melting of glass powder and providing a certain degree of lubrication and air isolation to prevent excessive oxidation of the titanium billet. Glass powder with a softening temperature of 560-800°C softens and melts in large quantities in the temperature range before reaching the extrusion temperature. It fuses with the softened A phase to form the main lubricating film, effectively undertaking the lubrication task in this temperature range and ensuring that a basically complete protective layer is formed before the billet reaches the highest temperature. Glass powder with a softening temperature of 800-980°C is highly matched with the extrusion temperature (800-1000°C) of titanium and titanium alloys. At the highest temperature stage of extrusion, it melts completely, but because of its relatively high viscosity at high temperatures, it can maintain the viscosity and thickness of the lubricating film, preventing it from being easily squeezed out under high pressure, thereby ensuring that there is still a stable glass lubricating film separating the die and the titanium material at the moment of most intense extrusion deformation. In this invention, graphite and molybdenum disulfide work together to act as solid lubricants, enhancing the lubrication effect: In the fluid lubrication film formed by the glass melt, graphite particles, as a solid lubricating phase, can greatly enhance the compressive and shear resistance of the lubrication film under extreme high pressure, while molybdenum disulfide can strengthen lubrication in the medium and low temperature stages and, together with graphite, provide support for the glass lubrication film. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] The technical solution of this invention is as follows:

[0046] A lubricating composition for hot extrusion molding of seamless titanium and titanium alloy tubes, comprising the following raw materials in the indicated weight proportions:

[0047] Graphite powder 20%-30%, molybdenum disulfide 10%-20%, glass powder 35%-45%, adhesive 15%-18%, dispersant 2%-5%;

[0048] The glass powder is composed of glass powder A, glass powder B and glass powder C with different softening temperatures;

[0049] The softening temperature of the glass powder A is 500-600℃;

[0050] The softening temperature of the glass powder B is 560-800℃;

[0051] The softening temperature of the glass powder C is 800-980℃.

[0052] The glass powder is composed of glass powders with different softening temperatures in the following weight proportions:

[0053] Glass powder A 20-45%;

[0054] Glass powder B 30-60%;

[0055] Glass powder C 10%-35%.

[0056] The adhesive is selected from at least one of polyvinyl alcohol and sodium silicate. The adhesive is mainly used to ensure the strength and toughness of the lubricated coating after drying, and to prevent the coating from becoming brittle and peeling off due to excessive high-hardness particles. High-solids content slurries are more prone to settling and clumping, so it is necessary to appropriately increase the amount of dispersant to ensure the uniformity of the slurry during storage and coating.

[0057] The particle size D90 of graphite powder, molybdenum disulfide and glass powder is less than 10 micrometers.

[0058] The dispersant is selected as low molecular weight sodium polyacrylate with a molecular weight of 2000-5000.

[0059] Furthermore, based on the lubricating composition, this invention also provides a lubricant for the hot extrusion molding of seamless titanium and titanium alloy tubing.

[0060] It is made from the following raw materials by weight: 55%-65% of the lubricating composition and 35-45% of the solvent;

[0061] Water can be used as a solvent, but the choice is not limited to this and can be made according to the actual situation.

[0062] In specific applications, the glass powders of the present invention with different softening temperatures can be selected from the glass powders with the compositions shown in Table 1.

[0063] Table 1: Composition of glass powder

[0064]

[0065] The specific composition of the glass powder used in the following embodiments is shown in Table 2:

[0066] Table 2: Composition of glass powder used in the following examples

[0067]

[0068] Example 1: A lubricant for hot extrusion molding of seamless titanium and titanium alloy tubes, which is made from the following raw materials by weight:

[0069] The lubricating composition is 61.5% water and 38.5% water.

[0070] The lubricating composition comprises the following raw materials in the indicated weight proportions:

[0071] Graphite powder 25%, molybdenum disulfide 16%, glass powder 41%, adhesive 15%, dispersant 3%;

[0072] The glass powder is composed of glass powders with different softening temperatures in the following weight proportions:

[0073] Glass powder A 35%;

[0074] Glass powder B 45%;

[0075] Glass powder C 20%.

[0076] The softening temperature of the glass powder A is 500-600℃;

[0077] The softening temperature of the glass powder B is 560-800℃;

[0078] The softening temperature of the glass powder C is 800-980℃.

[0079] The adhesive is polyvinyl alcohol, and the dispersant is sodium polyacrylate with a molecular weight of 2000-5000.

[0080] Comparative Example 1: A lubricant for hot extrusion molding of seamless titanium and titanium alloy tubes. Compared with Example 1, the glass powder in this comparative example is composed of a single glass powder B.

[0081] Comparative Example 2: A lubricant for hot extrusion molding of seamless titanium and titanium alloy tubes. Compared with Example 1, the glass powder in this comparative example is composed of a single glass powder C.

[0082] Glass powder A has a low softening temperature. When using only glass powder A, the billet will pass through its softening temperature range (500-600℃) when heated from room temperature to the extrusion temperature (approximately 920℃). During this stage, glass powder A will soften and melt prematurely. Due to the high temperature range and long time required before actual extrusion, this prematurely formed molten glass film will be significantly lost, dripped, or unevenly distributed due to gravity, surface tension of the billet, and the flow of the furnace atmosphere. By the time the billet reaches the 920℃ extrusion temperature, the lubricant coating on the billet surface is almost completely depleted, making it impossible to form a complete, continuous, and sufficiently thick lubricating film. Experiments have shown that it cannot provide lubrication for the extrusion molding of titanium and titanium alloys; therefore, no comparative example was included.

[0083] Comparative Example 3: A lubricant for hot extrusion molding of seamless titanium and titanium alloy tubes. Compared with Example 1, the glass powder in this comparative example is composed of glass powders with different softening temperatures in the following weight proportions:

[0084] Glass powder A 60%;

[0085] Glass powder B 30%;

[0086] Glass powder C 10%.

[0087] Comparative Example 4: A lubricant for hot extrusion molding of seamless titanium and titanium alloy tubes. Compared with Example 1, the glass powder in this comparative example is composed of glass powders with different softening temperatures in the following weight proportions:

[0088] Glass powder A 35%;

[0089] Glass powder B 45%;

[0090] Glass powder C 20%.

[0091] Comparative Example 5: A lubricant for hot extrusion molding of seamless titanium and titanium alloy tubes. Compared with Example 1, the lubricating composition of this comparative example consists of the following raw materials in the indicated weight proportions:

[0092] Graphite powder 15%, molybdenum disulfide 26%, glass powder 41%, adhesive 15%, dispersant 3%.

[0093] Comparative Example 6: A lubricant for hot extrusion molding of seamless titanium and titanium alloy tubes. Compared with Example 1, the lubricating composition of this comparative example consists of the following raw materials in the indicated weight proportions:

[0094] Graphite powder 40%, molybdenum disulfide 10%, glass powder 41%, adhesive 15%, dispersant 3%;

[0095] Comparative Example 7: A lubricant for hot extrusion molding of seamless titanium and titanium alloy tubes. Compared with Example 1, the lubricating composition of this comparative example consists of the following raw materials in the indicated weight proportions:

[0096] Graphite powder 47.2%, molybdenum disulfide 23.8%, glass powder 21%, adhesive 15%, dispersant 3%.

[0097] Compared to Example 1, this comparative example replaces 20% of the glass powder with graphite powder and molybdenum disulfide in a specific ratio.

[0098] Comparative Example 8: A lubricant for hot extrusion molding of seamless titanium and titanium alloy tubes. Compared with Example 1, the lubricating composition of this comparative example consists of the following raw materials in the indicated weight proportions:

[0099] Graphite powder 18.9%, molybdenum disulfide 12.1%, glass powder 51%, adhesive 15%, dispersant 3%;

[0100] Compared to Example 1, this comparative example replaces 10% of the graphite powder and molybdenum disulfide with glass powder.

[0101] (1) Performance testing

[0102] The stable coefficients of friction for the lubricants of Example 1, Comparative Examples 1 to 8 were tested at 600°C, 800°C, and 950°C, respectively. The tests were conducted using an RTEC MFT-500 high-temperature friction testing machine under an inert atmosphere (ball-disc test), as follows:

[0103] Sample preparation: The disc-shaped titanium alloy (TC4) sample was sandblasted to clean and roughen its surface; the titanium alloy sample was preheated to 90℃-95℃; the lubricating composition was added to the solvent and stirred to disperse it, resulting in a lubricating diluent; the preheated blank was immersed in the lubricating diluent for about 30-60 seconds, then removed and dried. The thickness of the dried lubricating coating was about 1 mm. The coated sample was then dried in an oven at 120°C for 20-30 minutes. Then it was placed in a muffle furnace and heated to the target experimental temperature under a protective atmosphere (such as argon), and held at that temperature for a period of time to allow the glass powder to fully melt and sinter, forming the lubricating coating.

[0104] Upper sample: H13 hot work die steel friction ball;

[0105] During testing, the parameters were set as follows: normal load of 200N and sliding speed of 0.15 m / s.

[0106] The test results are shown in Table 3.

[0107] Table 3: Stable Friction Coefficient

[0108]

[0109] As can be seen from the above, the lubricant in Example 1 can achieve excellent lubrication throughout the process, and the coefficient of friction decreases with increasing temperature (resulting in a more perfect glass liquid film). Based on the results, it can be inferred that in Comparative Example 1, the single medium-temperature glass powder B did not fully soften at 600°C, resulting in mediocre lubrication; at 950°C, it overheated and lost its lubrication. In Comparative Example 2, the single high-temperature glass powder C did not fully melt at 600 / 800°C, resulting in extremely poor lubrication; it only achieved a good effect at 950°C. In Comparative Example 3, there was too much low-temperature glass powder A and too little high-temperature glass powder C, leading to poor lubrication at high temperatures. The lubricating film was unstable, resulting in poor overall performance. Although Comparative Example 4 performed better than Comparative Example 3, its stability over a wide temperature range was still inferior to Example 1. Comparative Example 5 had too little graphite and too much MoS2. MoS2 is easily oxidized at high temperatures, leading to a slight decrease in high-temperature lubrication performance. Comparative Example 6 had too much graphite, which disrupted the continuity of the glass film, resulting in poor lubrication performance under high temperature and pressure. Comparative Example 7 had a severely insufficient glass substrate, making it impossible to form a continuous film. Lubrication failed completely, resulting in an extremely high coefficient of friction. Comparative Example 8 had insufficient solid lubricant, which resulted in a low initial coefficient of friction, but poor performance under high pressure (high temperature).

[0110] Lubrication effect experiment:

[0111] ① The titanium alloy (TC4) sample is sandblasted to clean and roughen its surface; the titanium alloy sample is preheated to 90℃-95℃; the lubricating composition of each group is added to the solvent and stirred to disperse it, so as to obtain a lubricating diluent; the preheated blank is immersed in the lubricating diluent for about 30-60 seconds and then taken out and dried. The thickness of the lubricating coating after drying is about 1mm. The coated sample is dried in an oven at 120°C for 20-30 minutes.

[0112] The coated blank was heated to 920℃ using a thermal simulation tester and kept at that temperature for a period of time to ensure uniform temperature. The maximum extrusion pressure was then measured, as shown in Table 4.

[0113] Table 4: Maximum Extrusion Pressure (kN)

[0114]

[0115] The extrusion pressure is positively correlated with the coefficient of friction. Better lubrication results in less friction and requires lower extrusion pressure. Example 1 exhibits the lowest extrusion pressure. Comparative Example 7 (discontinuous lubricating film) shows the highest extrusion pressure, approaching or reaching a state of no lubrication. Comparative Example 2 also exhibits high extrusion pressure due to insufficient melting at the test temperature.

[0116] ② The titanium alloy (TC4) billet is sandblasted to clean and roughen its surface; the titanium alloy sample is preheated to 90℃-95℃; the lubricating composition is added to the solvent and stirred to disperse it, thus obtaining a lubricating diluent; the preheated billet is immersed in the lubricating diluent for about 30-60 seconds, then removed and dried. The thickness of the lubricating coating after drying is about 1mm. The billet coated with lubricant is heated to 920℃, then hot-extruded and demolded.

[0117] Each group used a mold of the same material to extrude tubes. Each group used the previous step to prepare 50 20cm titanium alloy tubes. The surface roughness (Ra, μm) of the titanium alloy tubes was tested, and the average roughness was statistically analyzed. The changes in the size of the mold (radius of the extrusion hole in mm) were also statistically analyzed. The results are shown in Table 5.

[0118]

[0119] As can be seen from the above, the molds of Comparative Example 7 showed severe wear, and the surface of the extruded titanium alloy tubes showed severe scratches.

[0120] Poor lubrication can lead to defects such as scratches and orange peel on the pipe surface, increasing roughness. Example 1 showed the best surface quality. Comparative Example 7, due to direct sticking to the mold, had very poor roughness. Lubrication failure caused direct contact between the mold and the titanium alloy, exacerbating wear. Example 1 provided the best protection for the mold, resulting in minimal wear. Comparative Examples 2 and 7 showed the most severe mold wear.

[0121] Based on the above tests, it is evident that Example 1 exhibits the best overall performance, namely the lowest coefficient of friction, the lowest extrusion pressure, the lowest pipe surface roughness, and the lowest mold wear. Comparative Examples 1 and 2, with glass powders having a single softening temperature, cannot achieve continuous lubrication over a wide temperature range, resulting in poor lubrication performance outside their optimal softening temperature range. Comparative Example 1 (medium-temperature glass B) may fail at a high temperature of 950°C due to excessively low viscosity; Comparative Example 2 (high-temperature glass C) may not have fully melted at a low temperature of 600°C, resulting in poor lubrication. The glass powders with different softening temperatures in Comparative Examples 3 and 4, especially the excessively high or low proportion of glass powder A, disrupt the gradient softening process, leading to significantly worse lubrication performance than Example 1. In Comparative Examples 5 and 6, the excessively high or low proportion of graphite powder and molybdenum disulfide disrupts the synergistic effect between the glass matrix and the solid lubricant; too little graphite (Comparative Example 5) results in insufficient extreme pressure anti-wear properties; too much graphite (Comparative Example 6) may disrupt the continuity of the glass film. Comparative Example 7 (excessive solid lubricant) resulted in insufficient glass matrix, preventing the formation of a complete and continuous lubricating film, leading to a sharp deterioration in lubrication performance. Comparative Example 8 (excessive glass powder) resulted in insufficient solid lubricant, making the lubricating film easily punctured under extreme pressure, resulting in insufficient wear resistance and potentially increasing the coefficient of friction and mold wear.

[0122] The present invention and its embodiments have been described above. This description is not restrictive, and the embodiments shown are only one of the embodiments of the present invention. The actual structure is not limited to this. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A lubricating composition for hot extrusion molding of seamless titanium and titanium alloy tubes, characterized in that, It is composed of the following raw materials in the following weight proportions: Graphite powder 20%-30%, molybdenum disulfide 10%-20%, glass powder 35%-45%, adhesive 15%-18%, dispersant 2%-5%; The glass powder is composed of glass powder A, glass powder B and glass powder C with different softening temperatures; The softening temperature of the glass powder A is 500-600℃; The softening temperature of the glass powder B is 560-800℃; The softening temperature of the glass powder C is 800-980℃.

2. The lubricating composition for hot extrusion molding of seamless titanium and titanium alloy tubes according to claim 1, characterized in that, The glass powder is composed of glass powders with different softening temperatures in the following weight proportions: Glass powder A 20-45%; Glass powder B 30-60%; Glass powder C 10%-35%.

3. The lubricating composition for hot extrusion molding of seamless titanium and titanium alloy tubes according to claim 2, characterized in that, It is composed of the following raw materials in the following weight proportions: Graphite powder 25%, molybdenum disulfide 16%, glass powder 41%, adhesive 15%, dispersant 3%; The glass powder is composed of glass powders with different softening temperatures in the following weight proportions: Glass powder A 35%; Glass powder B 45%; Glass powder C 20%.

4. A lubricating composition for hot extrusion molding of seamless titanium and titanium alloy tubing according to any one of claims 1 to 3, characterized in that, The adhesive is selected from at least one of polyvinyl alcohol and sodium silicate.

5. A lubricating composition for hot extrusion molding of seamless titanium and titanium alloy tubing according to any one of claims 1 to 3, characterized in that, The dispersant is selected as low molecular weight sodium polyacrylate with a molecular weight of 2000-5000.

6. The use of the lubricating composition according to any one of claims 1 to 5 in the extrusion molding of titanium and titanium alloys.

7. A lubricant for hot extrusion molding of seamless titanium and titanium alloy tubes, characterized in that, It is made from the following raw materials by weight: 55%-65% of the lubricating composition as described in any one of claims 1 to 5 and 35%-45% of solvent.

8. The lubricant for hot extrusion molding of seamless titanium and titanium alloy tubes according to claim 7, characterized in that, It is made from the following raw materials by weight: The lubricating composition is 61.5%, and the solvent is 38.5%. The lubricating composition comprises the following raw materials in the indicated weight proportions: Graphite powder 25%, molybdenum disulfide 16%, glass powder 41%, adhesive 15%, dispersant 3%; The glass powder is composed of glass powders with different softening temperatures in the following weight proportions: Glass powder A 35%; Glass powder B 45%; Glass powder C 20%.

9. The lubricant for hot extrusion molding of seamless titanium and titanium alloy tubes according to claim 7, characterized in that, The solvent used is water.

10. A method for hot extrusion forming of seamless titanium and titanium alloy tubes, characterized in that, Includes the following steps: 1) The titanium or titanium alloy billet to be extruded is subjected to sandblasting treatment; 2) Preheat the billet to be extruded to 90℃-95℃; After dispersing the lubricating composition according to any one of claims 7 to 9 in a solvent by stirring, a lubricating dilution is obtained; 3) Immerse the preheated billet in the lubricating dilution solution for about 30-60 seconds, then remove and dry it; 4) After heating the lubricated blank to the extrusion temperature, perform hot extrusion molding and then demold. in: If the billet is titanium, the extrusion temperature should be controlled at 820-870℃; If the billet is titanium, the extrusion temperature is controlled at 900-950℃.

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