A kind of ultra-high hardness boron carbide ceramic material

Abstract

The invention discloses an ultra-high hardness boron carbide ceramic material, the raw material components of the ultra-high hardness boron carbide ceramic material are B4C powder and Ti6Al4V powder, the volume percentage content of B4C powder is 95-99.5%, and the volume percentage content of Ti6Al4V powder is 0.5-5%. The preparation method thereof comprises the following steps: A. Powder mixing: B4C powder and Ti6Al4V powder are mixed by planetary ball milling in proportion, and the ball milling medium is zirconium oxide ball and anhydrous ethanol; B. Discharge plasma sintering: the ball-milled mixed powder is placed in a graphite mold, and the graphite mold is placed in a discharge plasma sintering cavity for sintering to obtain an ultra-high hardness boron carbide ceramic material, and the ultra-high hardness boron carbide ceramic material is taken out from the graphite mold after cooling. The invention overcomes the existing densification problem of boron carbide ceramics and successfully prepares an ultra-high hardness boron carbide ceramic material.

Description

Technical Field

[0001] The invention relates to a bulletproof ceramic material, in particular to an ultra-high hardness boron carbide ceramic material. Background Art

[0002] Boron carbide (B4C) is one of the hardest substances in nature, with a hardness of up to 29.1GPa and an extremely low density of 2.52g / cm 3 , is widely used in armor, cutting tools, high-temperature structural materials, etc. Especially in bulletproof armor, its ultra-high hardness and extremely low density are very important for the material's bulletproof performance. At present, bulletproof armor mainly uses alumina ceramic materials, while boron carbide ceramics are harder and lighter than alumina ceramics, making them more suitable for bulletproof armor.

[0003] However, densification of boron carbide ceramics has always been a difficult problem. Even at a high temperature of 2300°C, it is still impossible to fully densify boron carbide ceramics without pressure-assisted sintering. Summary of the invention

[0004] The purpose of the present invention is to provide an ultra-high hardness boron carbide ceramic material, which overcomes the existing densification problem of boron carbide ceramics and successfully prepares an ultra-high hardness boron carbide ceramic material.

[0005] The technical solution of the present invention is as follows:

[0006] A super-high hardness boron carbide ceramic material, the raw material components of the super-high hardness boron carbide ceramic material are B4C powder and Ti6Al4V powder, the volume percentage content of the B4C powder is 95-99.5%, the volume percentage content of the Ti6Al4V powder is 0.5-5%, and the preparation method of the super-high hardness boron carbide ceramic material comprises the following steps:

[0007] A. Powder mixing: B4C powder and Ti6Al4V powder are mixed by planetary ball milling in proportion, and the ball milling media are zirconia balls and anhydrous ethanol;

[0008] B. Spark plasma sintering: The mixed powder after ball milling is placed in a graphite mold, and then the graphite mold is placed in a spark plasma sintering cavity for sintering to obtain an ultra-high hardness boron carbide ceramic material. After cooling, the ultra-high hardness boron carbide ceramic material is taken out from the graphite mold.

[0009] The particle size of the B4C powder is 1 μm, and the particle size of the Ti6Al4V powder is 30 μm.

[0010] In step A, the ball-to-material ratio of the planetary ball mill is 2:1.

[0011] In step A, the ball milling speed is 300 rpm and the ball milling time is 24 hours.

[0012] In step A, after ball milling, the mixed powder is taken out and dried for 24 hours.

[0013] In step B, the sintering temperature is 1800° C., the sintering pressure is 50 MPa, the sintering speed is 100° C. / min, and the holding time is 2 minutes.

[0014] Compared with the prior art, the beneficial effect of the present invention is that the present invention successfully prepares ultra-high hardness boron carbide ceramic material by adding Ti6Al4V alloy to the boron carbide matrix and adopting spark plasma sintering, and its preparation time can be reduced from 24 hours of traditional sintering to less than 30 minutes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 The density test diagrams of Examples 1 to 3 of the present invention and pure B4C are shown;

[0017] Figure 2 The hardness test diagrams of Examples 1 to 3 of the present invention and pure B4C;

[0018] Figure 3 This is the SEM microstructure of pure B4C;

[0019] Figure 4 This is the SEM microstructure diagram of Example 1 of the present invention;

[0020] Figure 5 This is the SEM microstructure diagram of Example 2 of the present invention;

[0021] Figure 6 This is the SEM microstructure diagram of Example 3 of the present invention;

[0022] Figure 7 1 to 3 are XRD diagrams of Examples 1 to 3 of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] The present invention provides an ultra-high hardness boron carbide ceramic material, which is formed by mixing and sintering B4C powder and Ti6Al4V powder, wherein the volume percentage content of B4C powder is 95-99.5%, and the particle size is 1 μm; the volume percentage content of Ti6Al4V powder is 0.5-5%, and the particle size is 30 μm.

[0025] In order to illustrate the technical solution of the present invention, a specific embodiment is provided below for illustration.

[0026] Example 1

[0027] This embodiment provides a method for preparing an ultra-high hardness boron carbide ceramic material, comprising the following steps:

[0028] A. Powder mixing: 19.8g B4C powder and 0.18g Ti6Al4V powder were mixed in proportion, 40g zirconium oxide balls and 200ml anhydrous ethanol were added, and the mixture was put into a ball milling jar. The mixture was milled and mixed using a planetary ball mill with a ball-to-material ratio of 2:1, a ball milling speed of 300 rpm, and a ball milling time of 24 hours. After ball milling, the mixed powder was taken out and dried for 24 hours.

[0029] B. Spark plasma sintering: 1.5 g of the ball-milled mixed powder is placed in a graphite mold with a diameter of 12 mm, and then the graphite mold is placed in a spark plasma sintering cavity for sintering. The sintering temperature is 1800°C, the sintering pressure is 50 MPa, the sintering speed is 100°C / min, and the insulation time is 2 minutes. After cooling in the furnace, the ultra-high hardness boron carbide ceramic material is taken out from the graphite mold.

[0030] Example 2

[0031] This embodiment provides a method for preparing an ultra-high hardness boron carbide ceramic material, comprising the following steps:

[0032] A. Powder mixing: 19.6g B4C powder and 0.35g Ti6Al4V powder were mixed in proportion, 40g zirconium oxide balls and 200ml anhydrous ethanol were added, and the mixture was put into a ball milling jar. The mixture was milled and mixed using a planetary ball mill with a ball-to-material ratio of 2:1, a ball milling speed of 300 rpm, and a ball milling time of 24 hours. After ball milling, the mixed powder was taken out and dried for 24 hours.

[0033] B. Spark plasma sintering: 1.5 g of the ball-milled mixed powder is placed in a graphite mold with a diameter of 12 mm, and then the graphite mold is placed in a spark plasma sintering cavity for sintering. The sintering temperature is 1800°C, the sintering pressure is 50 MPa, the sintering speed is 100°C / min, and the insulation time is 2 minutes. After cooling in the furnace, the ultra-high hardness boron carbide ceramic material is taken out from the graphite mold.

[0034] Example 3

[0035] This embodiment provides a method for preparing an ultra-high hardness boron carbide ceramic material, comprising the following steps:

[0036] A. Powder mixing: 18.2g B4C powder and 1.7g Ti6Al4V powder were mixed in proportion, 40g zirconium oxide balls and 200ml anhydrous ethanol were added, and the mixture was put into a ball milling jar. The mixture was milled and mixed using a planetary ball mill with a ball-to-material ratio of 2:1, a ball milling speed of 300 rpm, and a ball milling time of 24 hours. After ball milling, the mixed powder was taken out and dried for 24 hours.

[0037] B. Spark plasma sintering: 1.5 g of the ball-milled mixed powder is placed in a graphite mold with a diameter of 12 mm, and then the graphite mold is placed in a spark plasma sintering cavity for sintering. The sintering temperature is 1800°C, the sintering pressure is 50 MPa, the sintering speed is 100°C / min, and the insulation time is 2 minutes. After cooling in the furnace, the ultra-high hardness boron carbide ceramic material is taken out from the graphite mold.

[0038] The density and hardness of Examples 1 to 3 and pure B4C were tested by Archimedes method. The test results are as follows: Figure 1 , Figure 2 shown. Figures 3 to 6 The SEM microstructure diagrams of pure B4C and Examples 1 to 3 are shown. Figure 7 The XRD diagrams of Examples 1 to 3 are shown in FIG.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultra-high hardness boron carbide ceramic material, characterized in that: The preparation method comprises the following steps: A. Powder mixing: 19.6g B4C powder and 0.35g Ti6Al4V powder were mixed in proportion, 40g zirconium oxide balls and 200ml anhydrous ethanol were added, and the mixture was put into a ball milling jar. The mixture was milled and mixed using a planetary ball mill with a ball-to-material ratio of 2:1, a ball milling speed of 300 rpm, and a ball milling time of 24 hours. After ball milling, the mixed powder was taken out and dried for 24 hours. B. Spark plasma sintering: 1.5 g of the ball-milled mixed powder is placed in a graphite mold with a diameter of 12 mm, and then the graphite mold is placed in a spark plasma sintering cavity for sintering. The sintering temperature is 1800°C, the sintering pressure is 50 MPa, the sintering speed is 100°C / min, and the insulation time is 2 minutes. After cooling in the furnace, the ultra-high hardness boron carbide ceramic material is taken out from the graphite mold.

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