阅读说明：本技术 一种碳化硼基金属陶瓷复合材料的制备方法 (Preparation method of boron carbide-based metal ceramic composite material ) 是由 李少峰 李友宝 励永平 于 2019-09-26 设计创作，主要内容包括：本发明公开一种碳化硼基金属陶瓷复合材料的制备方法,包括以下步骤：1)按重量份数称取以下各原料：碳化硼76-96.9份,氧化锆1-5份,氧化钇1-4份,碳化铬1-5份,钴镍合金0.1-10份；2)首先将碳化硼、碳化铬混合球磨至平均粒径为10-50um；用喷雾干燥塔制粒,加入烧结炉中于1400-1600℃烧结5-12h,保温1-3h,冷却后再次球磨至平均粒径为15-30um获得烧结料；本发明制备的碳化硼基金属陶瓷复合材料具有良好的各向同性、组织均匀性、导热性、抗氧化性及高温抗蠕变性。(The invention discloses a preparation method of a boron carbide-based metal ceramic composite material, which comprises the following steps: 1) weighing the following raw materials in parts by weight: 76-96.9 parts of boron carbide, 1-5 parts of zirconia, 1-4 parts of yttrium oxide, 1-5 parts of chromium carbide and 0.1-10 parts of cobalt-nickel alloy; 2) firstly, mixing and ball-milling boron carbide and chromium carbide until the average grain diameter is 10-50 um; granulating by a spray drying tower, sintering for 5-12h at 1400-1600 ℃ in a sintering furnace, preserving heat for 1-3h, cooling, and then ball-milling again until the average particle size is 15-30um to obtain a sintered material; the boron carbide-based metal ceramic composite material prepared by the invention has good isotropy, tissue uniformity, thermal conductivity, oxidation resistance and high-temperature creep resistance.)

1. A preparation method of a boron carbide-based metal ceramic composite material is characterized by comprising the following steps:

1) weighing the following raw materials in parts by weight: 76-96.9 parts of boron carbide, 1-5 parts of zirconia, 1-4 parts of yttrium oxide, 1-5 parts of chromium carbide and 0.1-10 parts of cobalt-nickel alloy;

2) firstly, mixing and ball-milling boron carbide and chromium carbide until the average grain diameter is 10-50 um; granulating by a spray drying tower, sintering for 5-12h at 1400-1600 ℃ in a sintering furnace, preserving heat for 1-3h, cooling, and then ball-milling again until the average particle size is 15-30um to obtain a sintered material;

3) adding zirconium oxide, yttrium oxide and cobalt-nickel alloy into a ball mill, ball-milling until the average particle size is 100-200 nm, uniformly mixing with the sintering material prepared in the step 2), granulating by a spray drying tower, drying until the water content of the granules is 0.7-2.5wt%, and sieving by a 60-80 mesh sieve;

4) pressing and molding the granules sieved in the step 3) under the molding pressure of 0.8-3.5T/cm²(ii) a Then adding the mixture into a sintering furnace for sintering at the sintering temperature of 1400 ℃ and 1600 ℃, preserving the heat for 0.5-5h, cooling and polishing to obtain the boron carbide-based metal ceramic composite material.

2. The method for preparing a boron carbide-based cermet composite material according to claim 1, wherein the weight ratio of cobalt to nickel in the cobalt-nickel alloy is: 1:(1.5-5).

3. The method for producing a boron carbide-based cermet composite material according to claim 1, characterized in that the sintering temperature in step 2) is 1600 ℃.

4. The method for producing a boron carbide-based cermet composite material according to claim 1, characterized in that the sintering temperature in step 4) is 1600 ℃.

5. The method for producing a boron carbide-based cermet composite material according to claim 1, characterized in that the forming pressure in step 4) is 2T/cm²。

Technical Field

The invention relates to the technical field of ceramic composite materials, in particular to a preparation method of a boron carbide-based metal ceramic composite material.

Background

The existing boron carbide-based ceramic composite material has the defects of high brittleness, poor fracture toughness, corrosion resistance and wear resistance, and the isotropy, the structural uniformity, the oxidation resistance and the high-temperature creep resistance are all required to be improved, and the main reason for the defects is that the distribution of all components in the composite material in crystals is not coordinated, and particularly, the affinity among various components influences the grain boundary performance, so that the method for preparing the high-strength and high-toughness boron carbide-based metal ceramic composite material with good isotropy, structural uniformity, thermal conductivity, oxidation resistance and high-temperature creep resistance has important significance.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art: provides a preparation method of a high-strength and high-toughness boron carbide-based metal ceramic composite material with good isotropy, structure uniformity, thermal conductivity, oxidation resistance and high-temperature creep resistance.

The technical solution of the invention is as follows: a preparation method of a boron carbide-based metal ceramic composite material comprises the following steps:

1) weighing the following raw materials in parts by weight: 76-96.9 parts of boron carbide, 1-5 parts of zirconia, 1-4 parts of yttrium oxide, 1-5 parts of chromium carbide and 0.1-10 parts of cobalt-nickel alloy;

2) firstly, mixing and ball-milling boron carbide and chromium carbide until the average grain diameter is 10-50 um; granulating by a spray drying tower, sintering for 5-12h at 1400-1600 ℃ in a sintering furnace, preserving heat for 1-3h, cooling, and then ball-milling again until the average particle size is 15-30um to obtain a sintered material;

3) adding zirconium oxide, yttrium oxide and cobalt-nickel alloy into a ball mill, ball-milling until the average particle size is 100-200 nm, uniformly mixing with the sintering material prepared in the step 2), granulating by a spray drying tower, drying until the water content of the granules is 0.7-2.5wt%, and sieving by a 60-80 mesh sieve;

4) pressing and molding the granules sieved in the step 3) under the molding pressure of 0.8-3.5T/cm²(ii) a Then adding the mixture into a sintering furnace for sintering at the sintering temperature of 1400 ℃ and 1600 ℃, preserving the heat for 0.5-5h, cooling and polishing to obtain the boron carbide-based metal ceramic composite material.

Preferably, the weight ratio of cobalt to nickel in the cobalt-nickel alloy is as follows: 1:(1.5-5).

The invention has the beneficial effects that: firstly, mixing boron carbide and chromium carbide, ball-milling until the average grain diameter is 10-50um, granulating, sintering and carrying out secondary ball-milling to obtain a sintered material; then mixing, ball-milling, sieving, press-forming and sintering the zirconium oxide, yttrium oxide and cobalt-nickel alloy with the prepared sintering material, effectively avoiding the influence of alloy raw materials on the embedding and the formation of the crystal boundary of boron carbide and chromium carbide, improving the crystal boundary performance, simultaneously enabling the boron carbide to take the chromium carbide as a middle link, greatly improving the affinity between the boron carbide and the zirconium oxide, yttrium oxide and cobalt-nickel alloy, and improving the crystal boundary performance of the whole boron carbide-based metal ceramic composite material, thereby enabling the boron carbide-based metal ceramic composite material to have good isotropy, uniform structure, high-temperature creep resistance and high toughness.

The addition of second phase ductile particles to brittle ceramic matrix materials can significantly improve the fracture toughness of the material by strengthening mechanisms including crack tip shielding based on the plastic deformation zone formed by the crack tip, and ductile crack bridges formed by the ductile particles. The metal ceramic belongs to a ductile particle toughening mode, is a material between high-temperature alloy and ceramic, and has the characteristics of high toughness and plasticity of metal, high melting point of ceramic, corrosion resistance, wear resistance and the like, so that the metal ceramic has the advantages of good isotropy, structural uniformity, oxidation resistance and high-temperature creep resistance, and meanwhile, the strength, the toughness, the thermal conductivity and the like.

Detailed Description

The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples.

Comparative example

The preparation method comprises the following steps:

1) weighing the following raw materials in parts by weight: 90 parts of boron carbide, 3 parts of zirconium oxide, 2 parts of yttrium oxide, 2 parts of chromium carbide and 3 parts of cobalt-nickel alloy; the weight ratio of cobalt to nickel in the cobalt-nickel alloy is as follows: 1:3.

2) Adding the raw materials into a ball mill, ball-milling until the average particle size is 200 nm, uniformly mixing, granulating by a spray drying tower, drying until the water content of granules is 0.7-2.5wt%, and sieving by a 60-mesh sieve;

4) pressing and molding the granules sieved in the step 3) at the molding pressure of 2T/cm²(ii) a And then adding the mixture into a sintering furnace for sintering, wherein the sintering temperature is 1600 ℃, preserving the heat for 1h, cooling and polishing to obtain the boron carbide-based metal ceramic composite material.