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Nanometer aluminum oxide reinforced 316L stainless steel composite material and preparation method thereof

A technology of nano-alumina and composite materials, which is applied in the field of nano-alumina reinforced 316L stainless steel composite materials and its preparation, which can solve the problems of powder being easily polluted, difficult to prepare cleanliness, and low production efficiency.

Inactive Publication Date: 2021-08-03
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity of the powder metallurgy process, involving multiple steps such as mechanical alloying, degassing, hot extrusion, and heat treatment, there are many control links, and the reproducibility of the process and products is poor. It is difficult to prepare powders with the same cleanliness, structure and performance. steel to
At the same time, during the mechanical alloying process, the powder is easily polluted, which has high requirements on the working atmosphere, and the mechanical alloying time is more than 50 hours, and the production efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example nano-alumina reinforced 316L stainless steel composite material, nano-scale Al 2 o 3 Accounting for 0.1% of the total mass of composite materials. Nanoscale Al 2 o 3 The particle size is 2 ~ 10nm, the number is 10 22 ~10 23 piece / m 3 , The distance between particles is 300~350nm. The density of the nano-alumina reinforced 316L stainless steel composite material of the present invention is 7.975g / cm 3 , Density above 99%.

[0041] The preparation process of the present embodiment nano-alumina reinforced 316L stainless steel composite material comprises the following steps:

[0042] (1)Al 2 o 3 Powder pretreatment: Spherical Al with a size smaller than 15nm 2 o 3 Placed in 0.3mol / ml NH 4 Erosion treatment in OH. After erosion, wash with clean water and dry. During etching treatment, spherical Al 2 o 3 The mass of NH 4 The volume ratio of OH is: 15g (Al 2 o 3 ): 200ml (NH 4 OH), the erosion time is 25min, the drying temperature is 100℃,...

Embodiment 2

[0048] In this example nano-alumina reinforced 316L stainless steel composite material, nano-scale Al 2 o 3 Accounting for 0.15% of the total mass of the composite material. Nanoscale Al 2 o 3 The particle size is 2-10nm, and the number is 0.6×10 23 ~4×10 23 piece / m 3 , The distance between particles is 100-500nm. The density of the nano-alumina reinforced 316L stainless steel composite material of the present invention is 7.97g / cm 3, Density above 99%.

[0049] The preparation process of the present embodiment nano-alumina reinforced 316L stainless steel composite material comprises the following steps:

[0050] (1)Al 2 o 3 Powder pretreatment: Spherical Al with a size smaller than 15nm 2 o 3 placed in 0.2mol / ml NH 4 Erosion treatment in OH. After erosion, wash with clean water and dry. During etching treatment, spherical Al 2 o 3 The mass of NH 4 The volume ratio of OH is: 10g (Al 2 o 3 ): 200ml (NH 4 OH), the erosion time is 30min, the drying temperatur...

Embodiment 3

[0056] In this example nano-alumina reinforced 316L stainless steel composite material, nano-scale Al 2 o 3 Accounting for 0.2% of the total mass of the composite material. Nanoscale Al 2 o 3 The particle size is 2 ~ 10nm, the number is 10 23 ~10 24 piece / m 3 , The distance between particles is 100-500nm. The density of the nano-alumina reinforced 316L stainless steel composite material of the present invention is 7.98g / cm 3 , Density above 99%.

[0057] The preparation process of the present embodiment nano-alumina reinforced 316L stainless steel composite material comprises the following steps:

[0058] (1)Al 2 o 3 Powder pretreatment: Spherical Al with a size smaller than 15nm 2 o 3 placed in 0.5mol / ml NH 4 Erosion treatment in OH. After erosion, wash with clean water and dry. During etching treatment, spherical Al 2 o 3 The mass of NH 4 The volume ratio of OH is: 14g (Al 2 o 3 ): 200ml (NH 4 OH), the erosion time is 20min, the drying temperature is 130...

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Abstract

The invention discloses a nanometer aluminum oxide reinforced 316L stainless steel composite material and a preparation method thereof. The preparation method comprises the following steps that mixed powder A is subjected to powder laying and laser forming, and a formed body is obtained; stress regulation and control are carried out on the formed body, and the nanometer aluminum oxide reinforced 316L stainless steel composite material is obtained; the mixed powder A is a mixed powder obtained by ball-milling 316L steel powder and pretreated Al2O3 powder together; and the pretreatment process of the Al2O3 powder comprises the steps that spherical Al2O3 is placed in NH4OH to be subjected to erosion treatment, washing and drying are carried out after erosion, and the pretreated Al2O3 powder is obtained. The nanometer aluminum oxide reinforced 316L stainless steel composite material contains 0.1%-0.2% of nanoscale Al2O3 particles and the balance a 316L matrix. According to the method, the nanometer aluminum oxide reinforced 316L stainless steel composite material is prepared through the laser melting technology, the method has the characteristics of being high in machining speed, high in efficiency and short in working procedure, meanwhile, the ceramic material Al2O3 can be evenly distributed in a 316L stainless steel matrix, the strength of 316L is remarkably improved, and the method has important significance for expanding the applicability of 316L.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a nano-alumina-reinforced 316L stainless steel composite material and a preparation method thereof. Background technique [0002] Austenitic 316L stainless steel is an excellent industrial material with excellent corrosion resistance, toughness and biocompatibility, and is widely used in engineering, biomedicine and other fields. However, the lower strength of 316L limits its high-performance applicability. In the steel matrix, introducing ceramic particles to form a steel matrix composite material can solve the above problems and improve the performance and applicability of the steel. However, since 316L contains 16%-18% Cr and 10%-14% Ni, the ceramic particles are difficult to be wetted by the 316L matrix, resulting in uneven distribution of ceramic particles. [0003] At present, the powder metallurgy process is often used to introduce ceramic phases into...

Claims

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Application Information

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IPC IPC(8): C22C33/02B22F10/28B22F9/04C01F7/02B33Y70/10B33Y10/00
CPCC22C32/0026C22C33/0228B22F9/04C01F7/021B33Y70/10B33Y10/00B22F2009/043
Inventor 邱国兴李小明韦旭立白冲贺芸李林波梁李斯
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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