Preparation process for integrated enhancing hardness and breaking toughness of omposite material with MoSi2 base by addiing multi-element

A composite material and fracture toughness technology, which is applied in the field of preparation of MoSi2-based composite materials, can solve problems such as increased cost and complicated process, and achieve the effect of increasing the value of fracture toughness, hardness and fracture toughness

Inactive Publication Date: 2006-11-08
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of this preparation method is still relatively complicated, and high-quality aluminosilicate should be selected as the binder in the molding and drying process, thus greatly increasing the cost in the preparation process.

Method used

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  • Preparation process for integrated enhancing hardness and breaking toughness of omposite material with MoSi2 base by addiing multi-element
  • Preparation process for integrated enhancing hardness and breaking toughness of omposite material with MoSi2 base by addiing multi-element
  • Preparation process for integrated enhancing hardness and breaking toughness of omposite material with MoSi2 base by addiing multi-element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Select 400 mesh Mo powder and Si powder and add 200 mesh 10mol.% W and 0.2wt.% La two element powders for mixing at the same time, and alloy them under the action of ball milling in a high-energy ball mill to make them in situ Formation of solid solution WSi 2 and the dispersed second phase particles La 2 o 3 , and then sieved to 200 meshes, press the synthesized composite material powder into shape, the pressure is 100Mpa, hold the pressure for 2 minutes; put the green compact into the sintering furnace and sinter at 1600°C under the hydrogen atmosphere, keep it warm for 2 hours, and cool down with the furnace to obtain Product, the product is silver gray solid.

Embodiment 2

[0015] Example 2: Select 200 mesh Mo powder and Si powder and add 400 mesh 15mol.% W and 0.5wt.% La two element powders to mix at the same time, use tungsten wire to ignite under vacuum in a high temperature self-propagating device, resulting in self The propagation reaction occurs, and the synthesized composite material powder is hot-pressed. The hot-pressing temperature is 1700°C, the holding time is 1 hour, and the applied pressure is 25Mpa. The product is silver gray solid.

Embodiment 3

[0016] Example 3: Select 300 mesh Mo powder and Si powder and add 300 mesh 20mol.% W and 2.0wt.% La two element powders to mix at the same time, use tungsten wire to ignite under vacuum in a high temperature self-propagating device, resulting in self Propagation reaction occurs, the synthetic composite material powder is compacted, the pressure is 500Mpa, and the pressure is kept for 1 minute; the compact is placed in a sintering furnace and sintered at 1800°C under a hydrogen atmosphere, kept for 1 hour, and cooled with the furnace to obtain the product. It is silver-gray solid.

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Abstract

The invention discloses a method for comprehensively improving MoSi by adding various elements. 2 The preparation method of hardness and fracture toughness of matrix composite material, this method is in MoSi 2 During mechanical alloying or high-temperature self-propagating synthesis process, various elements such as W and La are simultaneously introduced to generate solid solution and dispersed second-phase particles in situ, and obtain a structure with an average grain size of <1 μm. Using particle strengthening and solid solution Strengthening, fine-grain toughening, crack deflection and bridging and other strengthening and toughening mechanisms, the pure MoSi 2 The combined form of fine-grain intergranular fracture and coarse-grain transgranular fracture is transformed into transgranular fracture, which solves the problem of MoSi 2 The difficulty of improving the room temperature fracture toughness of matrix composites is limited, thus comprehensively improving the MoSi 2 The hardness and fracture toughness of the invention can be greatly improved, especially the fracture toughness value can be increased by 89.36-178.26%.

Description

technical field [0001] The present invention relates to a kind of MoSi 2 (Molybdenum disilicide)-based composite material preparation method, in particular to a comprehensive improvement of MoSi by adding a variety of elements 2 Preparation methods for hardness and fracture toughness of matrix composites. Background technique [0002] Currently, due to MoSi 2 The intermetallic compound with its characteristic C 11b type crystal structure, leading to the inherent defect of low room temperature fracture toughness. Existing methods are in MoSi 2 Add a single tough element such as Nb to the matrix, or introduce high melting point, high elastic modulus second phase particles or fibers such as SiC, ZrO 2 , C, TiC, Al 2 o 3 、WSi 2 、Mo 5 Si 3 etc., in order to achieve the purpose of improving the toughness, but the above method has no effect on MoSi 2 The improvement of room temperature fracture toughness is limited, and the general fracture toughness value is only 6-8.5M...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/18C22C1/05C04B35/58
Inventor 张厚安陈平唐果宁龙春光李颂文
Owner HUNAN UNIV OF SCI & TECH
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