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
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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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