Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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Preparation method of high-strength and high-toughness non-binding phase nanocrystalline hard alloy
The invention discloses a preparation method of a high-strength high-toughness non-binding-phase nanocrystalline hard alloy, and belongs to the technical field of hard alloy materials. A tungsten source, an oxidizing agent, metal nitrate, organic fuel and a soluble organic carbon source are prepared into a mixed solution according to a certain proportion, and then nano tungsten oxide/other metal oxide/carbon composite precursor powder is prepared through a solution combustion synthesis method; and then the precursor powder is put into a mold to be pre-pressed and then is directly put into a spark plasma sintering furnace to be subjected to reduction carbonization and rapid sintering reaction in a vacuum environment, and thereby the unbonded phase nanocrystalline hard alloy added with the metal oxide is obtained. The prepared binding-phase-free nanocrystalline hard alloy is small in grain size (100-200 nm), good in compactness (the relative density is larger than or equal to 98.5%), high in hardness (2420-2895 kg/mm2), fracture toughness (12.6-15.8 MPa.m<1/2>) and strength (1335-1527 Mpa) and good in comprehensive performance. The method is low in raw material cost, simplifies the technological process, shortens the production period, reduces the production cost and is simple in preparation operation.
一种高强韧无粘结相纳米晶硬质合金的制备方法，属于硬质合金材料技术领域。将钨源、氧化剂、金属硝酸盐、有机燃料和可溶性有机碳源按照一定配比配制成混合溶液后，通过溶液燃烧合成法制得纳米氧化钨/其他金属氧化物/碳复合前驱体粉末，再将前驱体粉末装入模具进行预压后直接置于放电等离子烧结炉中真空环境下进行还原‑碳化和快速烧结反应，获得添加金属氧化物的无粘结相纳米晶硬质合金。本发明制备的无粘结相纳米晶硬质合金晶粒尺寸细小(100～200nm)、致密性好(相对密度≥98.5％)，还具有较高的硬度(2420～2895kg/mm2)、断裂韧性(12.6～15.8MPa·m1/2)和强度(1335～1527Mpa)，综合性能佳。本发明原料成本低、简化了工艺流程、缩短了生产周期、降低了生产成本，制备操作简单。
Preparation method of high-strength and high-toughness non-binding phase nanocrystalline hard alloy
The invention discloses a preparation method of a high-strength high-toughness non-binding-phase nanocrystalline hard alloy, and belongs to the technical field of hard alloy materials. A tungsten source, an oxidizing agent, metal nitrate, organic fuel and a soluble organic carbon source are prepared into a mixed solution according to a certain proportion, and then nano tungsten oxide/other metal oxide/carbon composite precursor powder is prepared through a solution combustion synthesis method; and then the precursor powder is put into a mold to be pre-pressed and then is directly put into a spark plasma sintering furnace to be subjected to reduction carbonization and rapid sintering reaction in a vacuum environment, and thereby the unbonded phase nanocrystalline hard alloy added with the metal oxide is obtained. The prepared binding-phase-free nanocrystalline hard alloy is small in grain size (100-200 nm), good in compactness (the relative density is larger than or equal to 98.5%), high in hardness (2420-2895 kg/mm2), fracture toughness (12.6-15.8 MPa.m<1/2>) and strength (1335-1527 Mpa) and good in comprehensive performance. The method is low in raw material cost, simplifies the technological process, shortens the production period, reduces the production cost and is simple in preparation operation.
一种高强韧无粘结相纳米晶硬质合金的制备方法，属于硬质合金材料技术领域。将钨源、氧化剂、金属硝酸盐、有机燃料和可溶性有机碳源按照一定配比配制成混合溶液后，通过溶液燃烧合成法制得纳米氧化钨/其他金属氧化物/碳复合前驱体粉末，再将前驱体粉末装入模具进行预压后直接置于放电等离子烧结炉中真空环境下进行还原‑碳化和快速烧结反应，获得添加金属氧化物的无粘结相纳米晶硬质合金。本发明制备的无粘结相纳米晶硬质合金晶粒尺寸细小(100～200nm)、致密性好(相对密度≥98.5％)，还具有较高的硬度(2420～2895kg/mm2)、断裂韧性(12.6～15.8MPa·m1/2)和强度(1335～1527Mpa)，综合性能佳。本发明原料成本低、简化了工艺流程、缩短了生产周期、降低了生产成本，制备操作简单。
Preparation method of high-strength and high-toughness non-binding phase nanocrystalline hard alloy
一种高强韧无粘结相纳米晶硬质合金的制备方法
QIN MINGLI (Autor:in) / WU HAOYANG (Autor:in) / WANG QIANYU (Autor:in) / JIA BAORUI (Autor:in) / QU XUANHUI (Autor:in)
22.01.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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