Method for preparing layered ceramic tool based on shock wave conduction theory

A ceramic cutting tool and shock wave technology, applied in the field of layered ceramic cutting tool preparation based on shock wave conduction theory, can solve problems such as collapse, and achieve the effects of small friction factor, good comprehensive mechanical properties, and high wear resistance

Active Publication Date: 2018-01-16
LUDONG UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Small cracks induced by the shock wave lead to larger cracks and eventually the whole structure collapses under the ensuing dynamic pressure

Method used

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  • Method for preparing layered ceramic tool based on shock wave conduction theory

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Embodiment 1

[0016] Example 1: According to Al 2 O 3 80%, TiB 2 The mass ratio of 19% to MgO 1% is weighed as the micro-laminated material (1), Al 2 O 3 The mass ratio of 35% and WC-Co 65% is used to weigh the material of the base layer (2); the weighed mixed powders are respectively milled with deionized water as the medium and alumina as the grinding ball by planetary intensified ball milling for 150 h. Dry in a vacuum drying oven and pass the mixed powder through a 200-mesh sieve. Calculate the mass of each base layer (2) and the micro-laminated layer (1) according to the mixed theoretical density, layer thickness, and inner diameter of the graphite mold of the micro-laminated layer (1) and the base layer (2), and use a powder press Press the base layer (2) and the micro-laminated layer (1) into pieces, according to figure 1 The stacking sequence shown is placed in a graphite mold for hot-press sintering in vacuum, the number of layers is 21; the sintering temperature is 1650℃, the sinte...

Embodiment 2

[0017] Embodiment 2: Others are the same as embodiment 1, the difference is that according to Al 2 O 3 78%, TiB 2 The mass ratio of 20% to MgO2% is weighed as the micro-laminated material (1), Al 2 O 3 The mass ratio of 40% and WC-Co 60% is used to weigh the material of the base layer (2); the sintering temperature is 1620℃, the sintering pressure is 35MPa, and the sintering holding time is 25min; the vickers hardness of the sintered layered ceramic tool material is 18.8~19.7GPa, Frontal equivalent bending strength 850~970MPa, fracture toughness 7.8~8.2MPa·m 1 / 2 .

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Abstract

The present invention belongs to the technical field of cutting tools, and in particular relates to a method for preparing a layered ceramic tool based on a shock wave conduction theory. The tool is prepared from raw materials of alumina, titanium boride, tungsten carbide cobalt and magnesium oxide. The method is characterized in that a micro-laminated layer comprises 78-83% of Al2O3 + 15-20% of TiB2 + 1-2% of MgO, and has a thickness of 100mu m, a matrix layer comprises 30-40% of Al2O3 + 60-70% of WC-Co, and has a thickness of 500mu m, the raw materials are weighed according to the ratio of 78-83% of Al2O3 + 15-20% of TiB2 + 1-2% of MgO of the micro-laminated layer and 30-40% of Al2O3 + 60-70% of WC-Co of the matrix layer by mass by use of an electronic scale, deionized water as a mediumand the alumina as grinding balls are used for planetary intensive ball milling for 150-200h, and the mixture is dried under vacuum, and sieved with a 200-mesh sieve. The mass of each matrix layer andthe mass of each micro-laminated layer can be calculated according to the mixed theoretical density and thickness of the micro-laminated layer and the matrix layer and the inner diameter of a graphite mould, a powder pressing machine is used for pressing the micro-laminated layer and the matrix layer, the micro-laminated layers and the matrix layers are placed in the graphite mould in turn (the number of the layers is 21), a vacuum hot pressing sintering process is used, temperature is 1600-1700 DEG C, pressure is 28-35MPa, and holding time is 25-30min. The layered ceramic tool prepared by the method can be widely used in the processing of difficult-to-process materials such as austenitic stainless steel, cold working die steel, martensitic stainless steel and so on.

Description

Technical field [0001] The invention belongs to the technical field of mechanical cutting tool manufacturing, and particularly relates to a method for preparing a layered ceramic tool based on shock wave conduction theory. Background technique [0002] Ceramic tools play an important role in dry cutting tool technology. A lot of manpower and funds have been invested at home and abroad to solve the inevitable defects of ceramic tools (low strength, low toughness, poor thermal shock resistance, high-speed cutting, especially interrupted cutting It is easy to chip and other problems). From the initial addition of particles, whiskers, fibers, nanotubes and other toughening and reinforcing phases to the ceramic matrix material to the use of Multilayered Coatings, gradient function + self-lubricating (Graded Self-lubricating), micro texture (Microscale Texture) and Biomimetic laminate (Biomimetic laminate) and other new technologies, so that the development of ceramic tools to a new l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/56C04B35/622
Inventor 刘长霞孙军龙张凤明
Owner LUDONG UNIVERSITY
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