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Multivariate gradient self-lubricating ceramic cutting tool material with surface having residual compressive stress and preparation method of multivariate gradient self-lubricating ceramic cutting tool material

A ceramic tool, gradient technology, applied in the field of ceramic tool materials, can solve the problem of difficult component design and other problems

Inactive Publication Date: 2012-12-12
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing gradient composition distribution functions are mostly used in the composition design of binary functionally graded materials because only one composition distribution index is used.
It will encounter difficulties in the design of multi-component gradient self-lubricating ceramic tool materials with more than 2 components, which makes the component design difficult to carry out

Method used

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  • Multivariate gradient self-lubricating ceramic cutting tool material with surface having residual compressive stress and preparation method of multivariate gradient self-lubricating ceramic cutting tool material
  • Multivariate gradient self-lubricating ceramic cutting tool material with surface having residual compressive stress and preparation method of multivariate gradient self-lubricating ceramic cutting tool material
  • Multivariate gradient self-lubricating ceramic cutting tool material with surface having residual compressive stress and preparation method of multivariate gradient self-lubricating ceramic cutting tool material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Embodiment 1: take n 1 =n 2 ≠0 distribution index type, take n 1 =n 2 =2.0.

[0085] The multi-component gradient self-lubricating ceramic tool material in this example has a 7-layer structure, and the volume percentage and thickness of the components of each layer are listed in Table 1.

[0086] Table 1. The component volume percentage and thickness of each layer of the multi-component gradient self-lubricating ceramic tool material of embodiment 1

[0087]

[0088] Prepare each group of mixed powder according to the following steps:

[0089] Weigh α-Al in proportion 2 o 3 powder, (W,Ti)C powder and CaF 2 Powder (L4 layer mixed powder does not weigh CaF 2 powder), respectively add absolute ethanol to make a suspension, fully stir, and ultrasonically disperse for 20 minutes; mix the suspensions of the above-mentioned raw materials to obtain a multi-phase suspension, and then add sintering aids MgO and NiO in proportion (the volume ratio of the two 1:1), ultr...

Embodiment 2

[0096] Embodiment 2: take n 1 ≠n 2 ≠0 distribution index type.

[0097] take n 1 =1, n 2 =3.5. The multi-component gradient self-lubricating ceramic cutting tool material in this embodiment has a 9-layer structure, and the volume percentage and thickness of the components of each layer are listed in Table 3.

[0098] Table 3. The component volume percentage and thickness of each layer of the multi-component gradient self-lubricating ceramic tool material of embodiment 2

[0099]

[0100] Prepare each group of mixed powders according to the following steps: Weigh α-Al 2 o 3 powder, (W,Ti)C powder and CaF 2 Powder (L5 layer mixed powder does not weigh CaF 2 powder), respectively add absolute ethanol to make a suspension, fully stir, and ultrasonically disperse for 30 minutes; mix the suspensions of the above-mentioned raw materials to obtain a multi-phase suspension, and then add sintering aids MgO and NiO in proportion (the volume ratio of the two 1:1), ultrasonical...

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Abstract

The invention relates to a multivariate gradient self-lubricating ceramic cutting tool material with a surface having residual compressive stress and a preparation method of the multivariate gradient self-lubricating ceramic cutting tool material. The multivariate gradient self-lubricating ceramic cutting tool material subjected to composition gradient design by applying a multivariate gradient composition distribution function, and is formed by being subjected to layered paving and hot pressed sintering by taking alpha-Al2O3 as a basal body, adding (W, Ti) as wild phase, taking calcium fluoride as a solid lubricant and taking magnesium oxide and nickel oxide as sintering aids. The cutting tool material has (2K-1) layers of gradient structures components of which are symmetrical relative to a middle layer. The highest 8-12% of calcium fluoride content on the surface layer is reduced to be zero of the calcium fluoride content on the middle layer. The residual compressive stress exists between two surface layers of the cutting tool material. Various mechanical performance indexes of the ceramic cutting tool material are all higher than those of homogeneous self-lubricating ceramic cutting tool materials with the same material system, and the multivariate gradient self-lubricating ceramic cutting tool material has high antifriction and high friction-resistant properties at the same time and can be used for dry cutting and cutting processing of materials difficult to process.

Description

technical field [0001] The invention relates to a multi-element gradient self-lubricating ceramic cutter material based on surface residual compressive stress and a preparation method thereof, belonging to the technical field of ceramic cutter materials. Background technique [0002] Self-lubricating ceramic tools are made by adding solid lubricants into the matrix of ceramic tools. Using the characteristics of low friction coefficient of solid lubricants, ceramic tools form a continuous solid lubricating film on the tool surface during cutting, so as to realize the self-lubrication of the tool itself. Self-lubricating function, see Cao Tongkun, Design and Development of Self-lubricating Ceramic Cutting Tool and Research on Self-lubricating Mechanism, Doctoral Dissertation of Shandong University, 2005. On the one hand, the added solid lubricant can be precipitated from the friction surface and dragged to form a solid lubricating film, which improves the contact state of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/56C04B35/622
Inventor 许崇海吴光永肖光春方斌
Owner QILU UNIV OF TECH
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