Methods for preparing multiphase high-strength highly-wear-resistant silicon nitride ceramic cutting tool material and tool

A technology of silicon nitride ceramics and cutting tool materials, which is applied in the accessories of tool holders, cutting tools for lathes, turning equipment, etc., and can solve the problems of the impact of material compactness and insufficient wear resistance of products

Inactive Publication Date: 2014-06-25
广州腾亚工艺品有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese patent CN101538161 discloses the application of a silicon nitride ceramic material in the preparation of ceramic bearing balls, adopts the method of atmosphere sintering, and uses a variety of rare earth oxide sintering aids to produce a silicon nitrid

Method used

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  • Methods for preparing multiphase high-strength highly-wear-resistant silicon nitride ceramic cutting tool material and tool
  • Methods for preparing multiphase high-strength highly-wear-resistant silicon nitride ceramic cutting tool material and tool
  • Methods for preparing multiphase high-strength highly-wear-resistant silicon nitride ceramic cutting tool material and tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The weight percentage (hereinafter referred to as wt%) is 89% α-Si3N4 powder, 1% is β-Si 3 N 4 Seed crystals and 8% of different rare earth oxide sintering aids, and different weight percentages of sub-densification aids (see Table 1 for details), mix the mixed powder with alcohol, ball mill for 48-80 hours, and dry , through a 100-mesh sieve, and then put it into a graphite grinding tool, under the pressure of 10-15MPa in a hot-pressed sintering furnace, 2 Warm up to 1750-1800°C for 20-40min, anneal at 1350°C for 1 hour, cool down to room temperature and process into required test samples, mirror polish, measure strength and hardness, and obtain sample results (see Table 2 for details).

[0037] Table 1

[0038]

[0039] Table 2

[0040]

Embodiment 2

[0042] Different weight percentages of α-Si 3 N 4 Powder, 1% β-Si 3 N 4 Seed crystals are mixed with different weight percentages of rare earth metal oxide sintering aids and corresponding weight percentages of sub-densification aids (see Table 3 for details), ball milled, dried, sieved, put into graphite grinding tools, and heated Under the pressure of 10-15MPa in the pressure sintering furnace, under N 2 Warm up to 1750-1800°C for 30-60min, then anneal at 1350°C for 1 hour, cool down to room temperature and process into required test samples, mirror polished, and measure strength and hardness (see Table 4 for details).

[0043] table 3

[0044]

[0045] Table 4

[0046]

Embodiment 3

[0048] The powders of samples 1, 5, 2A, and 3A were ball-milled, dried, sieved, and put into graphite grinding tools. 2 Rapidly raise the temperature to 1400°C-1450°C for 1min, then raise the temperature to 1750-1800°C for 20-40min, anneal at 1350°C for 1h, cool down to room temperature and process into required test samples, mirror polished, measure strength and hardness , (see Table 5 for details).

[0049] table 5

[0050]

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Abstract

The invention discloses a method for preparing a multiphase high-strength highly-wear-resistant silicon nitride ceramic cutting tool material for processing cast iron and alloys as well as a method for preparing a ceramic tool made of the material. According to the method, alpha-sialon is grown in situ, the intergranular phase is reduced, the ceramic material is reinforced and toughened, and the obtained material has the bending strength of 900-1000MPa at room temperature, the breaking tenacity of 8-10MPa/m<2> and the hardness of 92-94.5HRA. Moreover, the ceramic material is processed into a tool by adopting the method, when the speed is 600m/in and the cutting length is 1000meters in the process of cutting nodular cast iron QT450-10, the flank wear is less than 0.4mm, and the cutting level of the tool is higher than that of a commercial tool in the conventional market.

Description

technical field [0001] The invention relates to a preparation method of silicon nitride ceramic cutting tool material, a multiphase high-strength and high wear-resistance material for processing cast iron and alloy cutting tools and a preparation method of the cutting tool. Background technique [0002] In recent years, silicon nitride ceramic cutting tools have been widely used in the field of modern processing due to their high hardness, strength, fracture toughness, small expansion coefficient, high temperature resistance and inexhaustible elements such as silicon and nitrogen in nature. However, with the continuous improvement of modern processing technology requirements, the requirements for the performance of corresponding materials are also rising, and the division of labor for materials due to their performance differences is becoming more and more refined. According to the performance of processed products, the matching ceramic tool materials are used. , can not onl...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/622B23B27/00
Inventor 王也
Owner 广州腾亚工艺品有限公司
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