SiC whisker synergistic silicon nitride particle toughened alumina-based ceramic cutter material and preparation process thereof

A tool material and preparation technology, applied in the field of new materials, can solve the problems of reducing the service performance of ceramic tools, alloy tools are incomparably huge, and are prone to brittle damage, and achieve superior comprehensive performance, excellent high-temperature mechanical properties, and high processing matching sexual effect

Active Publication Date: 2020-02-21
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes different ways to make ceramics that have better performance at both high temperatures (up to 2000° C.) or when subjected to severe forces during machining processes like milling. By combining specific phases together, these tools are more durable than traditional methods involving pure metals due to their improved strength against abrasion damage compared to other types of alloys used alone. Additionally, this method allows for precise control over the size distribution of particles throughout the body without adding any foreign substances into the final product. Overall, this new approach simplifies manufacturing processes while maintaining good overall characteristics of the resulting products.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving the durability and precision of cerarnery tooling made from advanced material for applications like aircraft engine components while also being able to handle challengingly shaped materials with improved wear characteristics without causing excessive heat generation leading to rapid failures.

Method used

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  • SiC whisker synergistic silicon nitride particle toughened alumina-based ceramic cutter material and preparation process thereof
  • SiC whisker synergistic silicon nitride particle toughened alumina-based ceramic cutter material and preparation process thereof
  • SiC whisker synergistic silicon nitride particle toughened alumina-based ceramic cutter material and preparation process thereof

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Experimental program
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Embodiment 1

[0048] SiC whiskers synergistically with Si 3 N 4 Particle toughened Al 2 o 3 Base ceramic cutting tool material and its preparation process, the main steps are as follows:

[0049] (1) Weighing: Weigh 62.5% Al according to the volume fraction 2 o 3 powder, 20% SiC w Powder, 15% Si 3 N 4 Powder, 1.5% Y 2 o 3 powder, 1% CeO 2 and La 2 o 3 Mixed powder (CeO 2 Powder and La 2 o 3 Powder volume ratio is 1:1).

[0050] (2) Dispersion: 297mL of ethanol (99vol%), 3mL of distilled water (1vol%) and 0.2g of PEG2000 were prepared into a dispersion liquid, and the dispersion liquid was adjusted to an alkaline environment (pH=9) with ammonia water, and magnetically stirred for 3 hours. SiC w Powder, Y 2 o 3 Powder, CeO 2 and La 2 o 3 The mixed powder was added into the dispersion liquid, and dispersed for 2 hours with an ultrasonic cleaner and a mixer to form a uniform slurry.

[0051] (3) Ball milling: the Al obtained after slurry and ball milling for 72 hours 2 o...

Embodiment 2

[0057] This embodiment is the same as Embodiment 1, except that the final temperature of vacuum hot pressing sintering is 1550°C.

Embodiment 3

[0059] This embodiment is the same as Embodiment 1, except that the final temperature of vacuum hot pressing sintering is 1600°C.

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Abstract

The invention provides a SiC whisker synergistic silicon nitride particle toughened alumina-based ceramic cutter material and a preparation process thereof. The preparation method comprises the following steps: preparing SiC whiskers and a sintering aid into slurry, uniformly mixing the slurry with Al2O3 and Si3N4, drying to obtain composite ceramic powder, pre-pressing the composite ceramic powder into a green body, and carrying out vacuum hot-pressing sintering on the green body to obtain the alumina-based ceramic cutter material, wherein the heating process of the vacuum hot pressing sintering comprises the following steps: heating to 190-210 DEG C at a first heating rate, keeping the temperature, heating to 1350-1450 DEG C at a second heating rate, keeping the temperature, heating to 1500-1650 DEG C at a third heating rate, and keeping the temperature; in the heating process of vacuum hot-pressing sintering, the green body is firstly kept pre-pressed, when the temperature rises to1050-1150 DEG C, the pressure of the green body is started to be increased and kept, and when the temperature continues to rise from 1350-1450 DEG C, the pressure of the green body continues to be increased until the temperature rising is ended, and the pressure is kept.

Description

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Claims

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Application Information

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Owner SHANDONG UNIV
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