CN104402454A - Heat-resistant ceramic for cutting tools and preparation method thereof - Google Patents

Abstract

The invention relates to a heat-resistant ceramic for cutting tools. The heat-resistant ceramic for cutting tools is prepared from the following raw materials by weight part: 15-20 of Al2O3, 18-22 of CaO, 20-24 of zirconia, 30-35 of silicon nitride, 25-30 of boron nitride, 9-12 of black silicon carbide, 2-3 of zirconium phosphate, 3-4 of magnesium oxide, 1-1.3 of polyethylene glycol, a proper amount of ethanol, 1-1.3 of potassium humate, a proper amount of deionized water, 1.7-2 of polyethylene glycol, and 3-4 of a wear resistant additive. The ceramic provided by the invention has good wear resistance, by adding black silicon carbide, zirconium phosphate and magnesium oxide, the wear resistance and thermal conductivity of the ceramic are greatly increased, the service life of cutting tools can be prolonged, and the cost of the ceramic is low. Through use of the wear resistant additive provided by the invention, the surface smoothness, wear resistance and heat resistance of the ceramic can be increased.

Description

A kind of cutting tool heat-stable ceramic and preparation method thereof

Technical field

The present invention relates to ceramic cutting tool material field, particularly relate to a kind of cutting tool heat-stable ceramic and preparation method thereof.

Background technology

Along with the development of new and high technology, mechanical industry proposes the more strict and requirement of harshness to cutter material, the higher material of workhardness, stock-removing efficiency that needs are higher, working accuracy is needed now also to require high, this just requires the performance improving cutter, the cutting material hardness such as traditional rapid steel are inadequate, and waste the resources such as rare molybdenum, nickel, therefore sintex arises at the historic moment.Ceramic cutting-tool has possessed high rigidity, high-density, high temperature resistant, the features such as diamagneticization, anti-oxidant, erosion resistance is strong, chemical stability is good, high-wearing feature, but still there is the shortcomings such as frangible, poor radiation, heat-shock resistance are poor, abrasion resistance is limited, need to improve, need constantly to reduce production cost simultaneously, realize enterprise's maximum benefit, promote scientific-technical progress.

Summary of the invention

The object of the present invention is to provide a kind of cutting tool heat-stable ceramic and preparation method thereof, this ceramic abrasive resistance is good, by adding black silicon carbide, zirconium phosphate, magnesium oxide, considerably increases wear resistance, the thermal conductivity of pottery, extend cutting-tool's used life, this ceramic cost is low.

Technical scheme of the present invention is as follows:

A kind of cutting tool heat-stable ceramic, is characterized in that being made up of the raw material of following weight part: Al2O3 15-20, CaO18-22, zirconium white 20-24, silicon nitride 30-35, boron nitride 25-30, black silicon carbide 9-12, zirconium phosphate 2-3, magnesium oxide 3-4, polyoxyethylene glycol 1-1.3, appropriate amount of ethanol, potassium humate 1-1.3, deionized water are appropriate, polyoxyethylene glycol 1.7-2, antiwear assistant 3-4;

Described antiwear assistant is made up of the raw material of following weight part: silicon nitride 1-1.4, aluminium nitride 1-1.4, titanium nitride 1-1.3, carbonitride 0.4-0.7, zirconium white 1-2, bortz powder 1-2, hafnia 0.3-0.4, silane coupling agent kh-550 1-2, nitrogenize silver 0.7-0.9, silicon carbide 1-2, polyacrylic ester 0.4-0.6, ethanol 6-9, water 7-11; Preparation method is: ethanol, polyacrylic ester, silane coupling agent kh-550 are added to the water, stir, then add zirconium white, silicon carbide, be heated to 70-80 DEG C, stirring reaction 20-30 minute, then add other remaining components, stir 10-20 minute, ultrasonic disperse 6-8 minute, filter, dry, pulverize, cross 40 mesh sieves, under nitrogen atmosphere, at 1380-1440 DEG C, calcine 30-40 minute, pulverize, cross 40 mesh sieves, to obtain final product.

The preparation method of described cutting tool heat-stable ceramic, is characterized in that comprising the following steps:

(1) by zirconium white, silicon nitride, boron nitride mixing, ball milling, crosses 325 mesh sieves, obtains particle;

(2) by Al2O3, CaO, black silicon carbide, magnesium oxide mixing, ball milling, crosses 300 mesh sieves, obtains particle;

(3) zirconium phosphate, potassium humate are mixed with the particle that first two steps obtain, add the ethanol of the deionized water of 20-25% weight part, 3-5% weight part, be mixed into pureed, send into ball milling 2-3 in ball mill individual hour, dry, send in calcining furnace, 1-2 hour is calcined at 800-900 DEG C, take out and pulverize, cross 300 mesh sieves, obtain particle;

(4) particle that (3) step obtains is mixed with other remaining components, add the deionized water of 3-4 times of weight part, polyoxyethylene glycol, ball milling 2-3 hour, dry at 110-120 DEG C, cross 40 mesh sieves, hot pressing at 1580-1640 DEG C, hot pressing pressure is 20-30MPa, hot pressing time is 50-60 minute, to obtain final product.

Beneficial effect of the present invention

Ceramic abrasive resistance of the present invention is good, and by adding black silicon carbide, zirconium phosphate, magnesium oxide, considerably increase wear resistance, the thermal conductivity of pottery, extend cutting-tool's used life, this ceramic cost is low; The antiwear assistant of the application of the invention, can increase the surface smoothness of pottery, wear resistance and thermotolerance.

Embodiment

A kind of cutting tool heat-stable ceramic, is made up of the raw material of following weight part (kilogram): Al2O3 18, CaO20, zirconium white 22, silicon nitride 33, boron nitride 28, black silicon carbide 11, zirconium phosphate 2.5, magnesium oxide 3.5, polyoxyethylene glycol 1.2, appropriate amount of ethanol, potassium humate 1.1, deionized water are appropriate, polyoxyethylene glycol 1.8, antiwear assistant 3.5;

Described antiwear assistant is made up of the raw material of following weight part (kilogram): silicon nitride 1.2, aluminium nitride 1.2, titanium nitride 1.2, carbonitride 0.6, zirconium white 1.5, bortz powder 1.5, hafnia 0.3, silane coupling agent kh-550 1.5, nitrogenize silver 0.8, silicon carbide 1.5, polyacrylic ester 0.5, ethanol 7, water 9; Preparation method is: ethanol, polyacrylic ester, silane coupling agent kh-550 are added to the water, stir, then add zirconium white, silicon carbide, be heated to 75 DEG C, stirring reaction 25 minutes, then add other remaining components, stir 15 clocks, ultrasonic disperse 7 minutes, filter, dry, pulverize, cross 40 mesh sieves, under nitrogen atmosphere, calcine 35 minutes at 1420 DEG C, pulverize, cross 40 mesh sieves, to obtain final product.

The preparation method of described cutting tool heat-stable ceramic, comprises the following steps:

(1) by zirconium white, silicon nitride, boron nitride mixing, ball milling, crosses 325 mesh sieves, obtains particle;

(2) by Al2O3, CaO, black silicon carbide, magnesium oxide mixing, ball milling, crosses 300 mesh sieves, obtains particle;

(3) zirconium phosphate, potassium humate are mixed with the particle that first two steps obtain, add the ethanol of the deionized water of 23% weight part, 4% weight part, be mixed into pureed, in feeding ball mill, ball milling 2.5 hours, dry, sends in calcining furnace, calcine 1.5 hours at 840 DEG C, take out and pulverize, cross 300 mesh sieves, obtain particle;

(4) particle that (3) step obtains is mixed with other remaining components, add the deionized water of 3 times of weight parts, polyoxyethylene glycol, ball milling 2.4 hours, dry at 114 DEG C, cross 40 mesh sieves, hot pressing at 1630 DEG C, hot pressing pressure is 25MPa, and hot pressing time is 55 minutes, to obtain final product.

Experimental data:

The Vickers' hardness of this embodiment pottery is 94GPa, and bending strength is 1028MPa, and fracture toughness property is 12MPam ^1/2.

Claims (2)

1. a cutting tool heat-stable ceramic, is characterized in that being made up of the raw material of following weight part: Al2O3 15-20, CaO18-22, zirconium white 20-24, silicon nitride 30-35, boron nitride 25-30, black silicon carbide 9-12, zirconium phosphate 2-3, magnesium oxide 3-4, polyoxyethylene glycol 1-1.3, appropriate amount of ethanol, potassium humate 1-1.3, deionized water are appropriate, polyoxyethylene glycol 1.7-2, antiwear assistant 3-4;

Described antiwear assistant is made up of the raw material of following weight part: silicon nitride 1-1.4, aluminium nitride 1-1.4, titanium nitride 1-1.3, carbonitride 0.4-0.7, zirconium white 1-2, bortz powder 1-2, hafnia 0.3-0.4, silane coupling agent kh-550 1-2, nitrogenize silver 0.7-0.9, silicon carbide 1-2, polyacrylic ester 0.4-0.6, ethanol 6-9, water 7-11; Preparation method is: ethanol, polyacrylic ester, silane coupling agent kh-550 are added to the water, stir, then add zirconium white, silicon carbide, be heated to 70-80 DEG C, stirring reaction 20-30 minute, then add other remaining components, stir 10-20 minute, ultrasonic disperse 6-8 minute, filter, dry, pulverize, cross 40 mesh sieves, under nitrogen atmosphere, at 1380-1440 DEG C, calcine 30-40 minute, pulverize, cross 40 mesh sieves, to obtain final product.

2. the preparation method of cutting tool heat-stable ceramic according to claim 1, is characterized in that comprising the following steps:

(1) by zirconium white, silicon nitride, boron nitride mixing, ball milling, crosses 325 mesh sieves, obtains particle;

(2) by Al2O3, CaO, black silicon carbide, magnesium oxide mixing, ball milling, crosses 300 mesh sieves, obtains particle;

(3) zirconium phosphate, potassium humate are mixed with the particle that first two steps obtain, add the ethanol of the deionized water of 20-25% weight part, 3-5% weight part, be mixed into pureed, send into ball milling 2-3 in ball mill individual hour, dry, send in calcining furnace, 1-2 hour is calcined at 800-900 DEG C, take out and pulverize, cross 300 mesh sieves, obtain particle;

(4) particle that (3) step obtains is mixed with other remaining components, add the deionized water of 3-4 times of weight part, polyoxyethylene glycol, ball milling 2-3 hour, dry at 110-120 DEG C, cross 40 mesh sieves, hot pressing at 1580-1640 DEG C, hot pressing pressure is 20-30MPa, hot pressing time is 50-60 minute, to obtain final product.