CN104387101A - Silicon carbide whisker reinforced ceramic for cutting tools and preparation method thereof - Google Patents

Abstract

The invention relates to a silicon carbide whisker reinforced ceramic for cutting tools, which is prepared from the following raw materials in parts by weight: 9-12 parts of calcite, 4-5 parts of magnesium oxide, 7-9 parts of quartz, 65-70 parts of zirconia, 18-25 parts of Si3N4, 5-7 parts of La2O3, 20-30 parts of silicon carbide whisker, 4-6 parts of lithium porcelain stone, 1-2 parts of sodium carbonate, 0.6-0.9 part of silane coupling agent KH-550, a right amount of ethanol, a right amount of deionized water, 1-1.5 parts of polyacrylic acid, 1.2-1.6 parts of polyethyleneglycol and 4-5 parts of antiwear assistant. By adding the silicon carbide whisker and La2O3, the ceramic has superhigh hardness, higher toughness, higher conductivity, wear resistance and high temperature resistance. The cutting tool made of the ceramic has the advantages of favorable heat resistance, smooth cut workpiece and long service life. The antiwear assistant can enhance the wear resistance and heat resistance of the ceramic.

Description

A kind of cutting tool silicon carbide whisker reinforced 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 silicon carbide whisker reinforced ceramic and preparation method thereof.

Background technology

Along with the development of new technology revolution, require the development improving constantly machining productivity and reduce production cost, particularly numerically-controlled machine, require the new-type cutter that exploitation is higher than inserted tool cutting speed, more wear-resisting.A few days ago various high strength, high rigidity, corrosion-resistant, wear-resisting and resistant to elevated temperatures be difficult to cut novel material increasing.Estimate according to document, this kind of material oneself account for and process more than 50% of sum in the world., inserted tool to the difficult processing of wherein many novel materials with competent.On the other hand, now in the world Wimet output oneself reach 20000-25 000 t.The metal that annual consumption is a large amount of, as W, Co, Ta and Nb etc.The Mineral resources of these metals reduce just day by day, price increase, press spending rate a few days ago, have more than is needed decades. and some resource will exhaust.Sintex is exactly grow up in this context.

Current sintex is the most extensive with ceramic applications such as zirconia ceramics, aluminum oxide, aluminium nitride, there is 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 is good, but these ceramic costs are high, also need the material that research is new further, reduce costs, also will improve the performances such as ceramics toughness, thermal diffusivity, heat-shock resistance, resistance to abrasion, to adapt to the technical requirements of development.

Summary of the invention

The object of the present invention is to provide a kind of cutting tool silicon carbide whisker reinforced ceramic and preparation method thereof, this pottery has high hardness, better toughness and conductivity, wear-resistant, resistance to elevated temperatures, this pottery is for making cutting tool, good heat resistance, cutting workpiece is smooth, and cutter life is long.

Technical scheme of the present invention is as follows:

A kind of cutting tool silicon carbide whisker reinforced ceramic, is characterized in that being made up of the raw material of following weight part: calcite 9-12, magnesium oxide 4-5, quartzy 7-9, zirconium white 65-70, Si3N4 18-25, La2O3 5-7, silicon carbide whisker 20-30, lithium porcelain stone 4-6, sodium carbonate 1-2, silane coupling agent kh-550 0.6-0.9, appropriate amount of ethanol, deionized water are appropriate, polyacrylic acid 1-1.5, polyoxyethylene glycol 1.2-1.6, wear-resistant auxiliary agent 4-5;

Described wear-resistant auxiliary agent is made up of the raw material of following weight part: magnesium borate crystal whisker 1.3-1.5, boric acid ester coupler 0.2-0.4, butter of antimony 0.3-0.5, urea 0.4-0.5, aluminium borate whisker 0.8-1.2, nano micro crystal cellulose 0.2-0.4, Y2Si2O7 whisker 1-2, stannic oxide 0.2-0.3, nano-graphite 0.4-0.8,1-2% hydrochloric acid soln is appropriate, water is appropriate, preparation method is: by butter of antimony, urea, nano micro crystal cellulose, stannic oxide adds in the water of 8-10 weight part, magnetic agitation 20-25 minute, add magnesium borate crystal whisker, aluminium borate whisker, Y2Si2O7 whisker continues to stir 2-3 hour, add boric acid ester coupler again, be heated to 70-80 DEG C, stirring reaction 20-30 minute, add nano-graphite again, stir 20-30 minute, drying is stirred in 120-130 DEG C of oil bath, send into calcining furnace, in nitrogen atmosphere, 50-60 minute is calcined at 700-800 DEG C, the 1-2% hydrochloric acid soln adding 2-3 times of weight part washs 2-3 time, be washed to neutrality, dry, pulverize, cross 40 mesh sieves, obtain.

The preparation method of described cutting tool silicon carbide whisker reinforced ceramic, is characterized in that comprising the following steps:

(1) by ball milling after lithium porcelain stone, calcite mixing, cross 250 mesh sieves, add the water of 4-5 times of weight part, add silane coupling agent kh-550 after stirring, be heated to 70-80 DEG C, stir 10-15 minute, add La2O3, magnesium oxide, sodium carbonate again, continue to stir 30-40 minute, spraying dry, obtain particle, then send in calcining furnace, in nitrogen atmosphere, 40-50 minute is calcined at 700-800 DEG C, pulverize, cross 200 mesh sieves, obtain particle;

(2) by quartz, zirconium white, Si3N4 mixing, add the ethanol of 0.8-1 times of weight part, be milled to below 200 orders, dry, obtain particle;

(3) particle first two steps obtained mixes with other remaining components, get the deionized water of 3-4 times of weight part of mixing material, add polyacrylic acid, polyoxyethylene glycol, stir, add mixing material, ball milling 1-2 hour, ultrasonic disperse 13-17 minute, dry at 110-120 DEG C, cross 40 mesh sieves, obtain particle;

(4) particle (3) step obtained is in nitrogen atmosphere, and hot pressing at 1610-1670 DEG C, hot pressing pressure is 25-30MPa, and hot pressing time is 40-50 minute, and naturally cooling, to obtain final product.

Beneficial effect of the present invention

Pottery of the present invention with the addition of silicon carbide whisker, La2O3, makes pottery have high hardness, better toughness and conductivity, wear-resistant, resistance to elevated temperatures, this pottery for making cutting tool, good heat resistance, cutting workpiece is smooth, and cutter life is long; The wear-resistant auxiliary agent of the application of the invention, can increase wear resistance and the thermotolerance of pottery.

Embodiment

A kind of cutting tool silicon carbide whisker reinforced ceramic, is made up of the raw material of following weight part (kilogram): calcite 11, magnesium oxide 4.5, quartz 8, zirconium white 68, Si3N4 22, La2O3 6, silicon carbide whisker 25, lithium porcelain stone 5, sodium carbonate 1.5, silane coupling agent kh-550 0.8, appropriate amount of ethanol, deionized water are appropriate, polyacrylic acid 1.3, polyoxyethylene glycol 1.4, wear-resistant auxiliary agent 4.5;

Described wear-resistant auxiliary agent is made up of the raw material of following weight part (kilogram): magnesium borate crystal whisker 1.4, boric acid ester coupler 0.3, butter of antimony 0.4, urea 0.4, aluminium borate whisker 1, nano micro crystal cellulose 0.3, Y2Si2O7 whisker 1.5, stannic oxide 0.3, nano-graphite 0.6,1.5% hydrochloric acid soln is appropriate, water is appropriate, preparation method is: by butter of antimony, urea, nano micro crystal cellulose, stannic oxide adds in the water of 9 weight parts, magnetic agitation 23 minutes, add magnesium borate crystal whisker, aluminium borate whisker, Y2Si2O7 whisker continues stirring 2.5 hours, add boric acid ester coupler again, be heated to 75 DEG C, stirring reaction 25 minutes, add nano-graphite again, stir 25 minutes, drying is stirred in 125 DEG C of oil baths, send into calcining furnace, in nitrogen atmosphere, calcine 55 minutes at 750 DEG C, 1.5% hydrochloric acid soln adding 2.5 times of weight parts washs 2.5 times, be washed to neutrality, dry, pulverize, cross 40 mesh sieves, obtain.

The preparation method of described cutting tool silicon carbide whisker reinforced ceramic, comprises the following steps:

(1) by ball milling after lithium porcelain stone, calcite mixing, cross 250 mesh sieves, add the water of 4.5 times of weight parts, add silane coupling agent kh-550 after stirring, be heated to 75 DEG C, stir 13 minutes, add La2O3, magnesium oxide, sodium carbonate again, continue stirring 35 minutes, spraying dry, obtain particle, then send in calcining furnace, in nitrogen atmosphere, calcine 45 minutes at 750 DEG C, pulverize, cross 200 mesh sieves, obtain particle;

(2) by quartz, zirconium white, Si3N4 mixing, add the ethanol of 0.9 times of weight part, be milled to below 200 orders, dry, obtain particle;

(3) particle first two steps obtained mixes with other remaining components, get the deionized water of 3.5 times of weight parts of mixing material, add polyacrylic acid, polyoxyethylene glycol, stir, add mixing material, ball milling 1.5 hours, ultrasonic disperse 15 minutes, dry at 115 DEG C, cross 40 mesh sieves, obtain particle;

(4) particle (3) step obtained is in nitrogen atmosphere, and hot pressing at 1650 DEG C, hot pressing pressure is 27MPa, and hot pressing time is 45 minutes, and naturally cooling, to obtain final product.

Experimental data:

The Vickers' hardness of this embodiment pottery is 101GPa, and bending strength is 1238MPa, and fracture toughness property is 15MPam ^1/2.

Claims (2)

1. a cutting tool silicon carbide whisker reinforced ceramic, is characterized in that being made up of the raw material of following weight part: calcite 9-12, magnesium oxide 4-5, quartzy 7-9, zirconium white 65-70, Si3N4 18-25, La2O3 5-7, silicon carbide whisker 20-30, lithium porcelain stone 4-6, sodium carbonate 1-2, silane coupling agent kh-550 0.6-0.9, appropriate amount of ethanol, deionized water are appropriate, polyacrylic acid 1-1.5, polyoxyethylene glycol 1.2-1.6, wear-resistant auxiliary agent 4-5;

Described wear-resistant auxiliary agent is made up of the raw material of following weight part: magnesium borate crystal whisker 1.3-1.5, boric acid ester coupler 0.2-0.4, butter of antimony 0.3-0.5, urea 0.4-0.5, aluminium borate whisker 0.8-1.2, nano micro crystal cellulose 0.2-0.4, Y2Si2O7 whisker 1-2, stannic oxide 0.2-0.3, nano-graphite 0.4-0.8,1-2% hydrochloric acid soln is appropriate, water is appropriate, preparation method is: by butter of antimony, urea, nano micro crystal cellulose, stannic oxide adds in the water of 8-10 weight part, magnetic agitation 20-25 minute, add magnesium borate crystal whisker, aluminium borate whisker, Y2Si2O7 whisker continues to stir 2-3 hour, add boric acid ester coupler again, be heated to 70-80 DEG C, stirring reaction 20-30 minute, add nano-graphite again, stir 20-30 minute, drying is stirred in 120-130 DEG C of oil bath, send into calcining furnace, in nitrogen atmosphere, 50-60 minute is calcined at 700-800 DEG C, the 1-2% hydrochloric acid soln adding 2-3 times of weight part washs 2-3 time, be washed to neutrality, dry, pulverize, cross 40 mesh sieves, obtain.

2. the preparation method of cutting tool silicon carbide whisker reinforced ceramic according to claim 1, is characterized in that comprising the following steps:

(1) by ball milling after lithium porcelain stone, calcite mixing, cross 250 mesh sieves, add the water of 4-5 times of weight part, add silane coupling agent kh-550 after stirring, be heated to 70-80 DEG C, stir 10-15 minute, add La2O3, magnesium oxide, sodium carbonate again, continue to stir 30-40 minute, spraying dry, obtain particle, then send in calcining furnace, in nitrogen atmosphere, 40-50 minute is calcined at 700-800 DEG C, pulverize, cross 200 mesh sieves, obtain particle;

(2) by quartz, zirconium white, Si3N4 mixing, add the ethanol of 0.8-1 times of weight part, be milled to below 200 orders, dry, obtain particle;

(3) particle first two steps obtained mixes with other remaining components, get the deionized water of 3-4 times of weight part of mixing material, add polyacrylic acid, polyoxyethylene glycol, stir, add mixing material, ball milling 1-2 hour, ultrasonic disperse 13-17 minute, dry at 110-120 DEG C, cross 40 mesh sieves, obtain particle;

(4) particle (3) step obtained is in nitrogen atmosphere, and hot pressing at 1610-1670 DEG C, hot pressing pressure is 25-30MPa, and hot pressing time is 40-50 minute, and naturally cooling, to obtain final product.