CN104550922A - Powder metallurgy material for high-finish-degree valve and preparation method of powder metallurgy material - Google Patents

Abstract

The invention relates to a powder metallurgy material for a high-finish-degree valve. The powder metallurgy material is made of the following raw materials in parts by weight: 1 to 1.5 parts of iron sulfide, 24 to 27 parts of titanium powder, 0.6 to 0.9 part of nano carbon fiber, 1 to 1.5 part of manganese, 3 to 4 parts of TiB2, 0.3 to 0.4 part of Ta, 0.8 to 1.1 parts of yttrium oxide, 6 to 8 parts of nano silicon dioxide, 0.3 to 0.4 part of silane coupling agent kh-550, appropriate amount of 1% sodium carbonate solution, appropriate amount of water, 2.5 to 3.5 parts of sodium hypophosphite, 0.4 to 0.6 part of polyethylene glycol, 30 to 35 parts of 2Mol/L copper sulfate solution, 2 to 3 parts of wetting additive and 60 to 64 parts of iron powder. According to the valve material, by adding the nano silicon dioxide, the compactness, strength, flexibility, hardness, elastic modulus and finish degree of the alloy can be improved, and the leakage of the valve can be prevented.

Description

A kind of best bright finish valve mmaterial and preparation method thereof

Technical field

The present invention relates to powder metallurgical technology, particularly relate to a kind of best bright finish valve mmaterial yttrium and preparation method thereof.

Background technology

Valve is in fluid system, is used for controlling the device of the direction of fluid, pressure, flow, is the medium in pipe arrangement and equipment (liquid, gas, powder) is flowed or stops and controlling the device of its flow.When the medium that valve passes through and operating mode different time have different requirements to valve material, have different requirements to the performance such as temperature tolerance, erosion resistance, intensity of material.The operating pressure of valve can ultra-high voltage from 0.0013MPa to 1000MPa, and working temperature is from the very low temperature of-270 DEG C to the high temperature of 1430 DEG C.

Valve material can make of mmaterial, but common iron powder powder metallurgy material is heat-resisting, erosion resistance is poor, and bearing is poor, and the mechanical properties such as intensity, hardness, shock-resistance are not high enough.In iron-base powder metallurgy material, add the nonmetallic phases such as porcelain powder, the thermotolerance of material, erosion resistance can be improved, improve hardness, improve oxidation-resistance, improve creep-resistant property.But due to nonmetallic phase and metallographic phase poor compatibility, easily make composition occur segregation, homogeneity of structure is poor, and intensity is uneven, occur piebald, running-in ability is poor, wears no resistance, and can not bear larger pressure, heat declines seriously, and cracking resistance can be poor, and thermal fatigue resistance can be poor, and work-ing life is short.

The performance of iron-base powder metallurgy material can be improved by feed change, the performance of material can also be improved by the consistency improving nonmetallic phase and metallographic phase.

Summary of the invention

The object of the present invention is to provide a kind of best bright finish valve mmaterial and preparation method thereof, this valve material has high compactness, intensity, toughness, hardness, Young's modulus and smooth finish, prevents valve leaks.

Technical scheme of the present invention is as follows:

A kind of best bright finish valve mmaterial, is characterized in that being made up of the raw material of following weight part: iron sulphide 1-1.5, titanium valve 24-27, carbon nano fiber 0.6-0.9, manganese 1-1.5, TiB2 3-4, Ta0.3-0.4, yttrium oxide 0.8-1.1, nano silicon 6-8, silane coupling agent kh-550 0.3-0.4,1% sodium carbonate solution is appropriate, water appropriate, inferior sodium phosphate 2.5-3.5, polyoxyethylene glycol 0.4-0.6,2Mol/L copper-bath 30-35, wetting aid 2-3, iron powder 60-64;

Described wetting aid is made up of the raw material of following weight part: K2ZrF6 1-2, V2O52-3, nanometer silver 0.8-1.4, TiN0.4-0.6, MoO3 3-4, nano mica powder 0.6-0.9, water 8-10, polyoxyethylene glycol 0.1-0.2; Preparation method is: be added to the water by polyoxyethylene glycol, nanometer silver is added after stirring, stir 20-30 minute, ultrasonic disperse 3-4 minute, then add other remaining component, 10-15 minute is stirred under 7000-8000 rev/min, ultrasonic disperse 4-5 minute, is stirred to over dry in 120-130 DEG C of oil bath, pulverizes, cross 80 mesh sieves, to obtain final product.

The preparation method of described best bright finish valve mmaterial, is characterized in that comprising the following steps:

(1) by iron sulphide, carbon nano fiber, TiB2, yttrium oxide, nano silicon mixing, add in 1% sodium carbonate solution of 3-4 times of weight part, be heated to 40-50 DEG C, stir 10-15 minute, filter, add the water washing of 3-4 times of weight part, repeated washing 2-3 time, filters, obtains filter cake;

(2) mixed with wetting aid by filter cake, grinding 30-40 minute, adds the water of 4-5 times of weight part, add silane coupling agent kh-550, stir 10-15 minute, be heated to 60-70 DEG C, then add the iron powder of titanium valve, 0.6-0.8 weight part, stir 30-40 minute, filter, spraying dry under an atmosphere of hydrogen, pulverize, cross 130 mesh sieves, obtain powder;

(3) powder that (2) step obtains is added in 2Mol/L copper-bath, add polyoxyethylene glycol, inferior sodium phosphate, be heated to 60-70 DEG C, stirring reaction 1-2 hour, filter, be washed with water to neutrality, pass into hydrogen desiccation, pulverize, obtain powder;

(4) powder that (3) step obtains is mixed with other remaining components, ball milling, shaping, sintering, finished machined, to obtain final product.

Beneficial effect of the present invention

Valve material of the present invention, by adding nano silicon, improves the compactness of alloy, intensity, toughness, hardness, Young's modulus and smooth finish, prevents valve leaks.Manufacture craft of the present invention makes metallographic phase and nonmetallic phase mutually intert, and combines closely, and adds wettability and the cohesiveness of nonmetallic phase and metallographic phase, can prevent component segregation, makes material structure even, adds intensity and toughness; The wetting aid of the application of the invention, can increase the wettability of metal pair nonmetallic phase, increases fatigue strength and the toughness of valve.

Embodiment

A kind of best bright finish valve mmaterial, is made up of the raw material of following weight part (kilogram): iron sulphide 1.3, titanium valve 25, carbon nano fiber 0.8, manganese 1.3, TiB2 3.5, Ta0.3, yttrium oxide 1, nano silicon 7, silane coupling agent kh-550 0.3,1% sodium carbonate solution is appropriate, water appropriate, inferior sodium phosphate 3, polyoxyethylene glycol 0.5,2Mol/L copper-bath 33, wetting aid 2.5, iron powder 63;

Described wetting aid is made up of the raw material of following weight part (kilogram): K2ZrF6 1.5, V2O52.5, nanometer silver 1.1, TiN0.4-0.6, MoO3 3.5, nano mica powder 0.8, water 9, polyoxyethylene glycol 0.1; Preparation method is: be added to the water by polyoxyethylene glycol, adds nanometer silver after stirring, and stirs 25 minutes, ultrasonic disperse 3 minutes, add other remaining component again, stir 14 minutes under 7500 revs/min, ultrasonic disperse 5 minutes, is stirred to over dry in 125 DEG C of oil baths, pulverize, cross 80 mesh sieves, to obtain final product.

The preparation method of described best bright finish valve mmaterial, comprises the following steps:

(1) by iron sulphide, carbon nano fiber, TiB2, yttrium oxide, nano silicon mixing, add in 1% sodium carbonate solution of 3.5 times of weight parts, be heated to 45 DEG C, stir 13 minutes, filter, add the water washing of 3.5 times of weight parts, repeated washing 2 times, filters, obtains filter cake;

(2) filter cake is mixed with wetting aid, grind 35 minutes, add the water of 4.5 times of weight parts, add silane coupling agent kh-550, stir 13 minutes, be heated to 66 DEG C, then add the iron powder of titanium valve, 0.7 weight part, stir 35 minutes, filter, spraying dry under an atmosphere of hydrogen, pulverize, cross 130 mesh sieves, obtain powder;

(3) powder that (2) step obtains is added in 2Mol/L copper-bath, add polyoxyethylene glycol, inferior sodium phosphate, be heated to 65 DEG C, stirring reaction 1.5 hours, filter, be washed with water to neutrality, pass into hydrogen desiccation, pulverize, obtain powder;

(4) powder that (3) step obtains is mixed with other remaining components, ball milling, shaping, sintering, finished machined, to obtain final product.

Experimental data:

The hardness HB of this embodiment valve material is 65 after tested, and density is 94.37%, voidage 9.33%, and fracture toughness property is 13.6MPam ^1/2, ultimate compression strength is 151MPa, and bending strength is 498MPa.

Claims (2)

1. a best bright finish valve mmaterial, is characterized in that being made up of the raw material of following weight part: iron sulphide 1-1.5, titanium valve 24-27, carbon nano fiber 0.6-0.9, manganese 1-1.5, TiB2 3-4, Ta0.3-0.4, yttrium oxide 0.8-1.1, nano silicon 6-8, silane coupling agent kh-550 0.3-0.4,1% sodium carbonate solution are appropriate, water appropriate, inferior sodium phosphate 2.5-3.5, polyoxyethylene glycol 0.4-0.6,2Mol/L copper-bath 30-35, wetting aid 2-3, iron powder 60-64;

Described wetting aid is made up of the raw material of following weight part: K2ZrF6 1-2, V2O52-3, nanometer silver 0.8-1.4, TiN0.4-0.6, MoO3 3-4, nano mica powder 0.6-0.9, water 8-10, polyoxyethylene glycol 0.1-0.2; Preparation method is: be added to the water by polyoxyethylene glycol, nanometer silver is added after stirring, stir 20-30 minute, ultrasonic disperse 3-4 minute, then add other remaining component, 10-15 minute is stirred under 7000-8000 rev/min, ultrasonic disperse 4-5 minute, is stirred to over dry in 120-130 DEG C of oil bath, pulverizes, cross 80 mesh sieves, to obtain final product.

2. the preparation method of best bright finish valve mmaterial according to claim 1, is characterized in that comprising the following steps:

(1) by iron sulphide, carbon nano fiber, TiB2, yttrium oxide, nano silicon mixing, add in 1% sodium carbonate solution of 3-4 times of weight part, be heated to 40-50 DEG C, stir 10-15 minute, filter, add the water washing of 3-4 times of weight part, repeated washing 2-3 time, filters, obtains filter cake;

(2) mixed with wetting aid by filter cake, grinding 30-40 minute, adds the water of 4-5 times of weight part, add silane coupling agent kh-550, stir 10-15 minute, be heated to 60-70 DEG C, then add the iron powder of titanium valve, 0.6-0.8 weight part, stir 30-40 minute, filter, spraying dry under an atmosphere of hydrogen, pulverize, cross 130 mesh sieves, obtain powder;

(3) powder that (2) step obtains is added in 2Mol/L copper-bath, add polyoxyethylene glycol, inferior sodium phosphate, be heated to 60-70 DEG C, stirring reaction 1-2 hour, filter, be washed with water to neutrality, pass into hydrogen desiccation, pulverize, obtain powder;

(4) powder that (3) step obtains is mixed with other remaining components, ball milling, shaping, sintering, finished machined, to obtain final product.