Bearing ball made of cermet

A technology of cermets and bearing balls, applied in the field of bearing balls, which can solve the problems of low bearing capacity, low density of silicon nitride ceramic balls, and difficult manufacturing and processing

Inactive Publication Date: 2008-05-28
LUOYANG BEARING SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon nitride ceramic balls have low density, about 3.2g / cm 3 , high-speed performance, heat resistance, and corrosion resistance are good, but the load-carrying capacity is low, but the manufacturing process is difficult and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A bearing ball made of cermet is composed of 25% of nickel powder, 5% of molybdenum powder, and the balance of titanium nitrogen carbide powder.

[0024] I. Mixed granulation

[0025] Mix and granulate on a drum-type ball mill, the mixing medium is absolute ethanol, the ball-to-material ratio is 6:1, the mixing time is 48 hours, and the sieve is granulated to 40 mesh;

[0026] II. Forming

[0027] The compact is pressed with a steel mold on a hydraulic press, and the density of the compact is 2.5g / cm 3 ;Formed on a cold isostatic press, the cold isostatic pressure is 200MPa, and the time is 2min;

[0028] III. Sintering

[0029] It is sintered in an atmosphere pressure sintering furnace, the sintering temperature is 1450°C, the sintering time is 1.5h, and the atmosphere pressure is 3MPa.

Embodiment 2

[0031] A bearing ball made of cermet is composed of 15% of nickel powder and 15% of molybdenum powder; the balance is titanium nitride carbide powder.

[0032] I. Mixed granulation

[0033] Mix and granulate on a drum-type ball mill, the mixing medium is absolute ethanol, the ball-to-material ratio is 6:1, the mixing time is 48 hours, and the sieve is granulated to 40 mesh;

[0034] II. Forming

[0035] The compact is pressed with a steel mold on a hydraulic press, and the density of the compact is 3g / cm 3 ;Formed on a cold isostatic press, the cold isostatic pressure is 200MPa, and the time is 2min;

[0036] III. Sintering

[0037] It is sintered in an atmosphere pressure sintering furnace, the sintering temperature is 1400°C, the sintering time is 1h, and the atmosphere pressure is 1.5MPa.

Embodiment 3

[0039] A bearing ball made of cermet is composed of 20% of nickel powder, 10% of molybdenum powder, and the rest is titanium nitride carbide powder.

[0040] I. Mixed granulation

[0041] Mix and granulate on a drum-type ball mill, the mixing medium is absolute ethanol, the ball-to-material ratio is 6:1, the mixing time is 48 hours, and the sieve is granulated to 40 mesh;

[0042] II. Forming

[0043] The compact is pressed with a steel mold on a hydraulic press, and the density of the compact is 2.8g / cm 3 ;Formed on a cold isostatic press, the cold isostatic pressure is 200MPa, and the time is 2min;

[0044] III. Sintering

[0045] It is sintered in an atmosphere pressure sintering furnace, the sintering temperature is 1420°C, the sintering time is 1.5h, and the atmosphere pressure is 3MPa.

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Abstract

A bearing ball is made from ceramet with following weight percentages of nickel powder 15-25%, molybdenum powder 5-15%, and titanium carbide nitride powder as the rest. The process of the bearing ball comprises mixer-granulating raw powders on a tumbling ball mill by using absolute ethyl alcohol as mixing agent, adopting 6:1of ball-to-powder weight ratio, mixing powders for 48h, and granulating 40 meshes by rubbing a sieve, and then pressed green compacts on a hydraulic press through adopting a steel die with green compact density of 2.5-3.0g/cm3, shaping on a cool isostatic press with 200MPa of isostatic cool pressing pressure for 2 min, sintering on an atmosphere pressure sintering furnace with 1400-1450 DEG C of sintering temperature for 1-1.5h, using 1.5-3 MPa of the atmosphere pressure. The bearing ball which is made from ceramet is significantly superior to the traditional bearing steel material under the conditions with high speed, high temperature and corrosion, and is obviously superior to silicon nitride ceramics material in regard to manufacturing and processing costs and difficulty respect, which has spreading application space in operating modes with high speed, high temperature, corrosion and the like.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a bearing ball made of metal ceramics. Background technique [0002] Rolling bearing is a precision mechanical element that changes the sliding friction between the running shaft and the shaft seat into rolling friction, thereby reducing friction loss. Rolling bearings generally consist of inner rings, outer rings, rolling elements and cages. The function of the inner ring is to cooperate with the shaft and rotate together with the shaft; the outer ring cooperates with the bearing seat to play a supporting role; the cage can evenly distribute the rolling elements, prevent the rolling elements from falling off, guide the rolling elements to rotate and lubricate The rolling elements are evenly distributed between the inner ring and the outer ring by means of the cage, and their shape, size and quantity directly affect the performance and life of the rolling bearing. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C33/62F16C33/32B22F5/00B22F3/16
Inventor 张永乾李县辉陈志军孙永安徐中兴王利军张利娟
Owner LUOYANG BEARING SCI & TECH CO LTD
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