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박원 로고

Product

PRIDE OF QUALITY PARKWON STEEL BALL

제품소개

Ceramic Ball

제품소개

세라믹(Si3N4)

고속, 고온, 전식 등의 특수환경 하에서 기존 고탄소 크롬베어링강(SUJ)의 열위점을 극복하기 위한 수단으로 전기자동차 및 경량화 베어링 범용 적용하기 위해 사용되는 재질입니다.

박원은 고객사로부터 승인된 HIP방식의 소결업체로 부터 Blank Ball을 공급받아 생산하고 있으며 현재는 완제품으로 글로벌 베어링사의 품질검증이 완료되어 Grade5 양산체제가 구축되었습니다.

세라믹 볼 사진
세라믹 볼 사진
세라믹 볼 사진

공정설명

공정설명
구분 세라믹 분말(Silicon Nitride Powder) Blank Ball(소결) Ball(완성품)
#01 #02 #03 #04 #05 #06 #07 #08
공정 3/16” ~ 1/2” 4,762 ~ 12.7mm 배합 몰딩
(제품형상화)		 가공 소결
(HIP : HOT Isotatic pressing)		 가공
(연마)		 검사

세라믹볼의 종류

세라믹볼의 종류
종류 구름베어링 적용 세라믹
특징 사용목적 적용처
Si3N4 고강도, 비자성, 내마모, 내식성 고하중 / 고속회전 용 베어링 터보차져, 스핀들, 모터엔진 등
ZrO2 고온저항성, 고강도, 내마모 고온용 베어링 가열로, 고온(가스터빈)용 부품류
ZrO2 산업용 펌프
AI2O3 유전체, 고강도, 내마모 전자 장치류 베어링 반도체 및 바이오(인체골격 등) 부품류

품질규격

Blank Ball 소재품질
Blank Ball 소재품질
Item Inspection Method Specification Inspection
Frequency *1, *2
1. Physical
Properties		 Elastic Modulus Bend Resonance Method 298 ~ 318 [GPa] n=1 / Material Intrinsic Value (not routinely measured)
c = 0
Poisson's ratio 0.28 ~ 0.30
Coefficient of Thermal Expansion Optical Interferometry 2.9 ~ 3.2 [x10-6/deg c]
Thermal Conductivity Laser Flash Method 18 ~ 25 [w/mk]
Constituent Phase*3 X-ray Diffraction Method Cu K α No residual alpha phase peak
2. Mechanical
Properties		 Density Archimedes's Method 3.22 ~ 3.26 [Mg/m3] n=5 / Manufacturing lot
c = 0
Hardness Vicker's Method 196, 1N - 30sec, (ASTM F 2094) 1400 ~ 1750 [HV] n=3 / Manufacturing lot
c = 0
Rupture Strength 3-point Bending Test (J|S R1601) Min.735 [MPa] n=20 / Material lot (powder lot)
Toughness |F Method 196, 1N - 30sec, (ASTM F 2094) 6 ~ 8 [MPa·m1/2] n=3 / Manufacturing lot
c = 0
3. Internal Defect *3*4 Metallograph x200 To not have following inside (cross section) of blanks
  1. Inclusions over average diameter of 15um (excluding sintering additive element)
  2. Voids over average diamante of 10um
  3. White or Black Color discoloration : Less than half of Grinding Allowance
 n=5 / Manufacturing lot * In case the shipment qty is 1kp or less, n=3 / Manufacturing lot
c = 0
4. Crack *3 Fluorescent Penetrant Test (Visual inspection under UV lamp after immersion to fluorescent penetrant washing and drying) No Crack One Hundred Percent Inspection
5. Appearance *3 Visual Check / Boundary Sample (Depth of chipping and height of protrusion on boundary sample will be produced by using depth of focus method of metallograph,)
  1. Chipping/dent : Depth of less than 0.15mm (Length and Width will be allowed)
  2. Protrusion : Height of less than 0.20mm (Length and Width will be allowed)
  3. Attachment of foreign particles : will be allowed
  4. Foreign substance on surface : will be allowed
  5. Roughing of surface : Same as chipping/protrusion
  6. Color unevenness : will be allowed
  7. Die Mark : Same as chipping/protrusion
 One Hundred Percent Inspection
6. Dimension Micrometer Equator Band Diameter (Diagonal diameter of equator band to be not subject of specification) Diameter variation 0.15mm (~3/8")
0.20mm (13/32" ~)
n=5 / Manufacturing lot
c = 0
  1. Material Lot
    Silicon Nitride powder lot that can assure uniformity of material characteristic
  2. Manufacturing Lot
    Dispatch lot that can assure uniformity of manufacturing record
  3. Report based on passing status judgement
  4. There are cases discoloration is observed after finishing, even though internal defect of inclusion or pore are not detected. This will be considered to be not a subject of defect.