Monday, August 27, 2007

Kromium www.tool-tool.com

Bewise Inc. www.tool-tool.com Reference source from the internet.

Dari Wikipedia Indonesia, ensiklopedia bebas berbahasa Indonesia.

Langsung ke: navigasi, cari
24 vanadiumkromiummangan
-

Cr

Mo

Keterangan Umum Unsur
Nama, Lambang, Nomor atom kromium, Cr, 24
Seri kimia logam transisi
Golongan, Periode, Blok 6, 4, d
Penampilan perak metalik
Massa atom 51.9961(6) g/mol
Konfigurasi elektron [Ar] 3d5 4s1
Jumlah elektron tiap kulit 2, 8, 13, 1
Ciri-ciri fisik
Fase solid
Massa jenis (sekitar suhu kamar) 7.15 g/cm³
Massa jenis cair pada titik lebur 6.3 g/cm³
Titik lebur 2180 K
(1907 °C, 3465 °F)
Titik didih 2944 K
(2671 °C, 4840 °F)
Kalor peleburan 21.0 kJ/mol
Kalor penguapan 339.5 kJ/mol
Kapasitas kalor (25 °C) 23.35 J/(mol·K)
Tekanan uap
P/Pa 1 10 100 1 k 10 k 100 k
pada T/K 1656 1807 1991 2223 2530 2942
Ciri-ciri atom
Struktur kristal cubic body centered
Bilangan oksidasi 6, 4, 3, 2
(strongly acidic oxide)
Elektronegativitas 1.66 (skala Pauling)
Energi ionisasi
(detil)
ke-1: 652.9 kJ/mol
ke-2: 1590.6 kJ/mol
ke-3: 2987 kJ/mol
Jari-jari atom 140 pm
Jari-jari atom (terhitung) 166 pm
Jari-jari kovalen 127 pm
Lain-lain
Sifat magnetik AFM (rather: SDW)
Resistivitas listrik (20 °C) 125 nΩ·m
Konduktivitas termal (300 K) 93.9 W/(m·K)
Ekspansi termal (25 °C) 4.9 µm/(m·K)
Kecepatan suara (pada wujud kawat) (20 °C) 5940 m/s
Modulus Young 279 GPa
Modulus rigiditas 115 GPa
Modulus ruah 160 GPa
Nisbah Poisson 0.21
Skala kekerasan Mohs 8.5
Kekerasan Vickers 1060 MPa
Kekerasan Brinell 1120 MPa
Nomor CAS 7440-47-3
Isotop
iso NA waktu paruh DM DE (MeV) DP
50Cr syn > 1.8×1017y εε - 50Ti
51Cr syn 27.7025 d ε - 51V
γ 0.320 -
52Cr 83.789% Cr stabil dengan 28 neutron
53Cr 9.501% Cr stabil dengan 29 neutron
54Cr 2.365% Cr stabil dengan 30 neutron
Referensi

Kromium adalah sebuah unsur kimia dalam tabel periodik yang memiliki lambang Cr dan nomor atom 24.

Kromium trivalen (Cr(III), atau Cr3+) diperlukan dalam jumlah kecil dalam metabolisme gula pada manusia. Kekurangan kromium trivalen dapat menyebabkan penyakit yang disebut penyakit kekurangan kromium (chromium deficiency).


BW Bewise Inc. Willy Chen willy@tool-tool.com bw@tool-tool.com www.tool-tool.com skype:willy_chen_bw mobile:0937-618-190 Head &Administration Office No.13,Shiang Shang 2nd St., West Chiu Taichung,Taiwan 40356 TEL:+886 4 24710048 / FAX:+886 4 2471 4839 N.Branch 5F,No.460,Fu Shin North Rd.,Taipei,Taiwan S.Branch No.24,Sec.1,Chia Pu East Rd.,Taipao City,Chiayi Hsien,Taiwan

Welcome to BW tool world! We are an experienced tool maker specialized in cutting tools. We focus on what you need and endeavor to research the best cutter to satisfy users demand. Our customers involve wide range of industries, like mold & die, aerospace, electronic, machinery, etc. We are professional expert in cutting field. We would like to solve every problem from you. Please feel free to contact us, its our pleasure to serve for you. BW product including: cutting toolaerospace tool .HSS Cutting toolCarbide end millsCarbide cutting toolNAS Cutting toolCarbide end millAerospace cutting toolФрезерыCarbide drillHigh speed steelMilling cutterCVDD(Chemical Vapor Deposition Diamond )PCBN (Polycrystalline Cubic Boron Nitride) Core drillTapered end millsCVD Diamond Tools Inserts’PCD Edge-Beveling Cutter(Golden Finger’PCD V-Cutter’PCD Wood tools’PCD Cutting tools’PCD Circular Saw Blade’PVDD End Mills’diamond tool Single Crystal Diamond Metric end millsMiniature end millsСпециальные режущие инструменты Пустотелое сверло Pilot reamerFraisesFresas con mango PCD (Polycrystalline diamond) FreseElectronics cutterStep drillMetal cutting sawDouble margin drillGun barrelAngle milling cutterCarbide burrsCarbide tipped cutterChamfering toolIC card engraving cutterSide cutterNAS toolDIN toolSpecial toolMetal slitting sawsShell end millsSide and face milling cuttersSide chip clearance sawsLong end millsStub roughing end millsDovetail milling cuttersCarbide slot drillsCarbide torus cuttersAngel carbide end millsCarbide torus cuttersCarbide ball-nosed slot drillsMould cutterTool manufacturer.

Bewise Inc. www.tool-tool.com

BW специализируется в научных исследованиях и разработках, и снабжаем самым высокотехнологичным карбидовым материалом для поставки режущих / фрезеровочных инструментов для почвы, воздушного пространства и электронной индустрии. В нашу основную продукцию входит твердый карбид / быстрорежущая сталь, а также двигатели, микроэлектрические дрели, IC картонорезальные машины, фрезы для гравирования, режущие пилы, фрезеры-расширители, фрезеры-расширители с резцом, дрели, резаки форм для шлицевого вала / звездочки роликовой цепи, и специальные нано инструменты. Пожалуйста, посетите сайт www.tool-tool.com для получения большей информации.

BW is specialized in R&D and sourcing the most advanced carbide material with high-tech coating to supply cutting / milling tool for mould & die, aero space and electronic industry. Our main products include solid carbide / HSS end mills, micro electronic drill, IC card cutter, engraving cutter, shell end mills, cutting saw, reamer, thread reamer, leading drill, involute gear cutter for spur wheel, rack and worm milling cutter, thread milling cutter, form cutters for spline shaft/roller chain sprocket, and special tool, with nano grade. Please visit our web www.tool-tool.com for more info.

No comments: