Tiêu chuẩn iso 02478 1987 scan

The n mber of items e.g.. min pre s re d rin ma nufa cture if this dire tio is k own.

INTERNA TIONA L STANDARD

INT ER A T IONA L ORGA NIZA T ION FOR ST A NDA RDIZA T ION

Pro uits rgfracta ires fa o n&s d nses - D& termin tio d la v a ria tio p rma e te d

2478

19 7-1l-01

IS0 2 7 :19 7 (E)

IS0 (h Internatio al Organizatio fo r Standardizatio ) is a worldwid fe eratio of

me ta l a nd n n-g v ernme ta l, in laisn with ISO, als take p art in th work

R efactorie

0 Interna tiona l O rga niza tion for Sta nda rdiza tion, 19 7 0

Printe in Switz rla nd

Dense shaped refra c tory products - Determina tion of

refa c tory pro uc t It d e n t a pply to pro u ts c nta inin

ca rb on

o f bulk d n ity , a p pare t poro ity a nd tu p oro ity ‘)

ta nc te tin

d finitio s a p ply

p ro ut that is h ate to a spe ifie tempera ture for a spe ifie

time a nd th n c ole to ambie t temp era ture

4 Princ iple

Test pie e in th s a pe of rec tang la r prisms or c ln ers a re

c t fom ea ch bric or item, th n drie , a nd th ir ln ar dime -

at a pre cribe rate to a spe ifie tempera ture, whic is main-

is ca lc la te

5.1 F urna ce, eith r ele tic or gas-ire , ca pa ble of h atin

NOT - T he u e of a n elec tric furna ce is re om e d d, b ut a ga s-

c ntin o sly o idizin a nd th re is prov isio for mo itorin this c n i-

tio

re ord of th tempera ture is ob tain d

prefera b ly be a dial-gaug appa ra tu c n istin of a dial-gaug

sta nd whic has a srace-gro n ba se p late (ig re I), a nd a

tet pie e c arrier, as s own in fig re 2, with thre stu s to s p-

p or th te t pie e a nd two pin to loate it T he dime sio s of

s race of th carrier s all be gro n flat A dia go al mark s all

be in cribe at o e c rn r to e a b le a re tang lar te t pie e to

le gth s a ll be u e to c alibrate th d v ic

T he ca rrier s a ll be u e to s pp or a nd lo ate th te t pie e s

s race

1) At pre e t at th sta ge of draft

1

5.6 Drying o e , whic s a ll be fa n-a ssiste a nd s all ha v e

ope in s whic permit efic ie t ventiatio

The n mber of items (e.g bricks) to be tete s a ll be d ter

a gre d to by th intere te p artie

O ne te t pie e s a ll be take fom eac item (s e n te 1) Test

pie e s all be in th form of eith r

or

1 Wh re th siz of th item permits, more than o e te t pie e may

be take , a lth u h o e is p refere

min pre s re d rin ma nufa cture if this dire tio is k own

cln er, s a ll be gro n p la ne a nd p a rallel b efore th te t

E c te t pie e s a ll be id ntifie by a p p rop ria te ma rkin

Dry ea ch tet pie e in th dryin ov en (5.6) at 1 0 f 5 OC to

c on tant mas

o e c rn r with th dia go al mark o th c arrier, a nd mark this

c rn r s that th te t pie e may be pla ce in th same p ositio

Meas re th le gth of th tet pie e in fo r p ositio s, to a n a c-

ov er th ba se p late F or re ta ng la r te t p ie e , th fo r p osi-

n r For c ln rica l te t p ie e , th p ositio s a re IO to 15 m

IS0 5 17

C a lc la te th bulk v olume, V s, in c bic c ntimete , fom th

v , =

e

wh re

p ie e;

Q

is th d n ity , in grams per c bic c ntimete, of th im-

mersio lq id

c yln ers), a nd p rotec te fom direc t ra diatio in a n elec tric a lly

h a te furnace or fom th flame of th ga s b urn r in a ga s-

To a llow fe circ ula tio of th h t ga se , th te t pie e s a ll

furnac e

6 m thic k, of th same m eria l as th te t pie e, laid flat o

The te t tempera ture s a ll be 6 0 OC or a hig er tempera ture in

ra te :

a)

for te t tempera ture up to 1 2 0 OC :

te t tempera ture : betwe n 5 a nd 10 Y/min;

-

2

b) for test temp ratures a o e 1 2 0 ‘C :

-

-

-

NOT - F or the la st 5 ‘Y, ra tes of tempra ture inc rea se btwen

1 an 2 Y/min a re prefered

th rmocouples (5.2) to within + 10 “C of th test temp rature

NOT - I req ired, further tests may b ca rried out for priod of 12 h

or 2 h

Switch of th furn ce a d alow it to co l at its n tural rate,

Examin th test pieces, n ting p rtic ularly a y blsters or ac-

piece at e ch of th four p sitio s sp cifie in 7.2.1

u e in 7.2.2

(Meth d 2) Calc late th ch nge in th relev ant qua tity, A L

10 A L/ L, or 10 A V / V, For Meth d 1, c alc late th ch nge

in le gth for e ch me s ring p int

d cre ses as n gativ e ( - 1

c) a refere ce to this Intern tio al Sta d rd, ie “Deter-

typ , b tch numb r, etc );

u e ;

(se 7.10.1);

n gativ e) for e ch test piece a d e ch item

3

Dimen ion in mi metres

Detai of rou din -of of stu s,

pint of dia l-gau e an

loc atin pin

205

T hre

6

stu s V J D +- !)

-1

l

Fig re 2 - T est piece c arier

c

I

0

In

I

s

I

L

L

4

UDC 6 6.7 : 631.7 : 696.4

De criptors : refac tory materials, s a pe refa c torie , te ts, hig temperature te ts, dime sio al meas reme ts, dime sio s